Parameter value write, Plc block transfer emulation instruction data, Message operation – Rockwell Automation 1203 Serial Communications Module Series B User Manual
Page 60: Example
5–12
1203–5.5 September 1995
The Parameter Value Write message writes a 16–bit parameter data
value to the selected parameter number.
PLC Block Transfer Emulation Instruction Data
PLC request instruction length: 1 word
Drive response instruction length: 4 words
Header
Word 1
Message Structure
Header
Word 2
Data
Word 3
PLC Request
Data Word 1
Message Length
Parameter Value
PLC Decimal Value
769 –– Message OK
–31999 –– Message Error
Parameter Number
Drive Response
4
Data
Word 4
Status Word
Message Operation
The Parameter Value Write function sends a new value to the
specified parameter. The value must be in device units. Units for
each parameter are listed in the device manual.
If an error has occurred, word 2 of the response returns a value of
–31999, and 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% Drive Rated Volts, as
defined in P147, Drive Rated Volts.
Data File Format
0
N10:0
N10:90
1
2
3
4
5
6
7
8
9
4
–31999
20*
4
769
20*
0
* Example only – These values vary depending on parameters and products.
4096*
PLC request
Drive response
Parameter Value Write