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106 •
Programmable Field Bus Controller 750-833
Acyclic Communication According to DP/V1
The error message "invalid slot" is generated when addressing modules that
are neither physically nor virtually (projected as not being connected)
available.
When reading from indices (MSAC1/2_Read), the maximum PDU length that
can be set is 240 bytes. The bus coupler/controller returns the actual amount of
information from the respective index.
When writing to indices (MSAC1/2_Write), the maximum possible length of
information to be written to the respective index must not be exceeded.
Otherwise, the error message "invalid length while writing!" is reported by
the bus coupler/controller.
Coding of Error Messages
Octet 1
Bit
7
Octet 2
Bit
7
Octet 3
Bit
7
Octet 4
Bit
7
Abb. 3.10.2-13: Coding of error messages
Octet 2
Error Decode
0 ... 127
128
129 ... 254
255
Bit
Bit
Bit
Bit
Bit
Bit
6
5
4
3
2
1
Bit
Bit
Bit
Bit
Bit
Bit
6
5
4
3
2
1
Bit
Bit
Bit
Bit
Bit
Bit
6
5
4
3
2
1
Bit
Bit
Bit
Bit
Bit
Bit
6
5
4
3
2
1
Meaning
Reserved
PROFIBUS-DP/V1
Reserved
PROFIBUS-FMS
Bit
0
Service
Error_Frame
Bit
0
Error_Decode
Bit
0
Error_Code_1
Error_Class
Bit
0
Error_Code_2
User specific
g012121e
WAGO-I/O-SYSTEM 750
Bus System
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