Rockwell-automation 900 Temperature Controller Communications Function Manual de usuario Pagina 64

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Publication 900-UM004D-EN-E - July 2010
4-6 Modbus Communications Procedure
Variable Area
The variable area is the region of memory used to exchange data with the
900-TC8, 900-TC16, or 900-TC32 through communications.
Operations such as reading the process value and Reading/Writing parameters
are performed on the variable area.
On the other hand, operation commands do not use the variable area.
Figure 4.5
When accessing the variable area, the position of a variable in the variable area
is specified with a word identifier, area number, and address in the area.
Addresses
An address is appended to each of the variable types. Express addresses in
2-byte hexadecimal and append them for the specified access size. Each
address is composed of a word identifier, area number, and address in the area.
Figure 4.6
900-TC8 or 900-TC16
Microcomputer
Variable area
Read/write
Operation
commands, etc.
Four-byte Mode
Two-byte Mode
Address (2 bytes)
Area number (00 to 13)
Address in area (00 to FE): 128 variables
Word identifier (0 to 3)
Address (2 bytes)
Area number (20 to 33)
Address in area (00 to 7F): 128 variables
Word identifier (0 to 3)
0
0
0* ****A6 A0
A1
A2A3
A4
A5 0
A
6
A0
A1
A2A3
A4
A5
0
0
*****
1
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