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.