VACON CX Modbus user’s manual Page 19
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Vacon Oy Phone +358-201-2121 Fax: +358-201-212 205
7.3.4 Parameter Write and Read
Parameters can be read by using the function code 3 and written by using the function code 6. Modbus
address according to parameter numbers as follows.
Modbus address Vacon parameter group Vacon parameter number
40000 - 40099 Reference 1 - 99
40100 - 40199 Group 1 1 - 99
40200 - 40299 Group 2 1 - 99
. .
. .
49800 - 49899 Group 98 1 - 99
49900 - 49999 Group 0 1 - 99
Numbering of the parameter as well as parameter ranges and steps can be found in the application
manual in question. The parameter value should be given without decimals.
Example 1: Write value 25 to Vacon parameter 3.2
Response is an echo of the query.
Query:
01 06 01 2D 00 19 CRC16
Slave addr Function Address HI Address LO Data HI Data LO 2 bytes
Response:
01 06 01 2D 00 19 CRC16
Slave addr Function Address HI Address LO Data HI Data LO 2 bytes
Example 2: Read value of Vacon parameter 1.2
Response: Value of parameter 1.2
Query:
01 03 00 65 00 01 CRC16
Slave addr Function Address HI Address LO Number of
points HI
Number of
points LO
2 bytes
Response:
01 03 02 00 32 CRC16
Slave addr Function Byte count Value HI Value LO 2 bytes
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