Device-Related Diagnosis; Structure Of Bytes 6 And 7 Of The Diagnostic Message; Structure Of The Device-Related Diagnosis - Siemens SIMATIC CP 541 Manual

Diagnostics and Error Handling
6.3.3

Device-Related Diagnosis

Range
Contents
Device-Related
Diagnosis
Table 6-11 Structure of the Device-Related Diagnosis, Byte 7 of the Diagnostic Message
1
Bit Meaning
0 Response monitoring in
CP 541 elapsed
1 PLC is sending again.
1
Bits not mentioned are not significant.
6-18
The device-related diagnosis is contained in bytes 6 and 7.
Table 6-10

Structure of Bytes 6 and 7 of the Diagnostic Message

Byte Value
6 02 Length of device-related diagnosis in bytes inc. header
H
7 0X Device-related diagnosis
H
The significance of the individual bits can be found in
Table 6-11.
The device-related diagnosis (byte 7) is arranged as shown in Table 6-11. A
report is signaled with a 1.
Cause/Reaction
The PLC at the CP 541 has not
reported with a DP message,
within the time specified with
parameter DPWD in DB1.
Detected failure of the DP con-
nection between CP 541 and
PLC no longer exists.
Content
Remedy
Inspect the connection between
CP 541 and PLC for an open-
circuit.
Check the PLC connected to
the CP 541 for faults.
Increase the monitoring time
specified in DPWD.
Change the user program in the
PLC for more frequent sending
to the DP master.
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Communications Processor CP 541
EWA 4NEB 812 6188-02