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.

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

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.

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.

How to design output module plc in three-wire constant current source driver circuit

output module plc due to the temperature of the integrated operational amplifier parameters that affect not as a transistor or FET parameters affect significantly the integrated amplifier composed of a constant current plc communication modules  source with the stability better, more constant performance advantages. In particular, the need to ground at the load end of the occasion, received a wide range of applications. Dual op amp constant current source. UA1 amplifier output module plc which constitute adder, 1) load can be grounded; 2) When the op amp is a dual power supply, the output current is bipolar; 3) constant current size adjusted by changing the input reference datum reference resistor Rref0 size to achieve, it is easy to obtain a stable small current calibration and compensation.
Since the resistance of the mismatch, the  plc power supply module voltage across the reference resistor output module plc Rref0 will affect the load end of the driving voltage Vb. The same time as a constant current source, and will definitely change with load changes, which will affect the stability of the constant current source. Obviously, this high-precision constant current source is unacceptable. So R1, R2, R3, R4 selection principle which four resistors is to try a small mismatch, and every size of resistor mismatch direction to be consistent. In practice, a lot of the same batch can be screened precision resistors, where resistance is close to elect four resistors.

IO module, also known as the PLC control module

plc IO module is also called a control module, can be output when the control request signal or a switching signal to plc communication module operation of the controlled device, and may receive a feedback signal from the device to the host to report to the fire alarm system linkage important part of the input and output modules on the market can provide a pair of passive normally open / normally power supply module plc contacts for controlling the controlled device, some manufacturers of modules through parameter setting, set to active output (eg Bay GST-LD-8301), there are also double the corresponding input and output modules, the input and output modules, and so more.

output module plc,input module plc

plc digital input output moduleeach play any role in the PLC control system
Digital input module is an external control signal or field detection signal processing module to the PLC CPU, an external signal is generally button, proximity switches, limit switches, plc output module is based on the signal processing logic and internal logic programming input module taken into the , the results of treatment before, switch output signal is output by the high and low output module, to drive external relays, contactors, lights, solenoid valves and other components, thereby enabling the external device corresponding action

Types of PLC input and output modules

Roughly divided into the digital input plc DI, digital output plc DO, analog input AI, analog output AO. Digital inputs and outputs are generally of 24V. Class 2 4 kinds of analog quantity, type 2, respectively, and the current-voltage type. There 0-10V voltage type and -10 to 10V. Current type mainly 4-20MA, 0-20MA. Then the module through A / D converter, converting the analog quantity into a + number between 32767 ~ -32768, and then exercise control

PLC single input-output module features:

1, two bus polarity.
2, the power cord, there is polarity.
3, accounting for two consecutive address points, using electronic encoding encoding.
4, each two monochromatic PLC show the plc digital input output module operation information.
5, enter the linkage equipment operation after two feedback signals.
6, dual voltage output signal.
7, the power line power, the feedback input line circuit, the input line open or short circuit, the module returns fault signal.
8, has a line fault detection options.
9, the plc digital output module can be set to pulse output or level output, appearances default level output.
10, can be connected with an output module PLC output a set of normally open and normally closed output one active node or 24V voltage signal (to increase the output current).

Role of input and output modules

Fire alarm, the alarm controller output module plc needs to start linkage external control devices such as smoke control valve, sending valve, fire shutter doors, fans, alarm, etc., and to accept the action device answer.
analog 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 block. Electronic writing code, you can live encoding. Ji-output control logic output modules can be completed according to the project situation programming. When the controller receives the alarm signal to the detector, based on pre-programmed into the program, the controller will be linked via the bus control signal to the output module, the output module needs to start linkage firefighting equipment; action after the device will accept a signal answer.

output module plc,input module plc

plc digital input output module each play any role in the PLC control system
Digital input module is an external control signal or field detection signal processing module to the PLC CPU, an external signal is generally button, proximity switches, limit switches, plc output module is based on the signal processing logic and internal logic programming input module taken into the , the results of treatment before, switch output signal is output by the high and low output module, to drive external relays, contactors, lights, solenoid valves and other components, thereby enabling the external device corresponding action

input module, also known as the control module

input module, also known as the control module, when the output signal can control requirements, or to provide a switching signal to the controlled device movements, and can receive feedback signal device to the host to report to the fire alarm system is an important linkage part of the plc input module and output modules on the market can provide a pair of passive normally open / normally closed contacts for controlling the controlled device, some manufacturers of analog input module can be set via the parameter set corresponding to the active output there are pairs of input and output modules, multiple input and output modules, and so on.

