ABB Ability™ Symphony® Plus MR Series

ABB Ability ™  Symphony ®  Plus MR Series

Product Overview and Core Positioning

Product definition: ABB's modular distributed control system (DCS), based on the Melody Rack, integrates controllers, I/O modules, and communication interfaces to provide a full process industrial automation solution from data acquisition and signal conditioning to closed-loop control and sequence control.

Core values:

Scalability: Suitable for different factory sizes, supports local/remote I/O combinations, and can expand modules as needed;

High availability: Inherent redundancy design (power supply, communication network, hardware), automatic fault switching, no additional configuration/wiring costs;

Convenience: Unified configuration, maintenance, and debugging are achieved through S+Engineering software, supporting online expansion and firmware download;

Compatibility: Seamless compatibility with old Melody series controllers (CMC 50/60/70, PM875/876), reusable old I/O modules, achieving "evolution without ambiguity".

Applicable scenarios: power generation (thermal power, new energy), water treatment, petrochemicals, public utilities and other industrial scenarios, especially suitable for critical task control and existing system upgrades.

Core components and key specifications

(1) Core parameters of controller (PM877)

Specific specifications of the project

Core functions include signal processing, closed-loop/open-loop control, sequence control, and complex operations (batch/advanced control)

Local I/O processing capability: up to 2000 (analog/digital mixed); Remote I/O (PROFIBUS): up to 6000

Redundant support for hot standby redundancy design, seamless takeover of backup controller in case of main controller failure

Running characteristics: Real time multitasking operating system, supporting 16 different cycle times

Special design without battery, reducing maintenance costs; Compliant with Network Security Standards (DSAC)

Time synchronization accuracy between controllers is 0.5ms

(2) I/O module types and characteristics

Module type:

Analog Input (CAI), Analog Output (CAO), Digital Input (CBI), Digital Output (CBO);

Temperature input (CTI), frequency input (CFI), control module (CAC/CBC), serial communication interface (CCF);

Supports Ex (intrinsic safety) and non Ex types, with some modules integrated with transmitter power supply.

Core features:

Each module is equipped with a built-in processor that supports 1ms resolution SOE timestamp, event detection, and alarm generation;

Integrated HART communication, HART variables can be directly used for functional planning;

Support online expansion and reconfiguration, hot swappable replacement in case of module failure (without disconnecting on-site cables);

Communication redundancy (Fnet bus), optional I/O module redundancy to ensure high availability.

(3) Communication interface and protocol support

Communication interface/protocol core specifications

PROFIBUS DP supports DPV0/DPV1/DPV2; Single controller with 2 lines, each supporting redundancy; Transmission rate: 9.6kbit/s~12Mbit/s

Modbus Modbus RTU (Local Interface Card); Modbus TCP (onboard), 128 servers/16 slaves

IEC 61850 supports access to Intelligent Electronic Devices (IEDs) and is compatible with electrical subsystem integration

HART is integrated into the I/O module, supporting device configuration and diagnostic information transmission

Control network redundancy high-speed serial network, support remote communication, no routing configuration required, easy to expand

Installation and deployment features

Installation method: Supports DIN rail installation, cabinet installation, and 19 inch rack installation. The three methods can be mixed and used in the same project to adapt to different factory structures;

Physical specifications: Module height of 7 units, front panel width of 8 or 16 rack units; Equipped with fault indicator LED and module selective protection;

Distributed deployment: Implementing local and remote I/O deployment through Fnet high-speed serial bus (supporting coaxial/fiber optic relay), reducing cable and installation costs;

Wiring design: The on-site cable is connected to the terminal unit, and the associated terminal unit is used for I/O redundancy configuration. Module replacement does not require disconnecting the on-site cable.

Engineering and maintenance tools

Core software: S+Engineering for Melody, providing a unified engineering workbench;

Software functions:

Configuration: Module configuration, control strategy design, built-in functional block library verified on site (supporting S88/NAMUR standards);

Maintenance: Fault diagnosis, firmware download, module replacement wizard, supporting multi-user collaboration and remote access;

Data management: Single database storage system configuration, supports multiple formats of data import/export, version control and rollback;

Old system upgrade: Supports replacing old controllers such as CMC 50/60/70, PM875 (- x)/PM876 (- x), etc. The old I/O modules (375kBaud/2Mbit cards) can be directly reused without changing the system topology and control logic.

Network architecture and operational characteristics

Network layering: divided into control network and operation network. The control network is responsible for real-time signal transmission and closed-loop control, while the operation network is responsible for visualization, configuration, and maintenance to avoid message congestion affecting control performance;

Signal interaction: The signal grouping function automatically establishes a bus connection between the signal source and the signal sink, actively cyclically transmitting signals without the need for additional configuration;

Diagnostic capability: The controller regularly performs hardware and firmware integrity diagnostics, and automatically reports abnormal states to the HMI or alarm collection software;

Scalability: The expansion rack can add up to 8 local I/O interfaces, expand the Fnet network through repeaters, and connect more MR series controllers.