Omron G9SX User Manual page 92

2. Logical AND Connections
■ 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
G9SX
92
USER'S GUIDE
Safety Input 1 Safety Input 2
Internal
Unit 1
circuit
Feedback
Input
Internal
circuit
Feedback
Input
Safety Input 1
Internal
Unit 1
circuit
Logical AND
connection
Section (1) in the above figure can
be constructed with only 2 wires.
(1)
Unit 2
KM1
KM2
Safety Input 2
Internal
circuit
Feedback
Input
KM1
KM2
Motor controller
M
Robot
Unit 2
Motor controller
M
Robot