cpu module has several models

NA200plus, is a set of three 16-point type CPU module. Three models were CPUplus-1601, CPUplus-1602 and CPUplus-1601N. New plc input output modules fully meet the functional requirements of the mechanical industry users, in the case of small volume only conventional CPU 1/4, still have high-speed counting, speed pulse and other advanced features, plc module at the same time carefully for the ease of use of the service user, reflecting Nanda proud extension of the R & D team carved, excellence rigor; the high cost to the customer selection process more "conscious" of demanding to leave the choice.
, Plus fully reflects our pursuit of value for money concept. Please keep in mind, plus does not mean increasingly greater volume, price has become increasingly more expensive; but in a small volume can be increased more performance, low price better add value. We gave up minir named, because we need to have more product content, product customers can bring more imagination. Named plus, well reflect our intentions. I believe and plus mini contrast, can give our customers even more impressed.

usefulness plc modules

plc is useful for device control, device control have device start condition (input) and and control results (output), only with external switch-off input plc's input through plc logic operation to get results, then through the output terminal to control the external relays and other components to control the boot device, stop and so on.
LC sub cpu module, and expansion modules. When the terminal is not enough that you CPU module when necessary to increase the input module plc.

the role of input and output modules plc

plc input module for receiving, various parameters of the production process. put module(Start and stop input)
plc output module is used to send PLC operation after information received and completed by various control industrial field outside the machine actuators. (The result of using the output) If the digital module is the input and output signals of some switch, if it is analog module, that is an analog output signal of the.
1. A good anti-jamming capability.
2. to meet the matching requirements of various types of industrial field signals.

plc IO module de classification

Switch means only on and off (or 1 and 0) signals, analog io module two states means that changes continuously. IO commonly classified as follows: switch: by voltage level points, 220VAC, 110VAC, 24VDC, by way of sub isolation, with relay isolation and transistor isolation. Analog: divided by signal type, there is a current type (4-20mA0-20mA), voltage type (0-10V0-5V-10-10V), etc., according to the accuracy of points, there 12bit14bit16bit like. In addition to the general purpose IO, there are special IO module plc, such as thermal resistance, thermocouple, pulse and other modules. The number of points determined by IO module specification and quantity, IO module can be more or less, but the maximum number of CPU capacity can be managed by the basic configuration, namely by the maximum floor or rack slot limit.

The PLC IO module describes

Interface PLC and the electrical circuit is output through the input section (IO) completed. plc IO module integrates the PLC IO circuit, the input registers reflect the state of the input signal, output point to reflect the state of the output latch. The input module signals into the electrical signals into digital PLC system, the opposite output module. IO into digital input (DI), switching output (DO), the analog input (AI), analog output module. Modular PLC including the cpu module, I / O modules, memory, power supply modules, backplane or rack, these modules can be configured according to certain rules of combination.

Defined PLC controller

programmable logic controller initially only circuit logic control function, so named as a programmable logic controller, and later with the continuous development of these original functions have simple computer module including logic control, timing control, analog control , multi-machine communications, and many other features, the name was changed to the plc controller. PLC controller mainly refers to digital computing operation of the electronic system programmable logic controller for controlling the mechanical production process.

plc digital input output modulePLC

We know that the plc digital input output module in order to prevent interference generated by external circuit (such as voltage spikes, noise interference, etc.) caused by non-work PLC's even a damage to components, the general digital input module side are used optocoupler to cut off the internal circuit and the external circuit electrically PLC, to ensure the normal operation of the PLC. And in the input line has a RC filter circuit to prevent false signals due to the input jitter or pulse caused by external interference

Function output module

Programmable Output Module connected to the bus loop controller can be installed in the vicinity of the control device can also be installed in the floor inside the terminal module. Electronic writing code, you can live encoding. analog output module output control logic can be completed according to project conditions Ji programming. When the controller receives the alarm signal to the detector, based on pre-programmed into the program, the controller by bus linkage control signal to the output module, the output module startup requires the linkage of fire-fighting equipment; equipment operation after receiving a signal will be answered.

Programmable Controllers and IO Modules What are the similarities and different

programmable logic controller, ie PLC, can be considered a microcontroller or CPU + interface circuitry. Under normal circumstances, the microcontroller, CPU, including the IO module plc are just low-level output signal of a weak signal, you want to direct drive packed load is generally not possible, because their output current is too small, but because the PLC plus the interface circuit, you can put a weak signal amplification signal can directly drive high current take-load, general load current can be achieved PLC 1A.

plc What is the role of the power module

plc generally have small internal switching power supply, the output voltage is used for their own chips, components and external sensor power supply module , a large current can also give small executive power components, such as solenoid valve relays, etc.
plc cpu host power supply is limited, if you add the expansion unit, or peripheral unit. When using host power beyond its rated value, then you need the power module.

