GD350A series high-performance multifunction VFD
-295-
reference source" (P09.00) to Modbus communication.
The following table describes the encoding rules of device codes (corresponding to the identification
code 2103H of the VFD).
Eight high-
order bits of
code
Meaning
Eight low-
order bits of
code
Meaning
01
GD
0x08
GD35 vector VFD
0x09
GD35-H1 vector VFD
0x0a
GD300 vector VFD
0xa0
GD350 vector VFD
0xa1
GD350-UL vector VFD
0xa2
GD350A vector VFD
9.4.6 Fieldbus scale
In practical applications, communication data is represented in the hexadecimal form, but hexadecimal
values cannot represent decimals. For example, 50.12 Hz cannot be represented in the hexadecimal
form. In such cases, we can multiply 50.12 by 100 to obtain an integer 5012, and then 50.12 can be
represented as 1394H (5012 in the decimal form) in the hexadecimal form.
In the process of multiplying a non-integer by a multiple to obtain an integer, the multiple is referred to
as a fieldbus scale.
The fieldbus scale depends on the number of decimals in the value specified in "Detailed parameter
description" or "Default value". If there are
n
decimals in the value, the fieldbus scale m is the
n
th
-
power of 10. Take the following table as an example, m is 10.
Function
code
Name
Description
Setting
range
Default
Modify
Wake-up-from-sleep
delay
0.0–3600.0s (valid
when P01.19 is 2)
0.00–3600.0
0.0s
○
Restart after power
failure
0: Disable
1: Enable
0–1
0
○
The value specified in "Setting range" or "Default" contains one decimal, so the fieldbus scale is 10. If
the value received by the upper computer is 50, the value of "Wake-up-from-sleep delay" of the VFD
is 5.0 (5.0=50/10).
To set the "Wake-up-from-sleep delay" to 5.0s through Modbus communication, you need first to
multiply 5.0 by 10 according to the scale to obtain an integer 50, that is, 32H in the hexadecimal form,
and then transmit the following write command:
