ABB 07AC91 Analog I/O Unit GJR5252300R0101

I/O modules refer to the input/output modules of a PLC, where i refers to input and o refers to output. I/O modules are important modules for industrial automation and play an important role in production.

PLC (Programmable Logic Controller) refers to the programmable controller, which is a kind of industrial control computer system, his role is to control the process of industrial production, the function of the input/output (I/O) module is to achieve its connection with the industrial production process, so it can be said that the I/O module is the bridge link between the PLC and the production site Therefore, it can be said that the I/O module is the bridge between the PLC and the production site.

I/O module terminals are divided into four parts: bus terminals, control output terminals, controlled equipment status feedback terminals, and

Source terminals. The input module is used to receive and collect input signals of two types: switching input signals (typically from pushbutton switches, travel switches, digital dip switches, proximity switches, photoelectric switches, pressure relays, etc.); and analogue input signals (typically from potentiometers, thermoelectrics, speed motors, various transmitters). The input module also needs to convert these different level signals into digital signals so that the CPU can receive and process them. The role of the output module is to receive the digital signals processed by the CPU and convert them into signals that can be received by the actuating components on site and used to control contactors, solenoid valves, regulating valves, speed control devices, etc. Another type of load controlled is that of indicators, digital displays and alarm devices, etc.

In order to improve the anti-interference ability of the equipment, the I/O module generally also comes with an opto-isolation device (which is usually used in the analogue I/O module isolation amplifier, two digital I/O module is generally used by the phototriode and light-emitting diode composition of the photocoupler).