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USER MANUAL
10
Modbus TCP Interface (710-14812-00D)
8.
Modbus Registers
NOTE
The available features and parameter details may vary according to the model
and software version of the starter. Refer to the soft starter user manual for
details of parameters and supported features.
NOTE
All references to registers mean the registers within the interface unless
otherwise stated.
8.1
Compatibility
The Modbus TCP Interface supports two modes of operation.
•
In Standard Mode, the interface uses registers defined in the Modbus Protocol
Specification.
•
In Legacy Mode, the interface uses the same registers as AuCom's Modbus
Interface. Some registers differ from those specified in the Modbus Protocol
Specification.
The mode of operation is determined by the values of bit 15 in register 40001.
•
Standard Mode: set Bit 15 = 1. Bits 0~7 of register 40001 are used for command.
•
Legacy Mode: set Bit 15 = 0. The remaining bits of register 40001 are reserved.
Examples
10000000 00000001 = start the motor (Standard Mode).
10000000 00000000 = stop the motor (Standard Mode).
00000000 xxxxxxxx = switch to Legacy Mode. The interface will ignore the remaining
bits in register 40001 and will check the value in register 40002.
8.2
Parameter Management
Parameters can be read from and written to the starter. When writing parameters to
the soft starter, every parameter will be updated to match the values in the PLC.
CAUTION
Do not change the default values of the Factory parameters (parameter group
20). Changing these values may cause unpredictable behaviour in the soft
starter.