Structure Of The Slave Diagnosis; Length And Start Addresses Of The Diagnostic Blocks In S7 Standard Operation And In Redundant Operation - Siemens Simatic 6ES7 157-0AD81-0 A0 Series Manual

Diagnostics Using the User Program
10.1

Structure of the slave diagnosis

Influencing factors
The structure of the slave diagnosis depends on whether the IM 157 is in S7
standard operation, in redundant operation on an S7-400H or in DP standard
master operation.
Diagnostic blocks in S7 standard operation and in redundant operation
The table below shows the length of the diagnostic blocks and their start
addresses in the diagnostic frame.
Table 10-1 Length and start addresses of the diagnostic blocks in S7 standard operation and in
redundant operation
Diagnostic block
Standard diagnosis
Module diagnosis
Module status
Status message
H Status
Interrupt section
Total length
*) Only if interrupts are reported
Diagnostic blocks in DP standard master operation
As of version 4, when the IM 157 is being configured via the device master file,
each diagnostic block (except for the standard diagnosis) can be selected to be
present or not. The sequence of the diagnostic blocks is fixed. The start address of
the individual diagnostic blocks in the diagnostic frame depends on which
diagnostic blocks have been selected.
The table below shows the length of the diagnostic blocks and examples of their
start addresses in the diagnostic frame for certain configurations.
10-2
Length in bytes Start address in
non-redundant
6
31
63
60
8
(max. 63*)
(max. 223*)
Start address in
redundant mode
mode
0 0
6 6
37 37
100 100
– 160
(160*) (168*)
160 168
(max. 231*)
DP/PA Link and Y Link Bus Couplings
A5E00193841-01 1