Structure Of The Status Bits - Festo CPX System Manual

5. Diagnostics and error handling

5.2.1 Structure of the status bits

5−12
Irrespective of the CPX bus node used, the CPX terminal pro
vides 8 status bits for displaying common diagnostic mess
ages (global error messages).
Status bits are configured like inputs. The input addresses,
which are to be assigned to status bits, depend on the field
bus protocol used (see manual for the specific CPX bus
node).
The status bits supply coded diagnostic information. Bits 0 to
3 specify the module types in which faults have occurred. Bits
4 to 7 specify the type of fault.
Bit Diagnostic information
with 1−signal
0 Error at valve
1 Error at output
2 Error at input
3 Error in analogue module/
function module or techno
logy module
4 Undervoltage
5 Short circuit/overload
6 Wire break
7 Other error
Tab. 5/3: Structure of the status bits
If all status bits supply a 0−signal, no fault will be registered.
Description
Module type in which an
error has occurred error has occurred
Type of error
Festo P.BE−CPX−SYS−EN en 0902e