Rockwell Automation 1395 Node Adapter Board User Manual

Page 29

Chapter 3
Functional Description

3-17

Only ONE parameter may be WRITTEN to or READ from the Drive via
the Node Adapter.

The BTW block has reserved 6 words starting at N111:5 for the block
transfer message. To perform a Write request, the message words must be
setup as shown below. Note: The data below is shown in hex.

Value of Parameter

N111 : 5

Word 1

N111 : 6

Word 2

N111 : 7

Word 3

N111 : 8

Word 4

N111 : 9

Word 5

N111 : 10

Word 6

Parameter Number

Length in Bytes

Status Byte

Class (Write Request)

Element (Parameter)

All values shown for the message words are given in Hex. Parameter 625
(0271 Hex) is being sent the value 2 (0002 Hex).

The data returned to the PLC Controller in the BTR block will appear in a
40 word file starting as word N111:50. A data file length of 40 for the BTR
is used to allow for internal status information.

Because the BTW request was a Parameter Write, the Node Adapter will
not return a data portion in the BTR message. Any data returned after the
length defined in the BTW should be ignored, this is internal status
information, and is not used. Information returned to the BTR block is as
follows:

N111 : 50