Muting Lamp Operation

To use test outputs for muting lamp operation, select Muting Lamp for the Test Output Point Mode in the Module Properties dialog.
Your controller program controls test outputs 0…3 (TO0…TO3) to illuminate a muting lamp. 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 or commanded Off and a fault is detected.
Monitor Muting Lamp Operation, Status, and Fault Detection
TIP:
The lamp test interval is 2 seconds. Two consecutive failed lamp tests are required to declare a burned-out lamp condition.
The lamp test does not always run immediately after the test output is energized. It starts at the next 2-second interval. To allow time for two consecutive test intervals, program a minimum Test Output On Time of 4 seconds.
Expected Behavior of Muting Status for Test Outputs
Test Output Commanded State
Lamp Condition
Muting Status Bit
Required Action
ON
Bad (open circuit)
0
Repair the lamp.
ON
Good
1
None, normal condition, the lamp is operating properly.
OFF
Bad (open circuit)
0
If the lamp remains OFF after the test output is cycled, repair the lamp.
OFF
Good
1
None, normal condition
  • When power is applied to the safety input module and the test output remains commanded Off, the muting status bit defaults to 1.
    This bit operation is designed to help prevent erroneous muting instruction faults from the owner-controller.
    This bit status is not always the true indication of a burned-out lamp.
    IMPORTANT:
    Before you check the state of the corresponding muting status, be sure that the test output is commanded On. Once the test output is commanded On, a maximum time of 4 seconds is required for the module to detect a burned-out lamp.
  • If a muting lamp circuit is open when power is applied to the module, the condition is detected when the test output is commanded On.
  • When a lamp burns out and is replaced, the fault (muting status bit) returns to the good condition, independent of the state of the test output.
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