Position Contents
254 Position of the earliest diagnostic message of type “error”
255 Number of diagnostic messages in the malfunction list
Tab. 114: Structure of malfunction lists
Overflow of a malfunction list
Each malfunction list has up to 40 entries. If there are more entries, there is a differentiation between
the type of entry.
If the oldest entry is a warning, this entry is removed from the list.
However, if the oldest entry is an error, the list is frozen. If several errors or subsequent error occur one
after another, this ensures that the first (and possibly the causal) error cannot be removed from the
list.
Example of a malfunction list
The table below shows possible content of a malfunction list. This contains 3 malfunction messages.
The most recent malfunction message at position 1 is classified as an error.
Position Contents Value dec. Meaning
1 01|000000|00001010 1 | 0 | 10 Active error | malfunction subcode 0 |
short circuit in one of the connected sen-
sors on input module 1
2 11|000100|01001110 3 | 4 | 78 Warning | malfunction subcode 4 | PLC
command invalid
3 11|000101|01001110 3 | 5 | 78 Warning | malfunction subcode 5 | PLC
command invalid
… 00|000000|00000000 0 | 0 | 0 No malfunction message
40 00|000000|00000000 0 | 0 | 0 No malfunction message
41 … 252 00|000000|00000000 0 | 0 | 0 Not used
253 00 000000 00000001 1 The most recent error message is at posi-
tion 1
)
254 00 000000 00000001 1 The oldest error message is at position
1
1)
255 00 000000 00000011 3 There are 3 malfunction messages in the
malfunction list
1) The newest and oldest error message are identical in this example; there is only 1 error message in the malfunction list.
Tab. 115: Example of a malfunction list
3.8.3.4
What happens when an error occurs
When an error occurs, the valve is brought to a stop (status of the valve (valve state) = 3 (failure)).
If the cause of the error is no longer present, the valve status changes to "not ready" (valve state = 0
(not ready)).
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