2.Profile Of Modbus Rem 610 - ABB REM 610 Technical Reference Manual

REM 610
4.1.14.2.
66
Motor Protection Relay
Technical Reference Manual
Note!
The data address range in the Modbus network follows the protocol definition and
starts from 0.3. Consequently, the data addresses in table 4.1.14.2-5 will be
decreased by one when transferred over the network.
Note!
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
will be used here. Thus, HR 123, for instance, can also be referred to as register
400123.
Profile of Modbus REM 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, i.e. 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 4.1.14.2-1 Supported application functions
Function code (HEX)
01
02
03
04
05
06
08
0F
10
17
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.
1MRS 752263-MUM