Rockwell Automation 1203 Serial Communications Module Series B - Manual (Page 59)

5–11 Block Transfer Emulation Instructions
1203–5.5 September 1995
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
Data
Word 1
PLC Decimal Value
769
Message Structure
PLC Request
Header Word 1
Header Word 2
Header Word 3
Parameter Value or
Message Length
Drive Response
Parameter Number
3
(See Drive List)
Status Word
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
N10:10
N10:90
1 2 3 4 5 6 7 8 9
3 769 20*
4096*
* Example only – These values vary depending on parameters and products.
PLC request
Drive response
Parameter Value Read