GE PACSystems RX7i Reference Manual page 171

Chapter 4. CPU Operation
For both watchdog reset types, the CPU is power cycled after the energy pack (for the CPE models), or
battery (for the other models listed) has been removed. This procedure gets the CPU out of STOP-Halt.
The backup power source should then be reconnected.
RX3i CPU Response to a Hardware Watchdog Timeout:
The following responses to a hardware watchdog timeout are common to all RX3i CPU and CPE models:
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While the CPU/CPE is in STOP-Halt mode, you can connect the programmer software or PACs
Analyzer to view the fault tables, including any faults logged before the timeout. (See below for
distinctions between CPU and CPE behavior.) The PACS Analyzer software is a tool that is embedded
in PME. It can also be downloaded from GE's Automation and Controls support website
www.geautomation.com/support.
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During startup following hardware watchdog reset, the CPU/CPE logs an informational fault with
Error Code 446, which indicates a watchdog auto-reset occurred.
The following responses to a hardware watchdog timeout are different between RX3i CPU and RX3i CPE
models:
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RX3i CPU310, CPU315, and CPU320 retain Controller and I/O Fault tables after a hardware watchdog
timeout.
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RX3i CPE302, CPE305, CPE310, CPE330, CPE400 and RSTi-EP CPE100/CPE115 do not retain
Controller and I/O Fault tables following a hardware watchdog timeout.
Note: PACSystems does not support Fatal Fault Retries.
160 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD