VACON CX Modbus user’s manual Page 17
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Vacon Oy Phone +358-201-2121 Fax: +358-201-212 205
7.3 VACON parameters
The Vacon variables and parameters can be read and written by using the following function codes and
addresses:
Modbus Address Modbus Register Function code Vacon Par/Var Access rights
40000 - 40099 40001 - 40100 3, 6 References R/W
40100 - 49999 40101 - 49100 3, 6 Parameters R/W
30000 - 30099 30001 - 30100 4 Variables R
30100 30101 4 Fault Code R
7.3.1 Frequency reference
If the Modbus master is the active control source, the frequency reference can be changed by using the
function code 6 or read by using the function code 6. Modbus address according to reference as follows.
Modbus address Range Step Default
40000 Par 1.1 - Par 1.2 0,01 Hz 0,00 - 50,00 Hz
The reference value should be given without decimals (e.g. ref. 10 Hz -> value 1000)
Example 1: Set frequency reference value 10,00 Hz to Vacon CX.
Response is an echo of the query.
Query:
01 06 00 00 03 E8 CRC16
Slave addr Function Address HI Address LO Data HI Data LO 2 bytes
Response:
01 06 00 00 03 E8 CRC16
Slave addr Function Address HI Address LO Data HI Data LO 2 bytes
7.3.2 Monitoring variables
Monitored item can be read by using the function code 4. Modbus address according to monitored item
numbers as follows.
Modbus address Vacon variable
30000 n1
30001 n2
. .
. .
30099 n99
Number Data name Step Unit Description
n1 Output frequency 0,01 Hz Frequency to the motor
n2 Motor speed 1 rpm Calculated motor speed
n3 Motor current 0,1 A Measured motor current
n4 Motor torque 1 % Calculated actual torque/nominal torque of the unit
n5 Motor power 1 % Calculated actual power/nominal power of the unit
n6 Motor voltage 1 V Calculated motor voltage
n7 DC-link voltage 1 V Measured DC-link voltage
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