Rockwell Automation 1336T ControlNet Frn1.02 Rev 1.5 - Manual (Page 61)

4–19 Using Unscheduled Messaging
Publication 1336 FORCE–5.18 ––March, 1999
The Continuous Parameter Value Write function writes to a
continuous list of parameters beginning with the starting parameter
number.
PLC Block Transfer Instruction Data
PLC MSG Write instruction length: 5-64 words
PLC MSG Read instruction length: 5-64 words
Message Length
5-64
Header
Word 1 Header
Word 1
PLC Decimal Value
-32767
Header
Word 2
Data
Word 3
PLC Decimal Value
1 –– Message OK
Status Word
-32767 –– Message Error
Number of Parameter
Values to Write
Starting Parameter
Number
Number of Parameter
Values to Write
Starting Parameter
Number
Status Word
Status Word
•
•
Status Word
Value Number 1
Value Number 2
Value Number 3
• •
• •
Value Number 60
Message Structure
Data
Word 4
Data
Word 5
Data
Word 6
Data
Word 7
Data
Word 64
Header
Word 2
Data
Word 3
•
•
Data
Word 4
Data
Word 5
Data
Word 6
Data
Word 7
Data
Word 64
0
PLC Request –– PLC Message Write
Drive Response –– PLC Message Read
Message Operation
The Continuous Parameter Value Write function specified in the
PMW writes data values to a consecutive group of parameters,
beginning with the starting parameter number defined in word 4 of
the PMW message. The number of parameters to be written to is
defined in word 3 of the PMW message.
If an error has occurred in writing to any of the values, the PMR data
file status word contains an error code. If no error has occurred, it
returns a value of 0.
Parameter Write
Continuous Parameter Value
Write