I/O System S900
Communication Interface for PROFIBUS DP, CI920
40 3BDD010422R0101
7..2 1..0
Octet 9
not used I/O module 16
000000 00: data valid
01: module error
10: wrong module
11: missing module
Identifier-specific diagnostics
One bit per slot (module) indicates, whether or not a diagnostic message
exists for the respective slot.
Table 4-8 Identifier-specific diagnostics
7..6 5..0
Octet 1
Header Length
01 000100 = 4
7 6 5 4 3 2 1 0
Octet 2 Slot 7 Slot 6 Slot 5 Slot 4 Slot 3 Slot 2 Slot 1 Slot 0
Octet 2 Slot 15 Slot 14 Slot 13 Slot 12 Slot 11 Slot 10 Slot 9 Slot 8
Octet 2 Slot 16
Channel-specific diagnostics
Three bytes are provided for every channel error. Only one error can be
reported for one channel in a block. If more than one error occur in a channel,
several blocks are put together.
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