Scattered Parameter Value Read - Allen-Bradley 1203 Series User Manual

B–10 Supported Block Transfer Messages
Scattered Parameter Value
Read
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Scattered Parameter Value Read reads a scattered list of
parameters.
PLC Block Transfer Instruction Data
PLC request instruction length: 5 – 64 words
Drive response instruction length: 5 – 64 words
Figure B.7 Message Structure
PLC Request
Message Length
Header Word 0
5 – 64
PLC Decimal Value
Header Word 1
3
Number of Parameter Header Word 2
Values to Read
Parameter Number Data Word 3
1
0 Data Word 4
Parameter Number Data Word 5
2
0 Data Word 6
Parameter Number Data Word 7
3
0 Data Word 8
•
•
•
•
•
•
Parameter Number Data Word 62
30
0 Data Word 63
Message Operation
Scattered Parameter Value Read reads a pre-defined group of
parameter values, in any order, from the device. You define the
number of parameters to read in word 2 of the request. The
parameters to be read and their order is defined starting with word 3.
An unused word is left between each parameter request, so the drive
can respond with the parameter value, as shown.
Drive Response
Message Length
5 – 64
PLC Decimal Value
3 — Message OK
–32765 — Message Error
Number of Parameter
Values to Read
Parameter Number
bit
15
Parameter Value or
Error Code
Parameter Number
bit
15
Parameter Value or
Error Code
Parameter Number
bit
15
Parameter Value or
Error Code
•
•
3
•
•
•
•
Parameter Number
bit
15
Parameter Value or
Error Code
30
Header
Word 0
Header
Word 1
Data
Word 2
Data
1
Word 3
Data
Word 4
1
Data
2
Word 5
Data
Word 6
2
Data
3
Word 7
Data
Word 8
•
•
•
•
•
•
• •
• •
• •
Data
30
Word 62
Data
Word 63