Technical data

Cause of interrupt
ISTACK
ID
Meaning (called error OB)
BAU
Battery not ready = back-up battery failure (central
controller)
MPSTP
Multiprocessor STOP:
- reset switch on the coordinator in STOP position or
- STOP at a different CPU in multiprocessor
operation
Table 5-7 continued:
ZYK
Cycle monitoring time exceeded
QVZ
Timeout during data exchange with I/O peripherals
ADF
Addressing error for inputs and outputs with process
I/O image
STP
- stop mode caused by setting the stop switch to
STOP
- stop mode caused by command from PG
- stop mode after processing the STEP 5 operation
"STP"
- stop mode after stop command from system program,
if error organization block is not programmed
BCF
Operation code error: error detected during the
operation decoding
- substitution error: processed STEP 5 operation
cannot be substituted
- operation code error: processed STEP 5 operation
is incorrect
parameter error: parameter of the processed
STEP 5 operation is not permitted
S-6
Interface error
LZF
Runtime error: error detected during the execution
of an operation:
- called block not loaded
- load/transfer error with data blocks
- other runtime errors
5
Control Bits and Interrupt Stack
CPU 928B Programming Guide
C79000-B8576-C898-01
5 - 23