Technical data

5.6.3
ADF (Addressing Error)
An addressing error occurs when a STEP 5 operation references a
process image input or output to which no I/O module was assigned at
the time of the last COLD RESTART (e.g. the module is not plugged
in, it is defective or it is not defined in DB 1 of the CPU).
OB 25 The system program interrupts the execution of the user program and
calls organization block
OB 25. After executing the program in
OB 25, the CPU continues with the next operation of the interrupted
program. The STEP 5 statement that caused ADF was executed but
with an undefined input or output value.
If OB 25 is not programmed, the CPU goes into the STOP mode when
the error occurs, unless you have specified in data block DX 0 that the
program should continue.
The address error monitoring can also be completely suppressed if
you program DX 0 appropriately.
Error identifiers The system program transfers the following as error identifiers:
ACCU-1-L = 1E40H
ACCU-2-L = ADF address
5.6.4
QVZ (Timeout Error)
A timeout error occurs when an input or output module is addressed
and does not respond with the ready signal (RDY) within a specific
time. The cause of the timeout may be a defect on the I/O module or
the module may have been unplugged from the PC during operation.
The following timeout errors interrupt the user program, and call the
appropriate organization blocks:
QVZ during direct access
via the S5 bus
Timeout in the user program during direct access via the S5 bus to
CP, IP, coordinator or to a peripheral module (e.g. with load and
transfer operations L/T P... or O...):
OB 23 The system program calls organization block OB 23, if it is loaded.
5
Errors in RUN and in RESTART
CPU 928B Programming Guide
C79000-B8576-C898-01 5 - 53