DRV-28 inverter
s Communication protocol
-270-
Function
Address
Data description
R/W
External length
3013H
0
–65535
R
External count value
3014H
0
–65535
R
Torque setting
3015H
-300.0
–+300.0% (unit: 0.1%)
R
Identification code
3016H
R
Fault code
5000H
R
The Read/Write (R/W) characteristics indicate whether a function can be read and written. For
example, "Communication-based control command" can be written, and therefore the command code
6H is used to control the inverter. The R characteristic indicates that a function can only be read, and
W indicates that a function can only be written.
Note:
Some parameters in the preceding table are valid only after they are enabled. Take the running
and stop operations as examples, you need to set "Running command channel" (P00.01) to
"Communication", and set "Communication running command channel" (P00.02) to the Modbus
communication channel. For another example, when modifying "PID setting", you need to set "PID
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 inverter).
8 MSBs
Meaning
8 LSBs
Meaning
01
DRV
0x08
Reserved
0x09
Reserved
0x0a
DRV-27 vector inverter
0xa0
DRV-28 vector inverter
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
Detailed parameter description
Default
value
P01.20
Wake-up-from-sleep delay 0.0–3600.0s (valid when P01.19
is 2)
0.0s
P01.21
Restart after power cut
0: Restart is disabled
1: Restart is enabled
0
The value specified in "Detailed parameter description" or "Default value" contains one decimal, so
the fieldbus scale is 10. If the value received by the upper computer is 50, the value of
