Chapter 9. Diagnostics
398 PACSystems* RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual GFK-2950C
9.4.2 Loss of or Missing Rack (Group 1)
The fault group Loss of or Missing Rack occurs when the system cannot communicate with an
expansion rack because the BTM (Bus Transmitter Module) in the main rack failed, the BRM (Bus
Receiver Module) in the expansion rack failed, power failed in the expansion rack, or the expansion
rack was configured in the configuration file but did not respond during power-up.
Default action: Diagnostic. Configurable.
1, Rack Lost
The CPU generates this error when the main rack can no longer communicate with an expansion
rack. The error is generated for each expansion rack that exists in the system.
Correction
1) Power off the system. Verify that both the BTM and the BRM are seated properly in their
respective racks and that all cables are properly connected and seated.
2) Replace the cables.
3) Replace the BRM.
4) Replace the BTM.
2, Rack Not Responding
The CPU generates this error when the configuration file stored from the programmer indicates that
a particular expansion rack should be in the system but none responds for that rack number.
Correction
1) Check rack number jumper behind power supply—first on missing rack and then on all other
racks—for duplicated rack numbers.
2) Update the configuration file if a rack should not be present.
3) Add the rack to the hardware configuration if a rack should be present and one is not.
4) Power off the system. Verify that both the BTM and the BRM are seated properly in their
respective racks and that all cables are properly connected and seated.
5) Replace the cables.
6) Replace the BRM.
7) Replace the BTM.
8) Check for Termination Plug on last BRM.
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