Modbus
5.3 Variable Area
5-7
5.3 Variable Area
The variable area is the region of memory used to exchange data with
the E5CN/AN/EN/GN 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.
Note: Operation commands do not use the variable area.
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.
• Four-byte Mode
• Two-byte Mode
◆ Modbus Addresses Corresponding to CompoWay/F Setup Areas 0
and 1
E5CN/AN/EN/GN
Microcomputer
Variable area
Read/write
Operation
commands, etc.
Address (2 bytes)
Area number (00 to 13)
Address in area (00 to FE): 128 variables
Word identifier (0 to 3)
AAAA
0 0AA*****000
A
123456
Address (2 bytes)
Area number (20 to 33)
Address in area (00 to 7F): 128 variables
Word identifier (0 to 3)
0*****100 AAAA
0
AA
A
123456
To Next Page
Loading...
Need help?
General
