Rockwell Automation 1791DS-IBxxxx Guard I/O DeviceNet Safety Modules - Manual (Page 36)

36 Rockwell Automation Publication 1791DS-UM001J-EN-P - May 2013
Chapter 2 Understand the Operation of Safety Functions
Safety Outputs Read this section for information about safety outputs.
Safety Output with Test Pulse
When the safety output is on, the safety output can be test pulsed, as shown in
the figure and table.
Using this function, short-circuits between output signal lines and the power
supply (positive side) and short-circuits between output signal lines can be
detected. If an error is detected, the safety output data and individual safety
output status turn off.
Figure 19 - Test Pulse in a Cycle
Cat. No. Pulse Width (X) Pulse Period (Y)
1732DS-IB8 Not applicable Not applicable
1732DS-IB8XOBV4 700 μs 600 ms
1791DS-IB12 Not applicable Not applicable
1791DS-IB8XOB8 470 μs 648 ms
1791DS-IB4XOW4 Not applicable Not applicable
1791DS-IB8XOBV4 700 μs 600 ms
1791DS-IB16 Not applicable Not applicable
IMPORTANT To prevent the test pulse from causing the connected device to
malfunction, pay careful attention to the input response time of the device.
44096
X
Y
OUT
On
Off