MELSEC QS SIL 3 Safety Controller

Mitsubishi Electric

The safety programmable controller is an International Safety Standard certified PLC for safety control. When connected with a safety device, such as an emergency stop switch or light curtain, this programmable controller executes safety control by turning the safety output OFF with a user-created sequence program.

Machine control of e.g. conveyor is executed with a general-purpose programmable controller in the conventional manner. The difference between the safety programmable controller and general-purpose programmable controller lies in that if the safety programmable controller itself fails, it performs a self-diagnosis to detect the failure and turn the safety output OFF forcibly.
This prevents the safety functions from being disabled because of a fault.

Patryk Nowicki