Rockwell Automation 1203-CN1 ControlNet Communications Module 1203-CN1 - Manual (Page 122)

Publication 1203-5.13 – February, 2002
F-4 Supported Emulated Block Transfer Commands: Parameter Value Write
Parameter Value Write Parameter Value Write writes a 16-bit parameter data value to the
selected parameter number.
PLC Block Transfer Emulation Instruction Data
PLC request instruction length: 4 word
Drive response instruction length: 4 words
Message Operation
Parameter Value Write 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 1 of the response returns a value of
-31999, and word 3 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
* Example only - These values vary depending on parameters and products.
Message Structure
Header Word 1
Data Word 2
PLC Request
Message Length
PLC Decimal Value
-31999 -- Message Error
Parameter Number
Drive Response
4
Data Word 3
Parameter Data
Header
Word 0
Header
Word 1
Data
Word 2
Message Length
PLC Decimal Value
769 -- Message OK
-31999 -- Message Error
Parameter Number
4
Data
Word 3
Status Word
Header Word 0
0 1 2 3 4 5 6 7 8 9
PLC request 4 -31999 20* 4096*
Drive response 3 769 20* 0