output module plc circuit Introduction

output module plc power amplifier element driving power plc communication module transistors and DC load, triac drive AC loads, and both can drive an plc programmable intelligent controller load and can drive a small relay DC load. The output current is typically 0.3 ~ 2A, load power provided by the external field.

input module plc choice

input module plc choice
 input module plc choices: 1. Select the power module power module choice is simple, just consider the power supply's rated output current on it. Rated current of the power module must be greater than the total current consumption of the CPU module, I / O modules, and other modules. input module plc select only the modular structure of the PLC, the PLC does Programmable Output Module  not exist for the monolithic power of choice. 2. input module plc programming choice for small control system or PLC system does not require on-line programming, generally used cheap simple programmer. For Chinese and complex systems composed of high-end PLC or need online programming PLC systems can be equipped with powerful, easy programming smart programmer, but a smart programmer expensive. If you have an existing personal computer, you can use the PLC programming software package for programming the function on a personal computer. 3. Writer's choice in order to prevent interference due to plc communication modules  voltage variations and other factors make lithium destruction RAM, users and programs can be selected EPROM writer, through which the user program solidified in EPROM. Now some PLC or EPROM programmer itself has written functions.

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.

Some of the sequence output module plc

An automatic identification IO modules, IO consecutive numbers down by a physical connection. But the program even without the IO module may still running down. Because IO address is mapped to the cpu's memory, program memory operations generally.
2 software configuration and download it to the cpu to identify the IO module. Once the module occurs from such failure, cpu system plc communication modules  fault alarm can be issued immediately, the hardware must meet the configuration settings, and IO address mapping can also be freely allocated memory space.
I / O expansion bus, there are many, output module plc various PLC manufacturers are different, or look at the refresh rate. Slow, then you can use SPI and the like, and then a little faster, then you can do a physical interface with FPGA, there is one of the fastest Industrial Ethernet.
Simple application can even use the serial port to do. I / O port expansion is the I / O address to the CPU memory map, but  plc logic controller this map is a combination of software and hardware self-identification are defined manually or through assignment and allocation. May be in the exhaust line is whether there should be a line behind the front of the module has a successor in charge of the report module, if the module behind the successor state that level on this line, and when no module is not the same, so that they can be judged No follow-up module, CPU module communicates with other modules using the relay mode, the transmission down a level, that is, only the CPU module and from his recent communication module, output module plc and other modules if you want Communication would have to transit through  plc controller manufacturer other modules, so that modules are installed in accordance with the order of the address of the module can be determined, on power CPU perform a self-test program, each module to report their labeling information so that you can know the total CPU module the number of mounted modules, each module location and type of each module.

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.