Rockwell Automation 1395 Node Adapter Board - Manual (Page 34)

Chapter 3
Functional Description
3-22
Read Parameter Data This function reads a parameter value from the Drive based on a parameter
number provided by the PLC Program.
PLC Block Transfer Data –
BTW Instruction Length: 5
BTR Instruction Length: 40
Message Structure –
Message Header Information:
Word 1: 0
Word 2: 0
Function Code, Word 3: 514
Write Message Length, Word 4: 10 bytes
WORD
0
0
514
0
BTW (SETUP) BTR (RETURNED DATA)
0
0
514
See Note
1
2
3
4
NOTE: Word 4 of the BTR instruction is broken down into
two bytes. The High byte contains the status bits
per table 3.B. The low byte contains the Drive
message length in bytes.
Parameter # 5
6
Parameter #
Parameter Data
RIO RIO
Message Operation – The READ PARAMETER DATA function requests
the Drive to provide 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.