Rockwell Automation Publication 1791ES-UM001G-EN-P - November 2016 21
Safety Function Operation Chapter 1
Muting Lamp Operation
The 1732ES modules support this muting lamp feature. The feature was added
to 1791ES modules in firmware revision 1.009. The operation of the muting
status bits for the test outputs has changed. Your PLC processor program
controls certain test outputs to illuminate a muting lamp:
• T3 and T7 for 1791ES-IB8XOBV4, 1732ES-IB8XOBV4,
1732ES-IB8XOB8
• T3, T7, and T11 for 1732ES-IB12XOB4 and 1732ES-IB12XOBV2
• T3, T7, T11, and T15 for 1791ES-IB16 and 1732ES-IB16
Muting lamp status is monitored with a test that runs periodically during every
test interval to detect a burned-out lamp. The test runs repeatedly when the
test output is commanded on. Figure 10
explains how muting lamp operation,
status, and fault detection are monitored.
Figure 10 - Muting Lamp Timing Diagram
TIP The lamp test interval is 3 seconds. Two consecutive failed lamp tests are
required to declare a burned-out lamp condition. The lamp test does not run
immediately after the test output is energized. It starts at the next 3-second
interval. To allow time for two consecutive test intervals, program a
minimum Test Output On Time of 6 seconds.
Connected
Muting Lamp
Disconnected
Active
Lamp Test
Inactive
Good
Muting Status
Burned-out
On
T3 Output*
Off
* IMPORTANT: Your program controls the output, not the Muting Status bit.
Connected
Disconnected
On
Bulb is Connected/Good
Test Interval
Te st
Time
Bulb is Disconnected/Burned-out
Off
1. Burned-out lamp detected.
2. Good lamp detected.
3. Intermittent lamp testing stopped.
4. Intermittent lamp testing started.
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