Rockwell Automation 2711E PanelBuilder 1400e Modbus Communications - Manual (Page 49)

6–12 Defining Tags
Publication 2711E-6.12 – August 1997
Addressing Syntax
For string tags, the addressing syntax is as follows:
Addressing Syntax for Devices Using 5-digit Addressing:
Reference Operations Addressing Syntax
0 bit
read and write 0bbbb where
bbbb = bit 0001 to 9999 (decimal)
and bbbb must align on word boundaries
(e.g. 00001, 00017, 00033)
1 bit
read only 1bbbb where
bbbb = bit 0001 to 9999 (decimal)
and bbbb must align on word boundaries
(e.g. 00001, 00017, 00033)
3 word
read only 3wwww where
wwww = word offset 0001 to 9999 (decimal).
Bit offsets are not supported.
4 word
read and write 4wwww where
wwww = word offset 0001 to 9999 (decimal).
Bit offsets are not supported.
Addressing Syntax for Devices Using 6-digit Addressing:
Reference Operations Addressing Syntax
3 word
read only 3wwwww where
wwwww = word offset 00001 to 65535 (decimal).
Bit offsets are not supported.
4 word
read and write 4wwwww where
wwwww = word offset 00001 to 65535 (decimal).
Bit offsets are not supported.
Important: Because string tags with References 1 or 3 are
read-only, they can only be assigned to display objects
(e.g. Numeric Data Display). An error will be generated
when you validate the application if a tag with
Reference 1 or 3 has been assigned to an input object.
For more information about types of objects, see
Chapter 9, “Creating Objects,” in the PanelBuilder
1400e Configuration Software for Windows User
Manual, Publication Number 2711E-819.