870ITEC-AYFNZ servo control processor FOXBORO

Description

The interface between PLC and electrical circuit is completed through the input and output part (I/O). The I/O module integrates the I/O circuit of the PLC, with the input register reflecting the status of the input signal and the output point reflecting the status of the output latch. The input module converts electrical signals into digital signals and enters the PLC system, while the output module is the opposite. I/O is divided into modules such as switch input (DI), switch output (DO), analog input (AI), and analog output (AO).

Switching quantity refers to a signal that only has two states: on and off (or 1 and 0), while analog quantity refers to a continuously changing quantity. The commonly used I/O classifications are as follows:
Switching value: divided by voltage level, there are 220VAC, 110VAC, 24VDC, and separated by isolation method, including relay isolation and transistor isolation.

Analog quantity: Classified by signal type, there are current type (4-20mA, 0-20mA), voltage type (0-10V, 0-5V, -10-10V), etc. Classified by accuracy, there are 12bit, 14bit, 16bit, etc.

In addition to the general IO mentioned above, there are also special IO modules such as thermal resistors, thermocouples, pulses, etc.
Determine the module specifications and quantity based on the number of I/O points. I/O modules can be many or few, but their maximum number is limited by the basic configuration capabilities that the CPU can manage, that is, by the maximum number of backplane or rack slots.

PLC module, programmable controller, CPU module, IO module, DO module, AI module, DI module, network communication module,
Ethernet module, motion control module, analog input module, analog output module, digital input module, digital output module
Module, redundant module, power module, relay output module, relay input module, processor module.