Safety Inputs - Omron DeviceNet DST1 Series Operation Manual

1-4 Description of Safety Functions
1-4-2

Safety Inputs

Test Pulse from Test Output
A test output is used in combination with a safety input. Specify the corresponding test
output terminal to use as the test source. The test output terminal is used as a power
supply to connect an external input device to the safety input terminal.
A test pulse is output from the test output terminal to diagnose the internal circuit when
the external input contact turns ON. Using this function, short-circuits between input
signal lines and the power supply (positive side), and short-circuits between input signal
lines can be detected.
24 V
1-12
Example: DST1-ID12S-1
Here, IN0 and T0 are used in combination,
V V 0 1
G G T0 T1
Safety input
terminal
External contact
24 V
V
G
24 V
0 V
T0
External contact
Short-circuit between input signal line and
IN0
power supply (positive side)
T1
External contact
IN1
Short-circuit between input signal lines
2 3 4 5 6 7
T0 T1 T0 T1 T0 T1
24 V DC output with test pulse