Input Output Module works

plc digital output (hereinafter referred to as modules), for switching bus system fire radio systems and fire radio broadcasts normally between. Output module is embedded microprocessor, microprocessor and fire alarm controller communications, power bus brownout detect, input and output line fault detection, output control, digital input module signal logic state judge, the status indicator control. Module after receiving the fire alarm control start command, pull the relay, the scene shifted from the normal speakers to fire radio broadcasts, and light indicator, while the answer signal information to the fire alarm controller, indicating that the switch was successful

Modules include what kinds of

 plc module should include IO modules (analog and digital input and output modules), cpu module, communications module, the general PLC does not require power modules, such as S7-200, while others require a power supply module PLC, such as S7-300 . According to the actual needs of the PLC module combination, such as CPU + DIC) + AI (analog input) + DO (digital output) + AO (analog output) + CP (communication module), if necessary, together with the PS (power supply module) basically able to achieve the desired purpose.

plc IO module

Interface PLC and the electrical circuit is output through the input section (I / O) to complete. plc IO module integrates the PLC's I / O circuit, the input register reflecting the input signal, the output point to reflect the state of the output latch. Input module into the electric signal into a digital signal the PLC system, the opposite output module. I / O into the digital input (DI), switching plc analog input output module, the analog input (AI), analog output (AO) modules.

Programmable Logic Controller (PLC) hardware measures:

The main modules are used large-scale or large scale integrated circuits, a large number of switching operations performed by non-contact electronic memory, plc IO module system design have improved the channel protection and signal conditioning circuit.
① shield - to power transformers, CPU, programmers and other major components, the use of electrical conductivity, magnetic shielding material good, to prevent outside interference.
② filter - the power supply system and an input line filter in various forms, such as intelligent plc or π-type filter network to eliminate or suppress high frequency interference, but also weakened the interaction between the various modules.
③ power adjustment and protection - the core components of the microprocessor needed a + 5V supply, the use of multi-stage filter and make adjustments with the integrated voltage regulator to adapt to fluctuations in the exchange and over-grid voltage, under influence of voltage.
④ isolation - between the microprocessor and I / O circuits, opto-isolated, effectively isolate the electrical connection between the I / O interface with the CPU contact, reducing failures and malfunctions; between the I / O port also isolated from each other.
⑤ with modular structure - This structure helps in case of failure to repair short. Once identified a faulty module can easily be replaced quickly, allowing the system to resume normal work; also helps to accelerate find the cause of the fault.

cpu module has several models

NA200plus, is a set of three 16-point type cpu module. Three models were CPUplus-1601, CPUplus-1602 and CPUplus-1601N. New Plc logic controllers fully meet the functional requirements of the mechanical industry users, in the case of small volume only conventional CPU 1/4, still have high-speed counting, speed pulse and other advanced features, at the same time carefully for the ease of use of the service user, reflecting Nanda proud extension of the R & D team carved, excellence rigor; the high cost to the customer selection process more "conscious" of demanding to leave the choice.
, Plus fully reflects our pursuit of value for money concept. Please keep in mind, plus does not mean increasingly greater volume, price has become increasingly more expensive; but in a small volume can be increased more performance, low price better add value. We gave up minir named, because we need to have more product content, product customers can bring more imagination. Named plus, well reflect our intentions. I believe and plus mini contrast, can give our customers even more impressed.

Large programmable control system

Our large-scale control system can be adapted to the needs of the most demanding application projects. They provide a modular architecture and a variety of I / O and networking options. These powerful control solutions for all areas, including processing, security and sports, including providing world-class capabilities. Our large-scale programmable automation controller (PAC) and programmable logic controllers (digital output plc) designed for distributed control applications or host project design, with excellent reliability and performance.

Basic PLC operation

Process control can be simple and to what extent? We have a common household space heater.
Heater member sealed in a container, ease of system communications. This concept can be extended to a remote control home thermostat heater, communication distance of a few meters, usually voltage control.
Now, we are in this small, simple process control system to be expanded on the basis of which the control and configure a plant need?
Long-distance transmission line impedance, EMI and RFI voltage control scheme makes implementation very difficult, in this case, the current loop is a simple and effective solution. Kirchhoff's law by the current loop current loop at any point is equal to all other points in the current, which can offset the impact of the transmission line impedance. Because the loop impedance and bandwidth (a few hundred ohms and "100Hz), EMI and RFI spurious pickup issues are minimized. plc analog input output module system is useful for properly controlling such a factory production system.

