Rockwell Automation 1336T PLC Comm. Adapter, Series B, FRN 2.xx-3.xx - Manual (Page 175)

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Publication 1336 FORCE–5.13 –– September, 1998
The Link Parameter Read message reads the source parameter
number that is linked to the specified sink parameter.
PLC Block Transfer Instruction Data
BTW instruction length: 3 words
BTR instruction length: 4 words
Message Length
3
Header
Word 1 Header
Word 1
PLC Decimal Value
2304
Header
Word 2
Header
Word 3
Header
Word 2
Header
Word 3
PLC Decimal Value
2304 –– Message OK
Sink Parameter Link
-30464 –– Message Error
0
Parameter Number
Data
Word 4
Message Structure
Source Parameter
Number
PLC Request –– Block Transfer Write
Drive Response –– Block Transfer Read
Message Operation
The Link Parameter Read function specified in the BTW reads the
source parameter that is linked to the requested sink parameter,
defined in word 3 of the header message. The source parameter is
returned in word 4 of the BTR.
If an error has occurred, word 2 of the BTR returns a value of
-30464.
Example
In this example, the link associated with parameter 101 was
requested from the drive. The BTW header message word 4 defines
the sink parameter of the requested link with a value of 101. The
linked source parameter 330 is returned in word 4 of the BTR.
1 0
N10:0
2 3 4 5 6 7 8 9
N10:90
BTW
Data File
BTR
Data File
Data Format
101 0
101 330
3
0
2304
2304
Link Read
Link Parameter Read