PACSystems™ RX3i and RSTi-EP CPU Reference Manual Section 4
GFK-2222AK October 2019
CPU Operation 91
2. Navigate to the “Controller Status” page in the OLED Display.
3. Select the “Recovery PLC” option.
4. Select the “Clear StopHalt” option.
5. Confirm the command by selecting “OK”.
o The message “Please wait. Resetting in about 30 secs” appears in the
display.
o After about 30 seconds, the PLC restarts.
o After the restart, the PLC will be in STOP mode. The STOP-Halt mode is
gone.
o The following faults are present in the Controller Fault table:
▪ “User memory not preserved.” Error Code: 7. Group: 130
▪ “User Initiated Recovery Action: Controller commanded to
power up in Stop Mode.” Error Code: 670. Group: 140
6. Connect to the PLC and perform the necessary corrections. If the PLC is placed in
RUN mode without fixing the offending code, the PLC will enter STOP-Halt and
the procedure will have to be performed again.
4.5.1.4 STOP-Fault Mode
In STOP-Fault Mode, logic execution and I/O Scanning cease after the number of last
scans (configured by the user) has been exhausted. Client communications also cease at
that time. Server communications are available, but with PLC data which has become
static.
Within PME, the user can configure each fault action to be either diagnostic or fatal.
▪ A diagnostic fault does not stop the Controller from executing logic. It sets a
diagnostic variable and is logged in a fault table.
▪ A fatal fault transitions the Controller to the STOP-Fault Mode. It also sets a
diagnostic variable and is logged in a fault table.
Within PME, the user can also configure the number of last scans to be executed in the
event of a fault (see PME Scans tab, Number of Last Scans parameter).
To recover from STOP-Fault Mode, resolve the underlying cause and clear the Controller
Fault Table. This allows the CPU to transition to STOP-I/O Disabled Mode.
4.5.2 STOP-to-RUN Mode Transition
The CPU performs the following operations on Stop-to-Run transition:
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