Rockwell Automation 1336T ControlNet Frn1.02 Rev 1.5 - Manual (Page 55)

4–13 Using Unscheduled Messaging
Publication 1336 FORCE–5.18 ––March, 1999
The Scattered Parameter Value Read function reads a scattered list of
parameters with each parameter you define. You must also define
the number of parameters to be read.
PLC Block Transfer Instruction Data
PLC MSG Write instruction length: 5-63 words
PLC MSG Read instruction length: 5-63 words
Message Length
5-63
Header
Word 1 Header
Word 1
PLC Decimal Value
3
PLC Decimal Value
3 –– Message OK
-32765 –– Message Error
Number of Parameter
Values to Read
Parameter Number
1
Number of Parameter
Values to Read
Parameter
Number 1
Parameter Number
2
0
Parameter Number
3
0
0
• •
• •
Data
Word 62
Parameter Number
30
0
Data
Word 63
Bit 15
Parameter Value or
Status Word 1
Parameter
Number 2
Bit 15
Parameter Value or
Status Word 2
Parameter
Number 3
Bit 15
Parameter Value or
Status Word 3
• •
• •
Data
Word 62
Data
Word 63
Parameter
Number 30
Bit 15
Parameter Value or
Status Word 30
Message Structure
Header
Word 2
Data
Word 3
Data
Word 4
Data
Word 5
Data
Word 6
Data
Word 7
Data
Word 8
Data
Word 9
Header
Word 2
Data
Word 3
Data
Word 4
Data
Word 5
Data
Word 6
Data
Word 7
Data
Word 8
Data
Word 9
0
PLC Request –– PLC Message Write
Drive Response –– PLC Message Read
Parameter Read
Scattered Parameter Value Read