ABB AC500 PLC - 1.7.4.1.8 Diagnosis and State LEDs; Structure of the Diagnosis Block

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
2019/04/17 3ADR010121, 13, en_US 903