Rockwell Automation 1791DS-IBxxxx Guard I/O DeviceNet Safety Modules - Manual (Page 27)

Rockwell Automation Publication 1791DS-UM001J-EN-P - May 2013 27
Understand the Operation of Safety Functions Chapter 2
Using a Test Output with a Safety Input
A test output can be used in combination with a safety input for short circuit
detection. Configure the test output as a pulse test source and associate it to a
specific safety input.
The test output can also be configured for a power supply to source 24V DC for
an external device, for example, a light curtain.
Figure 11 - Example Use of a 1791DS-IB12 Module
Figure 12 - Test Pulse in a Cycle
Cat. No. Pulse Width (X) Pulse Period (Y)
1732DS-IB8 500 μs 600 ms
1732DS-IB8XOBV4 500 μs 600 ms
1791DS-IB12 700 μs 648 ms
1791DS-IB8XOB8 700 μs 648 ms
1791DS-IB4XOW4 700 μs 648 ms
1791DS-IB8XOBV4 500 μs 600 ms
1791DS-IB16 500 μs 600 ms
24V DC Output with Test Pulse
External Contact
Safety Input
Terminal
24V
44078
X
OUT
Y
On
Off