What is the definition of PLC, programmable logic controller

Programmable logic controller, said the English Programmable Controller, called PC. However, due to the personal computer PC is easy and (Personal Computer) confused, so people are still accustomed to using ethernet module plc programmable controller as an abbreviation. Electronic digital computing device operating system, it is a microprocessor core, specifically designed for applications in the industrial field, for it uses programmable memory for storage in its internal implementation of logical, sequential control, timer / counting and arithmetic operations such as operating instructions, and digital or analog input through output interface, control of all types of machinery or production processes. analog output plc is the product of computer technology with traditional relay contactor control technology, which overcomes the wiring relay contactor control system complex mechanical contact, low reliability, high power, versatility and flexibility shortcomings of the poor, full advantage of the microprocessor, and take care of operation and maintenance personnel to the site electrical skills and habits, especially PLC programming does not require specialized knowledge of computer programming languages, but with a set of relay ladder based simple instruction form, so that the image of the user programming, intuitive and easy to learn; debugging and troubleshooting is also very convenient. After the user to purchase the desired analog input plc, just follow the prompts manual, do a small amount of wiring and easy user programming work, it can flexibly and easily be applied to production practice PLC.

Medium programmable control system

Medium controller may provide the functionality and flexibility you need, do not have that kind of overhead systems, it is the perfect solution for medium-sized application projects. Select rack-based, modular package design standards and safety certification from the controller. Typical applications include complex machine plc digital input module, batch processing and building automation.

Micro & Nano programmable control system

Our micro and nano-plc industrial controller can provide an economical solution to meet the basic needs of a simple mechanical control, including relay replacement, and simple control timing and logic. The controller uses a compact package, integrated I / O and communication, and easy to use, ideal for conveyor automation, security systems and building and parking lot lighting applications projects.

Large programmable control system

Our large-scale control system can be adapted to the needs of the most demanding application projects. They provide a modular architecture and a variety of I / O and networking options. These powerful control solutions for all areas, including processing, security and sports, including providing world-class capabilities. Our large-scale programmable automation controller (PAC) and programmable logic controllers (digital input plc) designed for distributed control applications or host project design, with excellent reliability and performance.

PLC current loop transmission

Application of the current plc temperature control module loop is started in the early 1900s teletype, the earliest use of the 0-60mA loops and later changed to 0-20mA loop, PLC system is the first to use the 4-20mA loop.
4-20mA current loop has many advantages. Need to be carefully calculated in the traditional discrete component designs, and compared with the current integrated 4-20mAIC, circuit take up a lot of space.
Any current values ​​measured are representative of certain information. Practical applications, 4-20mA current loop in 0mA to 24mA current range. But 0mA to 4mA and 20mA to 24mA current range for diagnostics and system calibration. Due to lower than 4mA and above 20mA are used for diagnostics, it is believed readings between 0mA and 4mA could indicate a broken wire in the system. Similarly, between 20mA and 24mA between readings can indicate a potential short circuit occurred in the system.
Plus 4-20mA communications Highway Addressable Remote Sensor, which is backward compatible with 4-20mA instrumentation. In HART system uses microprocessor-based intelligent integration of field devices enables two-way communication. The HART protocol capable of carrying additional digital information on the same line 4-20mA analog current signal for process control.
PLC functions can be divided into several functional groups. Many plc IO module vendors will integrate these functions as separate modules, each module with features vary with the specific application. Many modules have multiple functions, it can interface with a variety of sensors. However, for specific applications will design special modules or expansion modules, such as in most cases: resistance temperature detector (RTD), sensor, or thermocouple sensor. In general, all modules have the same core functions: analog input, analog output, distributed control (eg fieldbus), interface, digital input and output (I / O), CPU and power supply.

Basic PLC operation

Plc logic controllers can be simple and to what extent? We have a common household space heater.
Heater member sealed in a container, ease of system communications. This concept can be extended to a remote control home thermostat heater, communication distance of a few meters, usually voltage control.
Now, we are in this small, simple process control system to be expanded on the basis of which the control and configure a plant need?
Long-distance transmission line impedance, EMI and RFI voltage control scheme makes implementation very difficult, in this case, the current loop is a simple and effective solution. Kirchhoff's law by the current loop current loop at any point is equal to all other points in the current, which can offset the impact of the transmission line impedance. Because the loop impedance and bandwidth (a few hundred ohms and "100Hz), EMI and RFI spurious pickup issues are minimized. digital output plc system is useful for properly controlling such a factory production system.

