Rockwell Automation 1395 Multi-Comm Hardware/Software - Manual (Page 55)

Chapter 3
Configuration & Interfacing
3–44
Write Parameter Data
This function writes parameter value(s) to the Drive. The Drive can accept
up to 30 parameters in one block transfer write when using the RIO write
mechanism. The DH+ message can only write one parameter per message.
PLC Block Transfer Data –
BTW Instruction Length: See below
BTR Instruction Length: See below
PLC DH+ Data –
Write Read
Size In Elements: 6 6
Processor Type: PLC–5 PLC–5
Destination Address: N15:0–5 N15:0–5
Message Structure –
Message Header Information:
Word 1: 0
Word 2: 0
Function Code, Word 3: 515
Write Message Length, Word 4: See examples
WORD
BTW BTR
0
0
515
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–H. The low byte contains the Drive
message length in bytes.
5
6
Parameter #
Parameter Status
Parameter #
Parameter Status
Parameter #
•
Parameter Status
0
0
515
See Examples
Parameter #
Parameter Data
Parameter #
Parameter Data
Parameter #
•
Parameter Data
7
8
•
xx
RIO
DH+ DH+
RIO
Message Operation – The WRITE PARAMETER DATA function
requests the Drive to change the value of the parameters specified in the
message to the value contained in the message. The values must be sent to
the Drive in Drive units and may need to be scaled by the PLC Controller
prior to being sent. Up to 30 parameters may be changed in a single block
transfer.