OB 28
Cause of error Reaction to error
Timeout error at input byte IB 0
(process interrupts)
If OB 28 is not loaded, the CPU
changes to the STOP mode.
OB 29
Cause of error Reaction to error
Timeout error of the distributed
peripherals in the following
address areas:
- F 0000H to F EFFFH
- F F200H to F FFFFH
If OB 29 is not loaded, the
system program continues
processing of the user program.
Error address
When a timeout error occurs, you can read the error address in the
system data area (see Chapter 8):
RS Contents Address
68 QVZ error address high E F044H
69 QVZ error address low E F045H
5.6.4
OB 25: Addressing
Error (ADF)
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 (the module is not plugged in, it
is defective, or it is not defined in data block DB 1 of the CPU.
The STEP 5 operation at which the addressing error occurred is
processed completely: For bit operations, the bit in the process image
is scanned and combined logically or set/reset. Load and transfer
operations are also executed. Continued processing can, however,
result in incorrect or unwanted reactions.
Causes of Error and Reactions of the CPU
CPU 948 Programming Guide
5 - 26 C79000-G8576-C848-04
To Next Page
Loading...
Need help?
General
