ABB M10 Series User Manual

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10. Communication interface
Overview
M10x supports three types of communication
protocol: MODBUS RTU, PROFIBUS DP and
MODBUS TCP.
MODBUS RTU
The physical fieldbus interface in M10x-M is
RS485. There are two identical RS485 interfaces
for redundant design. All functions are sup-
ported via RS485, eg, parameterization, control,
supervisions, etc.
The M10x-M implements a subset of the Modicon
MODBUS RTU serial communication standard.
MODBUS is a single master/multiple slave type of
protocol suitable for a multi-drop configuration
as provided by RS485 hardware. The M10x-M is al-
ways a MODBUS slave, and cannot be
programmed as a master. Commonly, computers
or PLCs serve as masters.
Both monitoring and control are possible using
read and write register commands. Other
commands are supported to provide additional
functions.
Modbus RTU network
All devices are connected in bus structure. In one
segment, up to 32 modules can be connected. At
the beginning and the end of one segment, the
cable is terminated with a resistor. The maximum
length depends on cable type and baud rate.
Function description
The following functions are supported by the
M10x-M: (FC=Function code)
FC02 Read settings and actual values
FC03 Read settings and actual values
FC04 Read settings and actual values
FC05 Execute operation
FC06 Store single setting
FC08 Loop back test
FC10 Store multiple settings
For more details on the M10x MODBUS,
refer to M10x-M MODBUS Protocol
Implementation.
86 M OT O R CO N T R O L A N D P R O TE C T I O N U N I T M 1 0X U S E R G U I D E

ABB M10 Series Specifications

General

Brand	ABB
Model	M10 Series
Category	Controller
Language	English