ABB ControlMaster CM50 Universal process controller

ABB ControlMaster CM50 Universal process controller

Introduction

Recording and Control products can now be found via both the Measurement Products sales channels and the Control Systems essential automation product suite. This provides a whole new world of products that Recorders and Controllers can interact with.

For example, a plant using a plant-wide distributed control system (DCS) might have a requirement for a back up system in the event that something happens to the main control system. This document details how to configure a ControlMaster CM50 and a Freelance AC700F controller to enable the CM50 to take over and maintain control of a process in the event the AC700F fails.

Communication method

The ControlMaster range of universal controllers can connect and communicate with a Modbus system using either an Ethernet (Modbus TCP) or serial (Modbus RS485) connection. In this example, Modbus RS485 is used to communicate with the AC700F.

Key features

• A cost-effective solution using a well integrated engineering tool and operator interface (Control Builder F and DigiVis, respectively). 

• With little engineering effort and no additional wiring, the setpoint and auto/manual status can be synchronized using Modbus RS485 communications (only *.prt and *. hwm files are imported). 

• Transfer of control from the DCS to the CM50 is initiated by either a Modbus* Communication Failure or a DCS loop error. 

• It is possible to enable and disable local setpoint changes on the CM50 using the DCS control panel: 

– Enabled – setpoint cannot be changed locally 

– Disabled – local setpoint adjustment can be performed

• It is possible to change the control status of the CM50 (acting as Master or Backup) from the DCS control panel using Modbus Communications.

– M = manual (Backup) 

– A = auto (Master) 

• All information shown on the CM50’s display can be viewed on the DCS control panel (for example, process variable and setpoint). 

• In the event of the CM50 assuming control, the auto/manual and setpoint switch-over is performed to provide a bumpless transfer. 

• The CM50’s customizable display can show up to 6 variables, enabling display of 2 separate loops.

FUNCTION

Highly flexible and versatile:

Capable of meeting the needs of a wide range of industrial applications, the CM50 can be easily adapted to a variety of process control applications through its powerful control functions and highly scalable hardware and software capabilities.

Powerful control functions:

Provides adaptive control, mathematical and logical calculations and totalisation functions, offering flexible solutions for dealing with complex process control problems.

Intuitive operator interface:

The colour TFT display clearly presents detailed process information, simplifying configuration settings and operation. Users can complete full-featured configuration settings through the convenient navigation menu on the front panel or PC configuration software.

High Protection Rating:

IP66 and NEMA 4X protection ratings enable stable operation in harsh industrial environments, including washdown applications.

Communication and Integration Capabilities:

Supports MODBUS® bus and Ethernet communication options, ensuring that the controller can be easily integrated into existing control systems.