Trend file, Plc block transfer instruction data, Message operation – Rockwell Automation 1336T ControlNet Frn1.02 Rev 1.5 User Manual
Page 103: Example, Number of trends available
4–61
Using Unscheduled Messaging
Publication 1336 FORCE–5.18 ––March, 1999
The Number of Trends Available function indicates how many trend
files the drive supports.
PLC Block Transfer Instruction Data
PLC Message Write instruction length:
3 words
PLC Message Read instruction length:
3 words
Header
Word 1
Header
Word 1
Header
Word 2
Header
Word 2
Header
Word 3
Trends Available
Message Structure
Header
Word 3
0
PLC Decimal Value
4096
PLC Decimal Value
4096 –– Message OK
–28672 –– Message Error
Message Length
3
Message Length
3
PLC Request –– PLC Message Write
Drive Response –– PLC Message Read
Message Operation
You can use the Number of Trends Available function to request the
number of trends that the drive supports. This function always
returns 4.
Example
In this example, a message was sent to the drive to request the
number of trend files available. The drive response indicates that
four trend files are available.
1
0
N7:10
2
3
4
5
6
7
8
9
N7:90
PLC MSG
Write File
PLC MSG
Read File
Data Format
0
4
3
3
4096
4096
Trend File
Number of Trends Available