Rockwell Automation 2711E PanelBuilder 1400e Modbus Communications - Manual (Page 51)

6–14 Defining Tags
Publication 2711E-6.12 – August 1997
4. Fill in the fields as outlined below:
Security
This field is reserved for RSView databases. You cannot enter
anything in the Security field.
Description
Type a description of this tag up to 128 characters long.
Number of Bits
Enter a number from 1 to 1024 to define the length of the block.
The tag’s address must start on a word boundary, e.g. 00001,
00017, 00033, and the number of bits must be a multiple of 16.
Initial Value
Enter a 1 or 0 to initialize the entire block to 1 or 0 (i.e., all bits 1
or all bits 0). When a tag is used with a PanelBuilder input object
or function, this initial value is written to the controller when the
application first executes.
Note: For the PanelView terminal to write default values to the
controller, you must choose No for “Use Default Operation,” on
the terminal’s Application Startup screen, and you must cycle
power to the terminal. Default values are written to the controller
whenever you subsequently cycle power to the terminal.
5. To fill in the fields for data source, see
Specifying a Data
Source,” next.
Addressing Syntax
For block 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).
No bit offsets are supported.
4
word
read and write
4wwww where
wwww = word offset 0001 to 9999 (decimal).
No bit offsets are supported.
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