Goodrive30 Series VFD Communication protocol
-137-
Read input of
high-speed pulse 2
PLC and current step
of multi-step speed
-300.0–300.0% (Unit:
0.1%)
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 VFD. 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 VFD).
Eight high-order
bits of code
Eight low-order
bits of code
Note: A device code consists of 16 bits, with eight high-order bits and eight low-order bits.
Eight high-order bits indicates the motor series, and eight low-order bits indicates the
derivative model.
7.4.3 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.
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