Diagnostics
7.4 Diagnostics with STEP 7 on PROFIBUS DP
M200D PROFIBUS/PROFINET
158 Manual, 08/2014, A5E01577426A/RS-AA/004
Channel-specific diagnostics
Definition
Channel-specific diagnostics provides information about channel faults in modules (in this
case: motor starters) and provides details of the identifier-related diagnostics. Channel-
specific diagnostics begin after the module status. The maximum length is limited by the
maximum total length of slave diagnostics of 62 bytes. Channel-specific diagnostics do not
affect the module status. Up to 9 channel-specific diagnostics messages are possible (see
also station status 3, bit 7).
Channel-specific diagnostics
Channel-specific diagnostics are structured as follows:
Figure 7-6 Structure of channel-specific diagnostics
Channel-specific diagnostics is always updated up to the current diagnostics message in the
diagnostics message frame. Subsequent, older diagnostics messages are not deleted.
Remedy: Evaluate the valid, current length of the diagnostics message frame:
• STEP7 from the parameter RET_VAL of SFC 13.
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