Technical data

The two data words are stored at the following absolute memory
addresses:
system data word RS 3: KH = EA03
system data word RS 4: KH = EA04
The error identifier in system data word RS 3 tells you
what type of
error has occurred.
System data word RS 4 tells you
where the error has occurred.
The error identifiers are in the KH data format.
Analyzing system data words
RS 3 and RS 4 on the
programmer
Using the online function INFO ADDRESS (KH = EA03 or EA04)
you can read out the contents of the two system data words directly
and discover the cause of the error.
System data RS 80 If the system program detects a serious system error, it sets the control
bit INF in the interrupt stack (see Section 5.3) and enters an additional
error identifier in the data format KH in system data word RS 80.
The system data word RS 80 has the absolute memory address
KH = EA 50. You can read it out in the same way as the system data
RS 3 and RS 4.
Error identifiers in ACCU 1
and ACCU 2
If errors occur in the STEP 5 program execution in RESTART or in
the
CYCLE for which there is a particular organization block as user
interface, the system program automatically enters additional error
information in the accumulators ACCU 1 and ACCU 2 when the
organization block is called. These entries also define the cause of the
error more exactly (see Section 5.6).
The error identifier in ACCU 1 tells you
what type of error has
occurred.
The error identifier in ACCU 2 (if entered) tells you
where the error
occurred.
The error identifiers are in the KH data format.
5
Error Information
CPU 928B Programming Guide
C79000-B8576-C898-01
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