1.7.4.1.8 Diagnosis and state LEDs
Structure of the diagnosis block
Byte Number
Description
Possible Values
1
Diagnosis Byte, slot number 31 = CI521-MODTCP (e. g. error at inte-
grated 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
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.
Device specifications
Communication interface modules (S500) > Modbus
2022/01/31
3ADR010278, 3, en_US
755