Rockwell Automation 1395 ControlNet Communication Board - Manual (Page 33)

3–19 Configuration & PLC Interfacing
Publication 1395–5.37– March, 1999
Read Parameter Data This function reads a parameter value from the Drive based on a
parameter number list provided by the PLC Program.
PLC Block Transfer Instruction Data –
Write Read
Size In Elements: 5 6
Processor Type: PLC-5 PLC-5
Destination Address: N40:0-4 N40:0-5
Message Structure –
0
PLC Message Write PLC Message Read
NOTE: Word 4 of the PLC Message Read instruction is broken down
into two bytes. The High byte contains the status bits
The Low byte contains the Drive message length in bytes.
Header
Word 1
0
Function Code
514
Message Length
See Examples
Header
Word 2
Header
Word 3
Header
Word 4
Data
Word 5
Parameter #
0
Header
Word 1
0
Function Code
514
See Note
Header
Word 2
Header
Word 3
Header
Word 4
Data
Word 5
Parameter #
Message Operation – The READ PARAMETER DATA function
requests the Drive to provides a parameter data value for use in the
PLC Controller. The value is returned in Drive units and may need to
be scaled by the PLC Controller prior to being used in the Program.