5 Configuring Communication Connections
A-157
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 01/2007
C79000-G8976-C182-07
Messages in the Diagnostic Buffer
As a result of FETCH/WRITE access, negative acknowledgments from the S7
CPU are possible. This then leads to corresponding connection-oriented entries in
the diagnostic buffer that you can read out with NCM Diagnostics (see Section
8.5).
Table 5-8 Message Coding in the Diagnostic Buffer with FETCH/WRITE
Coding
Meaning
01
H
Hardware fault
03
H
Object access is not permitted.
05
H
Invalid address (syntax ID, area, type, bit number)
06
H
Data type not currently supported
07
H
Data type is not consistent.
0A
H
The object does not exist or the end of the area has been excee-
ded.
FF
H
Internal protocol error
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