3. Diagnosti cs
3-12
Festo P.BE-CTEU-EC-OP+MAINT-EN en 1208NH
3.3.3 Diagnostics via emergency message
If an error occurs, the bus node will send an emergency
message (EM) with a defin ed structure ( Tab. 3/8) provided
that the “diagnostics” DIL switch is activated
( section 1.4.5).
Byte 0
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7
Error code Error
register
I-port 1 event code I-port 2 event code Diagnosis
number
Tab. 3/8: Structure of an emergency message (EM)
Note
If several emer gency messages from Tab. 3/9 are present,
only the most recently reported is transmitted to the mas-
ter controller.
The followi ng secti o ns describe the components of the emer-
gency message and the error causes
( Tab. 3/9 ... Tab . 3/11).
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