TECHTOP TD20 Series Product Manual page 106

TD20 Series VFD
the state information and relative function parameters of the VFD.
7.3.5.1 The rules of parameter address of the function codes
The parameter address occupies 2 bytes with the high bit in the front and the low bit in the rear. The
range of high and low byte are: high byte—00–ffH; low byte—00–ffH. The high byte is the group number
before the radix point of the function code and the low byte is the number after the radix point. But both
the high byte and the low byte should be changed into hex. For example P05.05, the group number
before the radix point of the function code is 05, then the high bit of the parameter is 05, the number after
the radix point 05, then the low bit of the parameter is 05, then the function code address is 0505H and
the parameter address of P10.01 is 0A01H.
Function
Name
code
Simple PLC
P10.00
means
Simple PLC
P10.01 memory
selection
Note: P29 group is the factory parameter which cannot be read or changed. Some parameters cannot
be changed when the VFD is in the running state and some parameters cannot be changed in any state.
The setting range, unit and relative instructions should be paid attention to when modifying the function
code parameters.
Besides, EEPROM is stocked frequently, which may shorten the usage time of EEPROM. For users,
some functions are not necessary to be stocked on the communication mode. The needs can be met on
by changing the value in RAM. Changing the high bit of the function code from 0 to 1 can also realize the
function. For example, the function code P00.07 is not stocked into EEPROM. Only by changing the
value in RAM can set the address to 8007H. This address can only be used in writing RAM other than
reading. If it is used to read, it is an invalid address.
7.3.5.2 The address instruction of other function in Modbus
The master can operate on the parameters of the VFD as well as control the VFD, such as running or
stopping and monitoring the working state of the VFD.
Below is the parameter list of other functions
Function
instruction
Communication
control command
Detailed instruction of parameters
0: Stop after running once.
1: Run at the final value after running once.
2: Cycle running.
0: Power loss without memory
1: Power loss memory.
Address
definition
0001H: forward running
0002H: reverse running
0003H: forward jogging
2000H
0004H: reverse jogging
0005H: stop
0006H: coast to stop (emergency stop)
Data meaning instruction
-104-
Communication Protocol
Default
Modify
value
○
0
○
0
R/W
characteristics
W