PLC controller works

Although the ladder program used by many PLC often use such as relays, timers and counters name, but not the internal PLC entities have the hardware , but in the memory and logic control programs do programmatically edit and output elements borrowed from the connect an external china industrial automation plc entity controlled mechanical device to do . So can greatly reduce the space required for hardware controllers . PLC ladder program execution actually works is the first progressive ladder code to scan and read into the CPU and finally perform control operations. Throughout the scanning process includes three steps , "Input status check ", " run " , "Output status updates " as follows:Step one " input status check ": PLC First check the status of each point switch or sensor inputs connected components of ( 1 or 0 for on or off ) , and its status is written in the corresponding memory location Xn. Step two " running " : progressive ladder program will take into the CPU operation , if the program is running you need to enter the contact state , CPU direct inquiries removed from memory. Operation result is stored in the output coil plc analog output modulesmemory location corresponding to withhold response to the output Yn. Step Three "Output status update " : the step two of the output status update to the PLC output unit contacts , and return to step one . This third step is called the PLC scan cycle , and the time required to complete the PLC called the reaction time ,the time of the PLC input signal if the reaction time is less than this , there is the possibility of misreading . After each run the next time the program before execution , output and input status will be updated once, so this mode of operation as an output , said input of " the end of the regeneration program ."

The main job of the output module plc

SCM can be used to direct the development of control systems, but very demanding for the developer (not the general level capable of ) , long development cycles, high costs ( for some large decency you need to Nanda plc power supply module  do a little experiment , a printed circuit board requires a considerable the cost , you can say you use the emulator to develop experimental board , but I have to tell you , do you just verify the feasibility of hardware and software , does not mean that can be used in industrial control systems, industrial control systems because Immunity requirements for very high stability first , rather than the performance of the first , so you must constantly  Nanda plc input output modules test the circuit board design , improvement ) when you solve these problems, you will find that you have done a PLC , of course, If you need to use someone else can easily use the software you'll need a set , so you may not need to tell others about your circuit ( you can not tell anyone ) .
       Many people feel very mysterious PLC , PLC is actually very simple , in addition to its internal CPU speed , the Nanda Programmable Output Module  other functions not as common microcontroller . PLC usually uses 16 or 32-bit CPU, serial communication with the outside world with a channel or two , and has an internal timer can , to improve the reliability plus a watchdog timer is enough .

How to use the input module plc 's multi- segment level setting , display, alarm and automatic level control

In many production areas , it is often necessary to tanks , storage tanks, pools and other containers of liquid level monitoring to the usual traditional relay -contact control , multi- use hard-wired electrical  plc manufacturer appliances , poor reliability, high degree of automation , has there are many enterprises to adopt advanced controller to transform the traditional exposure control , greatly improving the reliability and automation level of the control system , providing a more reliable production guarantee. This paper describes a programmable controller (PLC) A method for monitoring liquid level , its simple circuit structure and low investment ( Available renovation of existing facilities ) , not only a high degree of automation control systems , but also has online modify the function , flexibility, suitable for Nanda cpu module plc  multi- level monitoring applications.
1 . Control requirements
The control system can be based on the needs of production is divided into multi- level set , and segment display , when the minimum level to start automatically when you add liquid feed pumps , liquid level reaches the set value audible alarm and stop the pump ; the operator can turn plain by the OK button to lift the alarm sound , flashing lights ; system with manual / automatic control modes , and a test function.
2 . PLC Selection
In this case , select the PLC PLC should consider the cost performance , high reliability, choice , quite , load capacity suitable , affordable PLC. This article introduces the four level control object , for example, according to analysis and comparison of a variety of plc input output modules  factors and control system input and output points requirements.
3 . System hardware configuration
To achieve the level of manual / automatic control, you need to enter the mouth 12:00 , 8:00 outlet , use C20P 20点PLC I / O unit , optically isolated input and output isolation relays , load capacity ; liquid level detection using Reed tube sensor , manual / automatic conversion , run / test conversion and level settings using double- knob manually start the pump , the pump stops and confirmation test using normally-open button ; selection of electronic sound alarm output and 24V DC lights, relays . See Figure a hardware configuration diagram

output module plc in control system

Programmable controller (Programmable Logic Controller) referred to a PLC or PC, is developed from the early relay logic control system, which constantly absorbing micro- computer technology to  Nanda analog output plc continuously enhance the functionality gradually suitable for complex control tasks.
 PLC viable reason is that it is more suitable for industrial field and market requirements : high reliability , simple and strong anti- interference of various programming installation, low price and long life. Than the microcontroller, its input and output ports closer to the field devices , without adding too much of the middle part or need more interfaces , so saving the plc input output modules  user time and cost. PLC lower end (input side ) of the relay , a transistor and thyristor control means for the user while the upper end is usually a microcomputer . When people use it , you can not carry out specialized training in computers , programmable controllers can be operated and programmed. Used to perform a variety of different levels of complexity of industrial control tasks. It began with a wire connected to it subtly with switching devices constitute or use different logic control sequence control . So far, the PLC programming languages ​​- Ladder can also see the shadow of the wiring . Until the late 1960s , early 1970s, the advent of the programmable controller , with the rapid development of microelectronics technology, computer technology and data communications technology, and the emergence of the  plc soe module microprocessor , PLC products towards small and ultra- miniaturization conducted a leap , and finally to the early PLC from the initial logic control, sequence control , PLC has developed into a modern logic, timing, counting , memory and arithmetic operations , data processing, communications and networking functions such as PID loop controller .