Rockwell Automation Publication 1734-UM013J-EN-P - July 2014 41
Safety Inputs, Safety Outputs, and Safety Data Chapter 2
Figure 20 - Muting Lamp Timing Diagram
Table 4 shows the expected behavior of the muting status for test outputs T1 and
T3. Keep these points in mind as well:
• When power is applied to the 1734-IB8S module, and T1 or T3 remains
commanded off, the muting status defaults to on.
This bit operation is designed to help prevent erroneous muting
instruction faults from the GuardLogix controller. This bit status may not
be the true indication of a burned-out lamp.
Before checking the state of the corresponding muting status, be sure the test
output is commanded on. Once the test output is commanded on, a maximum
time of 6 seconds is required for the module to detect a burned-out lamp.
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