Rockwell Automation 1336T ControlNet Frn1.02 Rev 1.5 - Manual (Page 63)

4–21 Using Unscheduled Messaging
Publication 1336 FORCE–5.18 ––March, 1999
The Scattered Parameter Value Write function writes to a list of
parameters and returns the status of each parameter in its value
location. Parameter numbers do not need to be in consecutive order.
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
-32765
Header
Word 2
Data
Word 3
PLC Decimal Value
3 –– Message OK
-32765 –– Message Error
Number of Parameter
Values to Write
Parameter Number
1
Number of Parameter
Values to Write
Parameter
Number 1
Parameter Number
2
Parameter Number
3
• •
• •
Parameter Number
30
Bit 15
Parameter
Number 2
Bit 15
Parameter
Number 3
Bit 15
•
•
Parameter
Number 30
Bit 15
Parameter Value or
Status Word 30
Parameter Value
2
Parameter Value
1
Parameter Value
3
Parameter Value
30
Status Word 1
Status Word 2
Status Word 3
Message Structure
Data
Word 4
Data
Word 5
Data
Word 6
Data
Word 7
Data
Word 8
Data
Word 9
Data
Word 62
Data
Word 63
Header
Word 2
Data
Word 3
•
•
Data
Word 4
Data
Word 5
Data
Word 6
Data
Word 7
Data
Word 8
Data
Word 9
Data
Word 62
Data
Word 63
0
PLC Request –– PLC Message Write
Drive Response –– PLC Message Read
Parameter Write
Scattered Parameter Value Write