PLC basic instruction Overview

FX series plc temperature control module basic logic instructions 20 or 27, stepping instruction 2, features more than 100 instructions (different series vary).
FX2N plc intelligent controller a total of 27 basic logic instructions, which contains 20 basic logic instructions some sub-series PLC Programmable Logic Controller.
Instruction fetch and output instruction (LD / LDI / LDP / LDF / OUT)
(1) LD (instruction fetch) a normally open contact and left instruction bus connection, a normally open contact each logical row starting with this directive.
(2) LDI (negated instruction) a normally closed contact and left the bus connection instruction, a normally closed contact each logical row starting with this directive.
(3) LDP (transition instruction fetch) normally open contact with the left leading edge detection instruction bus connected only at the rising edge of the specified bit device is turned on when a scan cycle (from the OFF → ON).
(4) LDF (falling instruction fetch) normally closed contacts of falling edge detection instruction and left the bus connection.
(5) OUT (output command) coil for driving instruction, also known as output instruction.

Analog output module expansion

Here take a 12 bit analog output as an example, the design will use 12 bit D/A conversion chip MAX531 to realize the number of conversion. We then output the operational amplifier at MAX531, micro smart plc ,adjust the analog output to 0 ~ 5V, and output the hardware circuit of the output part as shown in Figure 3. Here, MAX531 is the 12 serial D/A, with a high conversion speed, MAX531 has internal reference voltage, both 10# pin (REFOUT) is 2.048V, so the full range of D/A conversion is 2.048V. And the output signal is a standard 0 ~ 5V, plc input output modules ,therefore, to a level of operational amplifier to max531 output 0 ~ 2.048v signals into 0 ~ 5V signal.

Analog sampling values transfer

MAX187 has an internal reference voltage, both 4 # pin (REF) is 4.096V, therefore, compact plc ,A / D conversion of the full range of 4.096V. The input signal is 0 ~ 5V, therefore, to add an op amp to 0 ~ 5V 0 ~ 4.096V after converted into MAX187. AT89C52 the P1.3 and chip select (CS) MAX187 connected, AT89C52 the P1.4 terminal and serial clock signal (SCLK) MAX187 is connected to the serial data output of AT89C52 the P1.5 and MAX187 (DOUT) connected. Value stored in the microcontroller memory analog sampling, plc analog input module and then by the microcontroller serial port to send to the PLC. A / D conversion of the C51 program is as follows,

#include
#include
sbit IC4_S = P1 ^ 4;
/ * AD input port settings * / sbit IC4_D = P1 ^ 5;
sbit IC4_C = P1 ^ 3;
void input (void)
{Unsigned char idata i;
unsigned int idata result = 0x0000;
IC4_C = 0;
/ * CS terminal is low * / for (i = 0; i <12; i ++)
{Result = result << 1;
  IC4_S = 0; / * clock terminal generates a clock pulse * /
IC4_S = 1;
if (IC4_D) result ++;
  / * Read from the serial data output of the A / D conversion data * /}
  IC4_C = 1; / * CS side is high * / pdat [1] = result;}

Analog input module expansion

Here take a 12 bit analog input as an example, analog signal to 0 ~ 5V standard voltage form into the signal input, plc digital input application 12 bit MAX187 conversion chip A/D realize analog conversion.

MAX187 is the 12 serial A/D, with a high conversion speed, the sampling frequency is 75kHz, input module plc and it is suitable for the process control of higher precision.

Taking into account the high frequency interference in the real industrial scene, the low-pass filter is used before the sampling signal MAX187.

PLC analog output module with low cost expansion

Programmable controller (hereinafter referred to as PLC) due to the high reliability, simple programming, strong versatility, small size, compact structure, installation, plc analog output module maintenance is convenient wait for a characteristic, and in industrial control has been widely used. General PLC module for the following categories, switch quantity input module, switch module output, analog input module and analog output module.

In the industrial control especially process control in the field of analog acquisition and control needs to be more, more and need of PLC Analog input and output module, and analog input and output module is more expensive and increase the analog input and output module increases the cost and reduce the price of the entire system, limit the application of PLC. This paper presents a method of extended analog input output module,  high-speed counter modules communication based on trying to solve this problem.

