Parameter Value Read - Allen-Bradley 1203 Series User Manual

Parameter Value Read

0
PLC request 3
Drive response 4
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Parameter Value Read reads the 16-bit parameter data value for the
selected parameter number.
PLC Block Transfer Instruction Data
PLC request instruction length: 3 words
Drive response instruction length: 4 words
Figure B.3
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 3 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 3 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 drive and a value of 4096 was returned. 4096 is the internal
drive unit value for Maximum Rated Voltage. This corresponds to a
value of 100% Drive Rated Volts in Display Units.
Data File Format
1 2 3
769 20*
769 20* 4069*
* Example only — These values vary depending on parameters and products.
Supported Block Transfer Messages
Message Structure
Header Word 0
Message Length
Header Word 1
PLC Decimal Value
769=OK –31999=Error
Header Word 2
Parameter Number
Parameter Value or
4 5 6
B–3
Drive Response
Header
4
Word 0
Header
Word 1
Header
Word 2
Data
Error Code
Word 3
7 8 9