Diagnostics Using the User Program
10-4
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
10.2 Structure of the diagnostic blocks
10.2.1 Standard diagnosis
The standard diagnosis consists of 6 bytes and is subdivided as follows:
Byte 0
Byte 1 Station statuses 1 to 3
Byte 2
Byte 3
Byte 4
Byte 5
Device identifier
Master PROFIBUS address
Figure 10-1 Structure of the standard diagnosis
Station status 1 to 3
Station statuses 1 to 3 provide an overview of the status of the IM 157.
Table 10-3 Structure of station status 1
Bit
Meaning Cause/remedy
0 1: The IM 157 cannot be addressed by
the DP master.
Has the correct PROFIBUS address
been set on the IM 157?
Is the bus connector connected?
Voltage present at the IM 157?
1 1: The IM 157 is not yet ready to ex-
change data.
Wait while the IM 157 starts up.
2 1: The configuration data sent by the
DP master to the IM 157 does not
correspond to the configuration of
the IM 157.
Is the correct station type or correct
configuration of the IM 157 entered
in the configuration software?
3 1: External diagnosis available. (Group
diagnosis display)
Evaluate the module diagnosis, the
module status and/or the status
message. Bit 3 is reset as soon as all
faults have been rectified. The bit is
reset when there is a new diagnostic
message in the bytes of the
above-mentioned diagnoses.
4 1: The function requested is not sup-
ported by the IM 157 (e.g. SYNC and
FREEZE).
Check the configuration.
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