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Communication extension card
-13-
Bits 15
–
00
Task or response identification flag
0
–
7
Second word PKW2 (16 bits)
Bits 15
–
00
Basic parameter address
0
–
247
Third word PKW3 (16 bits)
Bits 15
–
00
Value (most significant word) of a
parameter or error code of the
returned value
00
Fourth word PKW4 (16 bits)
Bits 15
–
00
Value (least significant word) of a
parameter
0
–
65535
Note:
If the master station requests the value of a parameter, the values in PKW3 and PKW4 of the packet
that the master station transmits to the VFD are no longer valid.
Task request and response: When transmitting data to a slave, the master uses a request number, and the
slave uses a response number to accept or reject the request.
describes the request and response
functions.