Allen-Bradley Bulletin 1203 Series User Manual page 59

Parameter Value Read
PLC request N10:10
N10:90
Drive response
The Parameter Value Read function reads the 16–bit parameter data
value for the selected parameter number.
PLC Block Transfer Emulation Instruction Data
PLC request instruction length: 3 words
Drive response instruction length: 1 word
Message Structure
PLC Request
Message Length
3
PLC Decimal Value
769
Parameter Number
(See Drive List)
Message Operation
Parameter Value Read reads parameter values from the drive and
places that value (or an error code) in word 1 of the drive response
data file. The value is shown in device units. Device units are listed
in the user manual for the device you are using.
If an error occurs:
Word 1 of the response contains the status code.
The status area of the data file is non–zero.
Example
In this example, the value of parameter 20 was requested from a
1336 PLUS and a value of 4096 was returned. 4096 is the internal
drive unit value for the Maximum Rated Voltage Parameter. This
corresponds to a value of 100% Drive Rated Volts in Display Units.
Data File Format
0 1 2
3 769 20*
4096*
* Example only – These values vary depending on parameters and products.
Block Transfer Emulation Instructions
Header Word 1
Parameter Value or
Header Word 2
Header Word 3
3 4 5
Drive Response
Data
Status Word
Word 1
6 7 8
1203–5.5 September 1995
5–11
9