B–20 Supported Block Transfer Messages
Fault Queue Size Read
Fault Queue Size Read gets the number of fault entries allowed in
the fault queue.
PLC Block Transfer Instruction Data
PLC request instruction length: 3 words
Drive response instruction length: 4 words
Figure B.13 Message Structure
Message Operation
Fault Queue Size Read reads back the size of the fault queue
available in the product. Each product may have a different number of
fault queue entries available for storage.
If an error has occurred, word 1 of the response returns a value of
-30975.
Example
In this example, a 1336 PLUS drive was used. This product has a fault
queue of four storage locations available to store faults. This value is
seen in word 3 of the response header message.
Data File Format
* Example only — These values vary depending on parameters and products.
Header
Word 0
PLC Decimal Value
1793
Header
Word 1
Header
Word 2
PLC Request
Header Word 0
Header Word 1
Header Word 2
Message Length
Message Length
PLC Decimal Value
1793 — Message OK
–30975 — Message Error
0
Drive Response
3
0
4
Data
Word 3
Fault Queue Size
or Error Code
0123456789
PLC request 3 1793 0
Drive response 4 1793 0 4*
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