Technical data

The following tables explain the meaning of the individual bits.
>>STP<< line (CONTROL BITS)
Control bit Meaning
»STP«
CPU is in the STOP mode
STP-6
Not used
FE-STP
Error stop: stop mode caused by NAU (power failure),
PEU (peripherals not ready), BAU (battery not ready),
STUEB (BSTACK overflow), STUEU (ISTACK
overflow), DOPP (double call error) or CPU fault
BARBEND
Program test end: stop mode after PROGRAM TEST
END online function (COLD RESTART required)
Is not set if the END PROGRAM TEST function was
executed with the CPU in the STOP mode.
PG-STP
PG-STOP: stop mode due to command from PG
STP-SCH
STOP switch: stop mode due to mode selector in
position STOP
STP-BEF
Stop operation:
-stop mode caused by STEP 5 operation "STP"
-stop mode after stop command from system
program, if error
-organization block is not programmed
MP-STP
Multiprocessor STOP:
-reset switch on the coordinator in STOP position or
-different CPU in the STOP mode in multiprocessing
Table 5-1 Meaning of the control bits in the >>STP<< line
Control Bits and Interrupt Stack
CPU 928B Programming Guide
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