4. Faults and diagnostics
4−33
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
Structure of an entry in the diagnostic memory
Time stamp
Days in
operation
milliseconds of
the day
Event Diagnostic code Additional
information
determines meaning
determines meaning
PNU 222 PNU 202 PNU 200 PNU 201 PNU 203
int32 int32 int32 int32 int32,
(bit−encoded)
Number of days in
operation
Number of milli
seconds of the day
Diagnostic event Diagnostic number Additional in
formation for FCT
Tab.4/7: Structure of diagnostic memory entry
Parameter
Description
Time stamp
PNU 202
PNU 222
Time of the diagnostic event since the delivery status, reset device data or
firmware download in milliseconds.
PNU 222 contains the number of days
PNU 202 contains the number of milliseconds of the day
The time stamp is not a real−time clock: The time is read from the device
data (PNU 140) when the message occurs. The CMAX counts the period of
operation.
When switching off, the current time (refer to PNU 140:02) is saved, and
retrieved when switching on.
Diagnostic event
PNU 200
Type of diagnostic message.
Not only fault messages are entered into the diagnostic memory, but also
switch−on operations, resets or configuration events.
The interpretation of the diagnostic code and the additional information
depends on the type of these events.
Diagnostic number
PNU 201
The diagnostic number contains a detail on the diagnostic event. In the
event of faults and warnings this is the exact fault number, in the event of
configuration event it is the function performed etc.
Additional information
PNU 203
Detailed information on the fault. The evaluation is complex and therefore
suitable for a PLC program to a limited extent only. For description see
section 4.3.3.
Tab.4/8: Parameters of the diagnostic memory
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