Rockwell Automation 900 Temperature Controller Communications Functions - Series B - Manual (Page 26)

Publication 900-UM004D-EN-E - July 2010
2-10 Bulletin 900 Communications Procedures 900-TCx (CompoWay/F)
Write to Variable Area
This service writes to the controller’s variable areas.
• Variable Type and Write Start address
For details on variable types and write start addresses, refer to Chapter 3,
Communications Data.
• Bit position
Bit accessing is not supported on the 900-TCx controller. Fixed to 00.
• Number of elements
Table 2.10
Number of Elements Process
0000 The write operation is not performed (do not
append write data to the service request PDU)
and processing ends in normal completion.
Double word 0001…0018 (1…24) The write operation is performed and processing
ends in a normal completion.
Word 0001…0030 (1…48)
Write Data
(for number of elements)
Number of elements x 8 or 4
Number of
Elements
4
Bit
Position
0 0
2
Write Start
Address
4
Variable
Type
2 2
0 0 2
2
1
MRC SRC
Service Request PDU:
Service Response PDU:
MRC SRC Response
Code
0 0 1 2
2 2 4