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Communication extension card
-15-
PKW1 PKW2 PKW3 PKW4
CW
PZD2
PZD3
... PZD12
Reques
t
00 01 00 10 00 00 00 00 xx xx xx xx xx xx
...
xx xx
0001: Requesting to read a parameter value
0010: Parameter address
Response (VFD -> master station)
PKW1 PKW2 PKW3 PKW4
CW
PZD2
PZD3
…
PZD12
Response 00 01 00 10 00 00 50 00 xx xx xx xx xx xx
…
xx xx
5000: Parameter value in address 10
0001: Response (parameter value updated)
Example 2: Modifying the value of a parameter (on both RAM and EEPROM)
You can set PKW1 to 4 and PKW2 to 10 to modify a frequency set through keypad (the address of the
frequency set through keypad is 10), and the value to be modified (50.00) is in PKW4.
Request (master station -> VFD)
PKW1 PKW2 PKW3 PKW4
CW
PZD2 PZD3
…
PZD12
Reques
t
00 04 00 10 00 00 50 00 xx xx xx xx xx xx
xx xx
Response (VFD-> master station)
PKW1 PKW2 PKW3 PKW4
CW
PZD2 PZD3
…
PZD12
Response 00 01 00 10 00 00 50 00 xx xx xx xx xx xx
…
xx xx
0001: Response (parameter value updated)
PZD examples: The transmission of the PZD zone is implemented through VFD function code settings. For
the function codes, see the related ASTRAADA VFD operation manual.
Example 1: Reading the process data of a VFD
In this example, PZD3 is set to "8:
Rotating speed of the running
" through the VFD parameter
P15.14. This
operation sets the parameter forcibly. The setting remains until the parameter is set to another option.
Response (VFD -> master station)
PKW1 PKW2 PKW3 PKW4
CW
PZD2 PZD3
…
PZD12
5000: Parameter value in address
004: Parameter value to be modified