User Manual Chapter 4
GFK-2749A Jan 2020
Diagnostics 78
Chapter 4: Diagnostics
4.1 PSM Module LED Indicators
For details on the system status information provided by the LEDs, refer to page 2.
4.2 PSM Module Health Status
The %I offset 1 bit is a PSM heartbeat. It toggles every RX3i Controller scan as an indication
that the PSM module is communicating with the CPU.
The %I offset 2 bit is set to 1 when both cables between the PSM module and the Terminal
Assembly are installed correctly. This means:
•
GRID1 on the Terminal Assembly is connected to GRID 1 on the PSM module
•
GRID2 on the Terminal Assembly is connected to GRID 2 on the PSM module
•
The same voltage range is used for these connections.
Under special installations, the user can use a different arrangement but then must ignore
this indication.
%I offset 8 bit is the “new data” bit that indicates this is the first PLC scan where this power
data is available.
The remaining %I status bits indicate alarms, ANSI functions and signal quality information.
For the functions of the %I bits, refer to “PSM Status Flags” in chapter 3.
4.3 Point Faults
Enabling Point Faults on the CPU Memory tab allows the use of Fault and No Fault contacts
to alert the PLC logic to an issue with the PSM module. See the PACSystems CPU Reference
Manual, GFK-2222 for more details.
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