The role of the PLC input and output module

PLC input module is used for receiving, the various parameters of production process. (start stop input) output module plc  ,input module plc

The PLC output module is used to send can be obtained after computing the controller programming information, programmable logic controller manufacturer  and implementing agencies through the outside to complete all kinds of industrial field control. (the output)

1, have good anti disturbance ability.
2, can meet the requirements of all kinds of industry scene signal

PLC IO module and the electrical circuit

The pace of work from the vibration signal control. The operation is used for digital or logic operation, under the command of the controller work. Register to participate in operations, input module plc and to store intermediate results of operations, it is under the command of the controller.

CPU speed and memory capacity of PLC is an important parameter, which determines the pace of work PLC, IO number and software capacity, limiting the size of control.

PLC and the electrical circuit is through the input and output interface, complete the part (I/O). The IO module plc  integrated circuit PLC, the input registers to reflect the state of the input signal, the output reflects the state of the output latch.

PLC IO Modules

In 2010 and 2011, after years of double-digit growth of the recession, I / O module market started to recover, especially programmable controller module plc. However, the recovery of a distributed control system (DCS) I / O bit slow marketI / O
Modules, most of which is used with the controller, is an important part of complex industrial automation systems. By adding more IO module plc, the scope and flexibility of the entire automated system can be improved. PLC, for example, can move towards their ability to control the field level to increase the remote I / O modules. There are many active in this market suppliers, including a full range of automation products and expert mainly provides cpu module suppliers

Input module plc

PLC input module is the A / D converter module, with four independent analog input channels, output module plc signal for each channel can be 1 ~ 5V voltage signal can also be 4 ~ 20mA current signal. plc digital input module can input signal into a binary digital signal corresponding to eight, i.e. the measurement accuracy or resolution is eight of said. Decimal representation, it is converted into a value ranging from 0 to 255, provided to the PLC for further processing.
On the side of the module, corresponding to each plc ethernet module channel has a jumper, the user can be selected by shorting or jumper pins measuring not less then access signal is 1 ~ 5V voltage signal, or 4 ~ 20mA current signal. Signal conversion module, the maximum time is 2ms, the signal converter is working in parallel with the CPU of the PLC, the PLC scan time is not occupied.

Output module plc

Power amplifier components output module plc has a high-power transistors and FET driven DC load, triac drive AC loads, and both can drive an AC load and can drive a small relay DC load. Output current is typically 0.3 ~ 2A, load power is provided by an external field.
Relay output circuit. Internal circuit relay coil is energized, its normally open contacts closed, the external load electrical work. Meanwhile relay from isolation and power amplification, each way just to provide a pair of normally open contacts. And contact parallel RC circuit and varistor to eliminate Tun arc generated when the contacts open, in order to reduce the interference of its CPU.
Is the transistor collector output circuit. . plc communication module to the internal circuit output latch, and then the optical coupler to the output transistor, which saturated conduction state and an OFF state corresponds to turn on and off contacts. Figure regulator to suppress external shutdown and overvoltage surge voltage to protect the transistor, the transistor output circuit delay time. Structure and the transistor output circuit FET communication modules plc is substantially the same.

How to select plc IO module manufacturers

Domestic production plc IO module manufacturers are said to have many thousands, how can choose their own power supply module manufacturers do?
1, for the size of their own requirements. Some foreign brand quality is really good, but the price is not every user can programmable plc  accept, plc IO module and delivery compared to domestic brands, is very long. For some of the larger domestic supplier of power modules also have this problem, if you set its main ship models of non-models, delivery is also not guaranteed. If you own custom made a special power, for small customers, is simply unthinkable. Because SMEs did not like Huawei, ZTE delivery platform choice, to choose their own scale enterprises, is very important. VST such as power companies, specifically for SMEs to provide power solutions, to provide customized services.
2, plc IO module product line to see the  plc temperature control module situation. Such as power modules, it can provide as a half brick, 1/4 brick, 1/8 brick, 1/16 brick industrial products such as can not provide, explain corporate R & D strength and size is small. The ability to customize the product, whether it can provide a wealth of customized products, customized experience like railways, electricity, military areas or very important. Look material. Open a module power, their own look, workable than listen to others. Material from the supply of products, we can see that the quality of power supply manufacturers and positioning, choice of materials, like the Programmable Input Module  power to see the materials. Open a module power, their own look, workable than listen to others. Material from the supply of products, we can see that the quality of power supply manufacturers and positioning, choice of materials like power

