Rockwell Automation 1336T ControlNet Frn1.02 Rev 1.5 - Manual (Page 122)

4–80 Using Unscheduled Messaging
Publication 1336 FORCE–5.18 ––March, 1999
The Trend Parameter Definition allows you to read the list of trend
parameter numbers from the database.
PLC Block Transfer Instruction Data
PLC Message Write instruction length: 3 words
PLC Message Read instruction length: 13 words
Header
Word 1 Header
Word 1
Header
Word 2 Header
Word 2
Header
Word 3
Trend Number
Message Structure
Header
Word 3
Trend Number
PLC Decimal Value
4102
PLC Decimal Value
4102 –– Message OK
–28666 –– Message Error
Message Length
3 Message Length
13
PLC Request –– PLC Message Write
Drive Response –– PLC Message Read
Data
Word 4
Data
Word 5
Data
Word 6
Post Samples
Trend Sample Size
Trend Status
Parameter Number
Parameter Number
Parameter Number
Data
Word 7
Data
Word 8
Data
Word 9
Mode
Sample Time Rate
Operator Data
Parameter Number
Parameter Number
Parameter Number
Data
Word 10
Data
Word 11
Data
Word 12
Sampling Input
Comparison B
Comparison A
Parameter Number
Parameter Number
Parameter Number
Data
Word 13
Trend Output
Parameter Number
Trend File
Trend Parameter Definition