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.

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.

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.