Danfoss VLT Soft Starter MCD 600 Installationshandbuch - Seite 9
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Modbus RTU Card
Installation Guide
5 Modbus Registers
5.1 PLC Configuration
Use the tables in
5.5 Standard Mode
All references to registers mean the registers within the device unless otherwise stated.
5.2 Compatibility
The Modbus RTU Card supports 2 modes of operation:
•
In Standard Mode, the device uses registers defined in the Modbus Protocol Specification.
•
In Legacy Mode, the device uses the same registers as the clip-on Modbus Module supplied by Danfoss for use with older soft
starters. Some registers differ from those specified in the Modbus Protocol Specification.
5.3 Ensuring Safe and Successful Control
Data written to the device remains in its registers until the data is overwritten or the device is reinitialized.
If the soft starter should be controlled via parameter 7-1 Command Override or should be disabled via the reset input (terminals
RESET, COM+), fieldbus commands should be cleared from the registers. If a command is not cleared, it is resent to the soft starter
once fieldbus control resumes.
5.4 Parameter Management
Parameters can be read from and written to the soft starter. The Modbus RTU Card can read or write a maximum of 125 registers in 1
operation.
The total number of parameters in the soft starter may vary according to the model and parameter list of the soft starter. At-
tempting to write to a register not associated with a parameter returns an error code 02 (illegal data address). Read register 30602
to determine the total number of parameters in the soft starter.
Do not change the default values of the Advanced parameters (parameter group 20-** Advanced Parameters). Changing these val-
ues may cause unpredictable behavior in the soft starter.
5.5 Standard Mode
5.5.1 Command and Configuration Registers (Read/Write)
Table 2: Description of Read/Write Registers
Register
Description
40001
Command (single write)
Danfoss A/S © 2022.11
to map registers within the device to addresses within the PLC.
N O T I C E
N O T I C E
N O T I C E
Bits
Details
0–7
To send a command to the starter, write the required value:
00000000 = Stop
00000001 = Start
00000010 = Reset
00000100 = Quick stop (coast to stop)
00001000 = Forced communication trip
00010000 = Start using Parameter Set 1
00100000 = Start using Parameter Set 2
01000000 = Reserved
Modbus Registers
AQ277154312778en-000201 / 175R1180 | 9