Allen-Bradley 1734-OB8S User Manual

Rockwell Automation Publication 1734-UM013N-EN-P - September 2017 41
Safety Inputs, Safety Outputs and Safety Data Chapter 2
Safety Outputs
(1734-OB8S and 1734-OBV2S)
Read this section for information about safety outputs.
Safety Output with Test Pulse
When the safety output is on, the safety output can be configured to pulse test
the safety output channel. By using this function, you can continuously test the
ability of the safety output to remove power from the output terminals of the
module. If an error is detected, the safety output data and individual safety
output status turn off.
Figure 18 - Test Pulse in a Cycle
For the 1734-OB8S and 1734-OBV2S modules, the pulse width (X) is typically
475 μs; the pulse period (Y) is typically 575 ms.
IMPORTANT
To help prevent the test pulse from causing the connected device to
malfunction, pay careful attention to the input response time of the output
device.
44096
X
Y
OUT
On
Off

Allen-Bradley 1734-OB8S Specifications

General

Brand	Allen-Bradley
Model	1734-OB8S
Category	Control Unit
Language	English