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VACON® 1000 Fieldbus Options
Operating Guide
#
Parameter name
V7
W7
U8
V8
W8
U9
V9
W9
U10
V10
W10
3.3 Communications
3.3.1 Features
Features of the Modbus-VACON
•
Direct control of the VACON
•
Full access to all the VACON
•
Monitor the VACON
status (for example, output frequency, output current, fault code)
®
3.3.2 Data Addresses in Modbus Messages
All data addresses in Modbus messages are referenced to zero. The first occurrence of a data item is addressed as item number zero.
For example:
•
The coil known as "Coil 1" in a programmable controller is addressed as "Coil 0000" in the data address field of a Modbus mes-
sage.
•
Coil 127 decimal is addressed as "Coil 007E hex" (126 decimal).
•
Holding register 40001 is addressed as register 0000 in the data address field of the message. The function code field already
specifies a "holding register" operation. Therefore the "4XXXX" reference is implicit.
•
Holding register 40108 is addressed as register 006B hex (107 decimal).
3.3.3 Supported Modbus Functions
The VACON
variables, fault codes, and parameters can be read and written from Modbus. The parameter addresses are determined
®
in the application. Every parameter and actual value have an ID number in the application. The ID numbering of the parameter and
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 9: Supported Functions
Function (dec)
Function (hex)
1
1
2
2
3
3
26 | Danfoss A/S © 2023.09
interface:
®
drive (for example, run, stop, direction, speed reference, fault reset)
®
parameters
®
Modbus Function Name
Read coils
Read Discrete Inputs
Read Holding Registers
Modbus
Function
Data
Address
Code
Format
346
3(Read)
Word
347
3(Read)
Word
348
3(Read)
Word
349
3(Read)
Word
350
3(Read)
Word
351
3(Read)
Word
352
3(Read)
Word
353
3(Read)
Word
354
3(Read)
Word
355
3(Read)
Word
356
3(Read)
Word
TCP/RTU
Access type
TCP only
Discrete (1 bit)
TCP only
Discrete (1 bit)
TCP and RTU
Register (16 bit)
AQ454734633756en-000101 / 172K1112
Modbus RTU/TCP
Data description
Address range (hex)
00000- 0FFFF
10000- 1FFFF
40000- 4FFFF
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