ABB REU 610, Техническое справочное руководство

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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.
5.1.15.2. Profile of Modbus REU 610
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 REU 610 supports the
following functions:
Table 5.1.15.2.-1 Supported application functions
Function
code
Function description
01 Read coil status
Reads the status of discrete outputs.
02 Read digital input status
Reads the status of discrete inputs.
03 Read holding registers
Reads the contents of output registers.
04 Read input registers
Reads the contents of input registers.
05 Force single coil
Sets the status of a discrete output.
06 Preset single register
Sets the value of a holding register.
08 Diagnostics
Checks the communication system between the master and the slave.
15 Force multiple coils
Sets the status of multiple discrete outputs.
16 Preset multiple registers
Sets the value of multiple holding registers.
23 Read/write holding registers
Exchanges holding registers in one query.
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REU 610
Voltage Relay
Technical Reference Manual - ANSI Version
1MRS755972