Instruction Manual

6. Diagnosis and fault display
6−13
Festo P.BE−GDCP−SFC−LACI−PB−EN en 0812NH
6.4 Diagnostic memor y
The diagnostic memory contains the last 16 diagnostic
messages. It is backed up if possible in the event of power
failure. If the memory is full, the oldest element will be
overwritten (ring buffer).
Structure of the diagnostic memory
Parameters
1)
PNU 200 (20C8
h
) PNU 201 (20C9
h
) PNU 202 (20CA
h
) PNU 203 (20CB
h
)
Format uint8 uint16 uint32 uint32
Meaning Diagnostic event Fault number Time stamp Cycle number
Subindex 1 Current diagnostic message
Subindex 2 Previous diagnostic message
... ...
Subindex 16 Oldest diagnostic message
1)
See section B.3.5
Tab.6/8: Diagnostic memory: structure
Configuration of diagnostic memory with PNU 204/(20CCh)
SI Description Specifi
cation
Min Max
1 = 1: Record incoming and outgoing
*)
faults
= 2: Record only incoming faults
*)
Outgoing fault = Acknowledge the fault
1 1 2
2 = 1: Resolution time stamp 10 ms
= 2: Resolution time stamp 1 ms
1 1 2
3 Deleting the diagnostic memory
 Writing with value = 1 deletes the diagnostic memory
 Read will always reply with value = 1
0 0 1
4 Read the number of entries in the diagnostic memory 0 0 16
Tab.6/9: Diagnostic memory: configuration