Omron G9SX - Page 92

Appendix
2. Logical AND Connections
92
G9SX
USER'S GUIDE
■ Simplifying Safety Circuits
Safety circuits were traditionally built by combining relay contacts, but now the logical AND connections of the G9SX
simplify building safety circuits.
A safety system will be described in which the power is turned ON when safety input 1 and safety input 2 are
simultaneously input.
Previous Circuit with Relay Units
Safety Circuit with G9SX
Motor controller
M
KM1
KM2
(1)
Internal
circuit
Internal
circuit
Safety Input 1 Safety Input 2
Unit 1
Unit 2
Feedback
Input
Feedback
Input
Robot
Motor controller
M
KM1
KM2
Logical AND
connection
Internal
circuit
Internal
circuit
Safety Input 1
Unit 1
Unit 2
Feedback
Input
Robot
Section (1) in the above figure can
be constructed with only 2 wires.
Safety Input 2