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.

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 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