ABB Ability™ Symphony® Plus MR Series (Melody Rack) Overview

Overview

The MR Series includes a series of compact DIN

rail mounted controllers, a wide range of I/O

modules and modern, standardized fieldbus

interfaces. These modules offer all the

functions required for data acquisition and signal

conditioning, as well as powerful open loop

and closed loop control, sequence control and

monitoring. All process management

tasks are executed on the basis of integrated

complex control strategies. Without the need

for configuration, The MR Series inherent

redundancy design – including integrated

redundancy concepts for power supply,

communication and I/O – provides the highest

level of availability.

Key features include:

• A wide range of I/O interfaces with optionally

integrated intrinsic safety (Ex i) design and

transmitter power supply. Features such as

time stamping with a 1 ms resolution,

monitoring, filtering and HART communication

are implemented directly in the I/O modules

• PROFIBUS interfaces provide connections to

ABB’s S800 and S900 remote I/O stations in

Ex and non-Ex versions, as well as other PROFIBUS devices

• IEC 61850 interface to intelligent electronic

devices (IEDs) for the integration of electrical subsystems

• Modbus RTU and TCP interfaces provide

connections to 3rd party devices

• The MR Series control network uses a

redundant, high-speed serial communication

network with inherent capability for remote

communication. The network is easy to handle,

without requiring routing configuration

• Flexible mounting alternatives such as cabinet,

DIN rail or 19” rack mounting. All three can be

combined in one project. This allows optimal

adaptation to all plant structures and supports

flexible upgrades of existing installations

• An unrivaled high packing density in the

system cabinets saves installation space

• Controller time synchronization based on

a time precision of 0.5 msec

• Sequence of events (SOE) time stamping

with a resolution of 1 ms is implemented

in the controller and local I/O module level

The control subsystem includes flexible

communication options to I/O and intelligent

field devices via system buses. HART as well as

PROFIBUS information, including configuration

and diagnostic information, is communicated

via the control network. This information is

available to system controllers and system

level applications such as asset optimization

and device management. The comprehensive

bus concept of the system controller allows

for the easy integration of HART, PROFIBUS,

Modbus RTU and TCP field devices as well as

of PROFIBUS and IEC 61850 electrical assets.

The MR Series functional capabilities are

summarized in figure 2.