Allen Bradley 1734-IB8S POINT I/O Guard I/O Safety Module

With firmware revision 1.002 and later, the operation of the muting status bits for test outputs T1 and T3 has changed. Your PLC processor program controls test outputs T1 and T3 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. Figure 21 explains how muting lamp operation, status, and fault detection are monitored.

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