Exiting the SOFT STOP status
The SOFT STOP status can be exited as follows:
a) by selecting a restart (refer to Section 4.4),
b) by an OVERALL RESET followed by a COLD RESTART.
4.2.2
HARD STOP If the system program can no longer be executed properly, the CPU
changes to the HARD STOP mode to ensure a safe mode in this
situation.
A HARD STOP can be caused by the following:
•• stop operation (STW) for the system program
•• ISTACK overflow (STUEU),
•• timeout (QVZ) or parity error (PARE) in the system
RAM/EPROM,
•• error in system program
Note
The CPU is stopped. You can only exit the HARD STOP mode
by switching the power off and then on again!
LED displays
The HARD STOP status can be recognized by the following LEDs on
the front panel of the CPU:
LED Status
RUN off
STOP off
SYSFAULT on
BASP on
STOP Mode
CPU 948 Programming Guide
C79000-G8576-C848-04
4 - 13
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