Profile Of Modbus - ABB REM 610 Technical Reference Manual

1MRS755537
5.1.14.1.
Motor Protection Relay
Technical Reference Manual - ANSI Version
The data address range in the Modbus network follows the protocol
definition and starts from 0.3. Consequently, the data addresses in
Table 5.1.14.1.-5...Table 5.1.14.1.-13 are decreased by one when
transferred over the network.
The Modbus data type digital input (DI) is commonly also referred to
as 1X, coils as 0X, input register (IR) as 3X and holding register (HR)
as 4X, of which the former is used here. Thus, HR 123, for instance,
can also be referred to as register 400123.

Profile of Modbus

The Modbus protocol (ASCII or RTU) is selected via the HMI and can be used only
through the rear connection of the relay on the optional communication module.
Modbus line settings, that is, parity, CRC byte order and baud rate, can be adjusted
either via the HMI or the SPA bus.
The implementation of the Modbus protocol in REM 610 supports the following
functions:
Table 5.1.14.1.-1 Supported application functions
Function code
01
02
03
04
05
06
08
15
16
23
Function description
Read coil status
Reads the status of discrete outputs.
Read digital input status
Reads the status of discrete inputs.
Read holding registers
Reads the contents of output registers.
Read input registers
Reads the contents of input registers.
Force single coil
Sets the status of a discrete output.
Preset single register
Sets the value of a holding register.
Diagnostics
Checks the communication system between the
master and the slave.
Force multiple coils
Sets the status of multiple discrete outputs.
Preset multiple registers
Sets the value of multiple holding registers.
Read/write holding registers
Exchanges holding registers in one query.
REM 610 REM 610
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