Rockwell Automation Allen-Bradley 1734-IB8S, User Manual

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Rockwell Automation Publication 1734-UM013J-EN-P - July 2014 85
Configure the Module in a GuardLogix Controller System Chapter 5
7. From the Input Error Latch Time field, enter the time the module holds an
error to make sure the controller can detect it (0…65,530 ms, in increments
of 10 ms - default 1000 ms).
This setting provides more reliable diagnostics. The purpose for latching
input errors is to make sure that intermittent faults that may exist only for a
few milliseconds are latched long enough to be read by the controller. The
amount of time to latch the errors should be based on the RPI, the safety
task watchdog, and other application-specific variables.
8. Click Apply.
Configure the Test Outputs
Follow this procedure to complete the test output configuration.
1. From the Module Properties dialog box, click the Test Output tab.
2. Assign the Point Mode.
There is also a Test Output Fault Action parameter that can only be read or
written to via explicit messaging. If communication to the module times
out, you can set the test outputs to Clear OFF (default) or Hold Last State.
For more information, see
Appendix B .
3. Click Apply.
Choose Description
Not Used The test output is disabled (default for T2 and T3).
Standard The test output point can be controlled programmatically by the GuardLogix
controller.
Pulse Test The test output is being used as a pulse test source (default for T0 and T1).
Power Supply A constant 24V is placed on the output terminal. It can be used to provide
power to a field device.
Muting Lamp Output
(terminals T1 and T3
only) An indicator lamp is connected to the output. When this lamp is energized, a
burned-out bulb, broken wire, or short to GND error condition can be detected.
Typically, the lamp is an indicator used in light curtain applications.