Parameter Value Write - Allen-Bradley 1203 Series User Manual

B–4 Supported Block Transfer Messages

Parameter Value Write

0
PLC request 4
Drive response 4
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com
Parameter Value Write writes a 16-bit parameter data value to the
selected parameter number.
PLC Block Transfer Instruction Data
PLC request instruction length: 4 word
Drive response instruction length: 4 words
Figure B.4
PLC Request
Message Length
4
PLC Decimal Value
–31999
Parameter Number
➀
Parameter Data
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
1 2 3
–31999 20* 4096*
769 20* 0*
➀
For parameter values greater than 32,767, you may need to enter the value in hexadecimal.
* Example only — These values vary depending on parameters and products.
Message Structure
Message Length
Header Word 0
PLC Decimal Value
Header Word 1
769 — Message OK
–31999 — Message Error
Parameter Number
Data Word 2
0 or Error Code
Data Word 3
4 5 6
Drive Response
Header
4
Word 0
Header
Word 1
Data
Word 2
Data
Word 3
7 8 9