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 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.
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.
◆ Modbus Addresses Corresponding to CompoWay/F Setup Areas 0
and 1
Setup area 0 and setup area 1 do not correspond directly to Modbus
addresses, but the following areas have a rough correspondence with
one exception.
* Partial Exception to Modbus Address Correspondence
The Hysteresis (heating), Hysteresis (cooling), Control period (heat),
and Control period (cool) parameters are assigned to consecutive
addresses, but the control period parameters are setup area 1 param-
E5CN
Microcomputer
Variable area
Read/write
Operation
commands, etc.
00
******
A6 A5 A4 A3 A2 A1 A0 0
Address (2 bytes)
Area number (00 to 3F) Address in area (00 to FE): 128 variables
Word identifier (0 to 3)
Setup area
Modbus addresses
Area number Address range
Setup area 0 00 to 0B 0000 to 0BFE
Setup area 1 0C to 3F 0C00 to 3FFE
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