SECTION 5 Modbus Communications Procedure
5-8
eters. For this reason, an operation error will occur when writing the
control period (heating or cooling) from the setup area 0 side, e.g., from
the operation level.
● Number of Elements The number of elements is expressed in 2-byte hexadecimal. The
setting range for the number of elements varies according to the
command.
For example, when the number of elements is “0010,” this specifies
eight items of data (H’10) from the address.
In Modbus protocol, one element occupies 2 bytes of data, but the
setting data occupies 4 bytes of data.
● Set Values The values read from the variable area or written to the variable area
are expressed in hexadecimal, ignoring the decimal point position.
(Negative values are expressed in 2’s complement format.)
Example: D’105.0 → H’0000041A
The variables are 8-digit hexadecimal values. Negative values are
expressed in 2’s complement format. The values are hexadecimal
values with no decimal point indication.
For example, when the E5CN’s process value is 105.0, the read value is
H’0000041A (105.0
→ 1050 → H’0000041A).
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