Siemens SIMATIC S5 CP 523 Manual page 44

Notes on Operation
During the restart procedure, the CP signals "Module busy" (XF
accept any jobs during this time. For this reason, you must scan the module's status byte (byte 0)
for the XF before issuing the first job request.
H
OB 22
JU FB99
* 5.2
Note:
The restart organization block OB 22 is only processed if the CPU is in RUN mode before you
switch from POWER OFF to POWER ON.
Variations in the restart behaviour of the CP 523 or its communications partner can lead to the
loss of data during the restart phase.
4.1.2 Memory Submodule Evaluation
The serial interface parameters and message texts specified on the module are checked in this
routine. Errors are assigned an appropriate number in byte 0 "Module status" and can be evalu-
ated in the control program.
Error Number in
Byte 0
X1
H
X2
H
X : may assume different values
4-2
FB 99
M001 :L KH 0000
:T PW 128*
:L KH 000F
:L PY 128
:AW
:!=F
:JC =M001
:BE
Table 4-2. Memory Submodule Faults
Error
Memory submodule
defective
No message texts
configured
) in the status byte. The CP cannot
H
Explanation
Wait loop until the CP 523 has completed
the restart routine.
Remedy
PLC POWER OFF plug in functional
memory submodule PLC POWER ON
Configure message texts ( 6.4)
Wrong or defective memory submodule
plugged in?
CP 523
EWA 4NEB 811 6044-02a