Rockwell Automation 1336-GM1 Remote I/O Communications Module - Manual (Page 74)

B–10 Supported Block Transfer Messages
Scattered Parameter Value
Read 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
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.
Header
Word 0
PLC Decimal Value
3 Header
Word 1
Data
Word 2
PLC Request
Header Word 0
Header Word 1
Header Word 2
Message Length
Message Length
PLC Decimal Value
3 — Message OK
–32765 — Message Error
Number of Parameter
Drive Response
Number of Parameter
5 – 64
Values to Read
0
Data Word 3
Data Word 4
Data Word 5
Parameter Number
Parameter Number
1
2
Parameter Number
3
Data Word 6
Data Word 7
Data Word 8
0
0
Data Word 62 Parameter Number
30
Data Word 63 0
5 – 64
Values to Read
Data
Word 3
Data
Word 4
Data
Word 5
Parameter Number
Parameter Value or
Parameter Number
1
2
Data
Word 6
Data
Word 7
Data
Word 8
Parameter Value or
Parameter Value or
bit
Error Code
1
Error Code
2
Parameter Number
3
Error Code
3
15
bit
15
bit
15
Data
Word 62
Data
Word 63
Parameter Value or
Parameter Number
30
Error Code
30
bit
15
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