IS215UCVEH2AB GE Controller communication backplane

When the CPU is in STOP Mode, it does not execute the application program. You can configure

whether the I/O is scanned during STOP Mode. Communications with the programmer and intelligent

option modules continue in STOP Mode. Also, bus receiver module polling and rack reconfiguration

continue in STOP Mode.

In both STOP Modes, the Controller Communications and Backplane Communications windows run in

Run-to-Completion mode and the Background window runs in Limited mode with a 10 ms limit.

The number of last scans can be configured in the hardware configuration. Last scans are completed

after the CPU has received an indication that a transition from Run to Stop or Stop Faulted mode

should occur. The default is 0.

SVCREQ13 can be used in the application program to stop the CPU after a specified number of scans.

All I/O will go to their configured default states, and a diagnostic message will be placed in the CPU

Fault Table.

Following an internal fault, such as a hardware watchdog timeout or an ECC Memory Check fault, the

CPU will automatically go into STOP-Halt mode. In this mode, logic execution and I/O scanning is

suspended.

Depending on the underlying cause, CPU rack backplane communications may also be suspended.

For example, following a hardware watchdog timeout, the CPU restarts in STOP-Halt mode with

backplane communications operational. In contrast, following an ECC Memory Check Fault, the CPU

immediately enters STOP-Halt mode with backplane communications suspended.

To recover from STOP-Halt mode, the CPU/CPE must be disconnected from its backup power source

(battery or Energy Pack), powered off, then powered back on, after which the backup power source

should be reconnected.

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