Communication extension card
-14-
Table 2-10 Task identification flag PKW1
Request No. (from the master to a slave)
Response signal
Request
No.
Function
Acceptance
Rejection
0
No task
0
–
1
Requesting the value of a parameter
1, 2
3
2
Modifying a parameter value (one
word) [modifying the value only on
RAM]
1
3 or 4
3
Modifying a parameter value (two
words) [modifying the value only on
RAM]
2
3 or 4
4
Modifying a parameter value (one
word) [modifying the value on both
RAM and EEPROM]
1
3 or 4
5
Modifying a parameter value (two
words) [modifying the value only on
both RAM and EEPROM]
2
3 or 4
The requests #2, #3, and #5 are not supported currently.
Table 2-11 Response identification flag PKW1
Response No. (from a slave to the master)
Response No.
Function
0
No response
1
Transmitting the value of a parameter (one word)
2
Transmitting the value of a parameter (two words)
3
The task cannot be executed and one of the following error
number is returned:
1: Invalid command
2: Invalid data address
3: Invalid data value
4: Operation failure
5: Password error
6: Data frame error
7: Parameter read only
8: Parameter cannot be modified during VFD running
9: Password protection
PKW examples
Example 1: Reading the value of a parameter
You can set PKW1 to 1 and PKW2 to 10 to read a frequency set through keypad (the address of the frequency
set through keypad is 10), and the value is returned in PKW4.
Request (master station -> VFD)