Rockwell Automation 1336T PLC Comm. Adapter, Series B, FRN 2.xx-3.xx - Manual (Page 159)

7–13
Publication 1336 FORCE–5.13 –– September, 1998
This message sent by the PLC Communications Adapter Board reads
the 16–bit parameter data value for the parameter number selected.
PLC Block Transfer Instruction Data
BTW instruction length: 4 words
BTR instruction length: 4 words
Message Length
4
Header
Word 1 Header
Word 1
PLC Decimal Value
-31999
Header
Word 2
Parameter Number
Data
Word 3
PLC Decimal Value
769 –– Message OK
Header
Word 2
Data
Word 3
Parameter Number
-31999 –– Message Error
Data
Word 4
Parameter Value
Data
Word 4
Message Structure
0
PLC Request –– Block Transfer Write
Parameter Value or
Status Word
Drive Response –– Block Transfer Read
Message Operation
The Parameter Value Write function specified in the BTW sends a
new value (specified in word 4 of the BTW header message) to the
parameter specified in the BTW header word 3. The value must be in
device units.
If an error has occurred:
•
Word 2 of the response returns a value of -31999.
•
Word 4 contains a status code.
Example
In this example, a value of 4096 was sent to parameter 20. 4096 is in
drive units and indicates a value of 100% of rated drive volts as
defined by parameter 147, Drive Rated Volts.
1 0
N10:10
2 3 4 5 6 7 8 9
N10:90
BTW
Data File
BTR
Data File
Data Format
20 4096
20 4096
4
0
-31999
769
➀ ➀
➀ ➀
➀ These values vary depending on parameters and products.
Parameter Write
Parameter Value Write