output module plc 's product positioning and product characteristics

Use output module plc saving can be considered to contribute to the cause of environmental protection ! Now the market needs the power module also needs to pay attention to it from the environment.
    Switch output module plc products for the  industrial automation plc point system to contribute to a low-carbon society , and now the market demand began to increase , and it requires a smaller size, lighter weight and higher efficiency and less power consumption , lower output power and no-load conditions . In such a market demand , the development of compact, light weight, high efficiency power supply open frame peak power capability . They offer a wide operating temperature range , to ensure that poor working conditions , excellent output level , smaller size and lighter weight of up to 30% compared to existing models , safe operation. Thus, they can make products smaller customers and help develop energy-saving products . In addition , the plc temperature control module  existing lineup with a wide range of input power factor and harmonic correction helps to reduce energy consumption by a significant reduction in energy-saving equipment size and weight that the product positioning of the power module and product characteristics , the more fully explain the power modules it.if the power supply in harsh environmental conditions , the output DC voltage plus the output transient voltage after the noise is still able to maintain a stable the output voltage does not exceed plc input output modules  the limits of the output voltage level of the situation , otherwise may cause the supply voltage exceeds or falls below a logic circuit ( such as TTL circuits ) is exposed to the power supply voltage malfunction, causing further freezing.

input module plc introduced in the DC chopper

DC / DC converter is a variable DC voltage into a fixed DC voltage , also known as a DC chopper . Chopper work in two ways , first pulse width modulation Ts constant change ton ( GM ), input module plc Second, frequency modulation (
(1) Buck circuit - step-down  intelligent plc chopper , the output average voltage less than the input voltage U0 Ui, of the same polarity .
(2) Boost Circuit - boost chopper , the output voltage U0 is greater than the average input voltage Ui, the same polarity .
(3) Buck-Boost circuit - a buck or boost chopper , the average output voltage is greater or less than the input voltage U0 Ui, of opposite polarity , inductive transmission. 4) Cuk circuit - a buck or boost chopper , the average output voltage is greater or less than the input  programmable logical controllers voltage U0 Ui, of opposite polarity , capacitance of the transmission . There Sepic, Zeta circuits. input module plc above non-isolated DC-DC converter circuit , isolated DC-DC converter circuit has a forward , flyback , half-bridge circuit , full bridge circuit , push-pull circuit .
Soft-switching technology makes plc intelligent controller  today's DC / DC undergone a qualitative leap , the maximum output power 300W, 600W, 800W , etc. , the corresponding power density (6.2,10,17) W/cm3, efficiency ( 80 to 90 ) % . The switching frequency (200 ~ 300) kHz, the power density has reached 27W/cm3.

Select the output module plc switch output module

The output module is required for the internal drive signal to PLC low voltage signal is converted to an external output device. The main selection should consider the type and size of the load voltage, the system latency requirements, whether state and frequent load changes.
1. Select the output mode
Digital output module has three output modes: output module plc relay output, thyristor output and transistor output. Relay outputs are cheap, both to drive an AC load, but also for the DC load, but  Programmable Output Module also for a wide range of voltage magnitude, a small voltage drop, and the ability to withstand strong transient over-voltage and over-current. But it belongs to have contact elements, its movement is slow, short life, poor reliability, and therefore, does not only apply to frequent on-off occasions. When used to drive inductive load, output module plc operating frequency does not exceed its contacts 1Hz.
For frequent load off, you should use triac output or transistor output, they are non-contact components. But only for analog output module  Triac output AC load, and transistor output can only be used for DC load.
2. Select the output wiring of different output wiring of the PLC, are generally grouped outputs and two separate outputs, outputs are grouped several output points as a group, sharing a common terminal between the groups are separated , respectively, using a different power. And each output point delimited output has a common, mutual isolation between the outputs, each output point may use a different power source. The main species Programmable Output Module  should be based on how much power the system load may be. General Integral PLC outputs both groups, there are also separate output.

Enter the installation of wiring module plc

input module plc end if set to "always check line" status input module input end of the line (away from 

the module side) must be parallel with the termination resistor programmable logic controller (plc) suppli

ers  module inputs If set to "normally closed check line" Status Input Module Input end of the line (a

way from the module side) must be a plc analog output module in series termination resistors. When th

 module is active output, active output terminal should be parallel termination resistor 4.7kΩ, and IN40

07 series with a diode.