1.7.2.3.10 Structure of the Diagnosis Block of the DC551-CS31
If a DC551-CS31 module is connected via a CS31 bus, then the field bus master receives diag-
nosis information by an extended diagnosis block. The following table shows the structure of
this diagnosis block:
Byte
number
Description Possible values
1 Data length (header included) 18
2 Diagnosis byte 0 = Communication with DC551-CS31
OK
1 = Communication with DC551-CS31
failed
3 DC551-CS31 diagnosis byte, module
number
0 = DC551 (e.g. error at the integrated
8DI/16DC)
1 = 1st attached S500 I/O module
...
7 = 7th attached S500 I/O module
4 DC551-CS31 diagnosis byte, slot According to the I/O bus specification
passed on by modules to the fieldbus
master
5 DC551-CS31 diagnosis byte,
channel
According to the I/O bus specification
passed on by modules to the fieldbus
master
6 DC551-CS31 diagnosis byte, error
code
According to the I/O bus specification
Bit 7 and bit 6, coded error class
0 = E1
1 = E2
2 = E3
3 = E4
Bit 0 to bit 5, coded error description
passed on by modules to the fieldbus
master
7 DC551-CS31 diagnosis byte, flags According to the I/O bus specification
Bit 7: 1 = coming error
Bit 6: 1 = leaving error
Bit 5: 1 = Diag reset
Bit 2 to bit 4: reserved
Bit 1: 1 = explicit acknowledgement
Bit 0: 1 = static error
Passed on by modules to the fieldbus
master
Value = 0: static message for other sys-
tems, which do not have a coming/
leaving evaluation
8ff Reserved
Communication Interface Modules (S500) > CS31
2019/04/17 3ADR010121, 13, en_US 819
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