Vacon 20 User Manual

Communications vacon • 13
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
6
6. COMMUNICATIONS
Features of the Modbus-Vacon interface:
• Direct control of VACON
®
drive (e.g. Run, Stop, Direction, Speed reference, Fault reset)
• Full access to all VACON
®
parameters
• Monitor VACON
®
status (e.g. Output frequency, Output current, Fault code)
6.1 Modbus address area
The Modbus interface of VACON
®
20/X uses the ID numbers of the application parameters as
addresses. The ID numbers can be found in the parameter tables described in specific Application
Manual.
When several parameters / monitoring values are read at a time, they must be consecutive.
11 addresses can be read and the addresses can be parameters or monitoring values.
NOTE: With some PLC manufacturers, the interface driver for Modbus RTU communicationmay
contain an offset of 1 (the ID number to be used would then subtract 1).
6.2 Supported Modbus Functions
The VACON
®
variables and fault codes as well as the parameters can be read and written from
Modbus. The parameter addresses are determined in the application. Every parameter and actual
value have been given an ID number in the application. The ID numbering of the parameter as well
as the parameter ranges and steps can be found in the application manual in question. The
parameter value must be given without decimals. If several parameters/actual values are read with
one message, the addresses of the parameters/actual values must be consecutive.
Table 7. Modbus RTU
Fun c tio n
(dec)
Function Name Address
Broadcast
messages
3 Read Holding Registers All ID numbers No
4 Read Input Registers All ID numbers No
6 Write Single Register All ID numbers Yes
16 Write Multiple Registers All ID numbers Yes

Vacon 20 Specifications

General

Communication Options	Modbus, CANopen, PROFIBUS, Ethernet
Protection Class	IP20
Power Range	0.25 to 18.5 kW
Control Method	Scalar control, Vector control
Ambient Temperature	-10°C to +50°C