According to the different input devices of the safety circuit, the following 5 aspects can be selected:
(1) Input device
(2) Number of output channels
(3) Back-end driving capability requirements
(4) Security level
(5) Functional requirements
The input device of the mechanical safety circuit is usually a safety sensor, which mainly includes an emergency stop button, a safety door, a safety light curtain, a safety mat, an interlock device, a two-hand button, and a laser scanner.