Rockwell Automation Publication ICSTT-RM406J-EN-P - February 2021 39
Chapter 4 About Troubleshooting
Simplex Module Configuration
When a simplex module channel fault exists for longer than the module PST
the channel shows a fault condition and the module reports the following
status values:
• Channel State = 7
• Channel Input State = FALSE
•Line fault = TRUE
• Discrepancy = TRUE
• Channel fault = TRUE
• Channel reports a voltage value = 0
Dual Module Configuration
When the reported values between two input modules in dual configurations
diverge by more than two times the safety margin specification for the time it
takes for two application scans as follows:
• Digital input modules diverge by more than 2.0 Vdc.
• Analogue input modules diverge by 0.4 mA.
The lower of the two values will be reported and a discrepancy flag is set and
the configuration degrades to a simplex operation.
Triple Module Configuration
When the reported values between modules in digital/analogue triple
configuration diverge by more than two times the safety margin specification
for the time it takes for two application scans, that is by the following values:
• Digital input module by more than 2.0 Vdc.
• Analogue input module by 0.4 mA.
The lower of the two values will be reported and a discrepancy flag is set and
the configuration degrades to a dual operation.
Output Channel Shutdown
When an output channel is in shutdown mode the output module drives its
outputs to their configured shutdown settings; for example, de-energized or
hold last state. The shutdown mode and channel drive states stay in place until
new command states are received from a running application, or until the
module loses power.
On power up or module insertion, an output module de-energizes all channels
and they stay de-energized until command states are received from a running
application.
Dual Output Module Shutdown
As long as one module in a group continues to receive updated command state
values from a running application in the PST, each channel is driven according
to its commanded state. This covers the situation when only one module out of
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