ABB Ability ™ Symphony ® Plus MR series (Melody Rack) control system

(2) Redundancy guarantee and seamless switching

The controller adopts a "hot standby" redundancy design, which does not require additional configuration or wiring:

The main controller and backup controller operate synchronously with the same control strategy and process data;

If the main controller fails, the backup controller immediately takes over control, achieving "disturbance free switching" and ensuring system availability (high average time between failures).

Standardized communication and network architecture

(1) Multi level communication network

The MR series adopts a layered and functionally segmented network architecture to ensure real-time control and operational flexibility. The specific levels are as follows:

Technical characteristics of core functions at the network level

Control the network to achieve real-time signal interaction between controllers and between controllers and I/O modules, closed-loop control and protection signal transmission redundant high-speed serial network, no routing configuration required, supports remote communication, and is not affected by operational layer message traffic

Operate network connection engineering workstations (S+Engineering), operation workstations (S+Operations), and system servers to transmit visual data, configuration information, and maintenance instructions, supporting simultaneous access by multiple users

Fieldbus interface docking with third-party devices and intelligent electronic devices (IEDs) supports PROFIBUS DP (DPV0/DPV1/DPV2), Modbus RTU/TCP, IEC 61850 (electrical subsystem integration)

(2) Key communication interface capability

PROFIBUS DP: A single controller supports 2 PROFIBUS lines, each line can be redundant, the transmission rate is adjustable from 9.6kbit/s to 12Mbit/s, supports PROFIBUS-DP/PA converters, and is compatible with Ex area devices;

Modbus: The local interface card provides Modbus RTU, and the controller has built-in Modbus TCP. A single controller supports 128 Modbus TCP servers and 16 Modbus TCP slaves, making it easy to interface with third-party instruments PLC；

IEC 61850: Intelligent Electronic Devices (IEDs) that directly integrate electrical subsystems without the need for additional gateways, simplifying the integrated design of electrical and control systems in the field of power generation.

Efficient engineering tools and software support

(1) S+Engineering for Melody Engineering Platform

This platform is the core configuration tool of the MR series, which achieves efficient project management through a client server architecture. Its core advantages include:

Single source data management: System configuration information is stored in a single database, eliminating duplicate data entry, ensuring data consistency, and supporting import/export of common file formats (such as Excel);

Multi user collaboration: The configuration server supports simultaneous connection of 10 clients, and engineers can remotely debug (from loop level to controller basic functions), which is suitable for efficient progress in hot debugging and project closure stages;

Version and Lifecycle Management: Integrated version control, version comparison, and rollback functions, supporting offline engineering design to avoid the impact of online modifications on production; Support replacing old modules (such as CMC 50/60/70, PM875/876) with new modules (such as PM877) without changing the existing topology and control logic;

Function Block Library: Provides a powerful function block library that has been verified on site, covering simple controls (such as MAX/MIN, 2 out of 3 logic), complex controls (such as polygon curves, batch formulas), supports user-defined function block libraries, and is programmed based on IEC 61131-3 standard Sequential Function Diagram (SFC).

(2) On site equipment integration

Through standardized FDT/DTM (Field Device Tool/Device Type Manager) interfaces, on-site devices can be "plug and play", and configuration and diagnostic information can be transmitted to the system layer through the control network, supporting asset optimization and device management applications.

System compatibility and lifecycle advantages

1. Backward compatibility and smooth upgrade

The MR series follows ABB's "evolution without exclusion" philosophy to ensure compatibility between old and new systems

Hardware compatibility: New I/O modules and controllers (such as PM877) are compatible with previous generation modules (such as CMC series) in terms of installation size and functional interfaces. Existing I/O cards can be retained for use (supporting 375kBaud and 2Mbit cards);

Software support: S+Engineering for Melody provides a tool for replacing old modules, without the need to rewrite control logic. Simply update the firmware to extend new features (such as adding IEC 61850 interfaces);

Investment protection: Users can reuse the factory specific control strategies and operational processes accumulated by decks to avoid "starting over" during upgrades and reduce capital and labor costs.

2. Industry Applications and Case Scale

The MR series is widely used in the fields of power generation and water treatment. As of document release (2018):