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.