PLC's & IO

Programmable Logic Controllers (PLCs) are computer control systems that detect the state of all input devices connected to it, make a decision based on a user-created program and then output commands to any devices connected to it. PLCs monitor, control and communicate automated processes and act as the physical interface between devices and a SCADA or HMI system.

Input/Output (I/O) signals allow for communication in a processing system. Inputs in a system are any data or signal that is received while outputs are any data or signal that is sent. Input signals are often connected to sensors, switches or other measuring devices that provide information, while output signals are connected to relays or other control devices.

Smart relays are small-scale PLCs designed for simple automation tasks where lower I/O points are required. These tasks include: counting, timing, arithmetic functions, storage, etc. A single smart relay can take the place of many control devices by streamlining and combining controls from many pieces of equipment.