Byte Number Description Possible Values
1 Diagnosis Byte, slot
number
31 = CI502-PNIO (e. g. error at integrated
8 DI / 8 DO)
1 = 1st connected S500 I/O Module
...
10 = 10th connected S500 I/O Module
2 Diagnosis Byte, module
number
According to the I/O bus specification
passed on by modules to the fieldbus
master
3 Diagnosis Byte, channel According to the I/O bus specification
passed on by modules to the fieldbus
master
4 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
5 Diagnosis Byte, flags According to the I/O bus specification
Bit 7: 1 = coming error
Bit 6: 1 = leaving error
6 Reserved 0
In cases of short circuit or overload, the digital outputs are turned off. The modules performs
reactivation automatically. Thus an acknowledgement of the errors is not necessary. The error
message is stored via the LED.
For diagnosis firmware version
³
3.2.6 is required.
Communication Interface Modules (S500) > Modbus
2019/04/173ADR010121, 13, en_US930
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