Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: Distributed Control System & Motor Control Center Interface Philosophy
Share
Notification Show More
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Control Systems > Distributed Control System & Motor Control Center Interface Philosophy

Distributed Control System & Motor Control Center Interface Philosophy

In this article, you will learn the basic interface philosophy between distributed control system (DCS) and motor control center (MCC).

Last updated: September 28, 2022 2:10 pm
Gaurav Lunagariya
Control Systems
No Comments
Share
4 Min Read
SHARE

In general, the exchange of signals between electrical systems (MCC) and Distributed Control systems (DCS) is implemented based on a plant control philosophy.

Contents
Distributed Control System Interface PhilosophyMotor Control Center Interface Philosophy

All signals for motor control and monitoring will be exchanged between DCS and MCC is exchanged on the Ethernet platform; it is called iMCC (Intelligent motor control center) to the extent possible or else if it is connected with simple hardware wiring then it is called non-iMCC (simply MCC).

Distributed Control System Interface Philosophy

In manufacturing industries, the following signals are commonly used in order to full fill the process requirement and atomization of the process.

  • Stop/Trip Command from DCS (Digital output)
  • Start Command from DCS (Digital output)
  • Run/Off Indication on DCS (Digital Input)
  • Trip Indication on DCS (Digital Input)
  • Current/Power Indication on DCS (Analog Input)
  • In the case of VFD, Output from DCS for speed set point and input to DCS to monitor the actual speed of the motor (Analog output)
  • Auto/manual or Remote/local selection of motor on DCS (Digital Input)
  • Emergency stop from field to DCS (Digital Input)
  • Auto/manual or remote/local indication of VFD on DCS (Digital Input)
  • Ready to start signal on DCS (Digital output)

Critical motor interlocks are implemented in the ESD system and non-critical motor interlocks of motors are implemented in DCS as per operation control philosophy.

Motor Control Center Interface Philosophy

Distributed Control System & Motor Control Center Interface Philosophy

Furthermore, if we use hardwire interface between MCC and DCS/PLC, then all the commands from DCS/PLC should be potential free with the switching of relay contact because generally 230 VAC is used in the control circuit of the motor feeder and indication feedback from MCC to DCS/PLC also remains potential free contact for protection of DCS/PLC cards.

There are analog signals used between VFD and DCS/PLC for the indication of Current (A) and Speed RPM on the DCS workstations and these are analog input signals (AI, 4-20 mA). Also, DCS/PLC sends the motor speed set point signal to VFD as analog output (AO) same as (4-20 mA).

VFD is also connected to DCS/PLC on the Modbus link and all required data is exchanged on this communication channel (optional).

If the motor is related to the critical equipment category as per process and interlock pertaining to the ESD system, then one interlock command signal is used for tripping the motor during abnormal operation this command signal comes from the ESD system.

In most industries, there is an IRP cabinet (Interposing Relay panel) installed in between the DCS/PLC system and Motor Control Center (MCC). This panel is installed in the control room. This is used for the isolation of different voltage signals and the protection of electronic cards mounted in DCS/PLC panels.

Thus, all the above control signals are used for the operation of motors in manufacturing industries, and during commissioning time, all signals are checked individually, and loop tests will be performed for each indication and command signal.

If you liked this article, then please subscribe to our YouTube Channel for Electrical, Electronics, Instrumentation, PLC, and SCADA video tutorials.

You can also follow us on Facebook and Twitter to receive daily updates.

Read Next:

  • Gas Metering System
  • Faults in PID Control Loop
  • Industrial System Checklist
  • Power Factor Controller (PFC)
  • Building Management System
Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

VFD Simulator Download – Free Yaskawa V1000 Software
Basic Concepts of the Safety Relay
Runaway Processes
Single Loop Controller Questions
Difference between Fieldbus, Profibus and HART Protocols
Problem in Water Level Control System
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Distributed Control System Interview Questions
Best Way to Build Troubleshooting Mindset for Automation Engineer
Remote Factory Acceptance Test
How to Write a Program in Ecostruxure Machine Expert HVAC Software?
What is DeviceNet?
Tuning a Liquid Level Process Control Loop
2-wire Transmitters Current Loops
Example of Feedback System

Keep Learning

Why Baud Rate is Important in Modbus Network

Why Baud Rate is Important in Modbus Network?

Quantitative PID tuning procedures

Quantitative PID tuning procedures

Adaptive Controller Overview

What is Adaptive Control?

Control Loops

Control Loops Objective Questions and Answers

Fixed Type Motor control center (MCC)

Motor Control Center (MCC) Signal Interface Termination (SIT)

Hot Well Level Control System in Condensing Turbine

Hot Well Level Control System in Condensing Turbine

Temperature Controller Problem

Temperature Controller Problem

High Integrity Pressure Protection System HIPPS

Overview of HIPPS System

Learn More

Turbine Control System

Turbine Control System

Power Electronics Objective Questions

Sequence Controller Objective Questions

Pressure-sensing level transmitter

Moving Pressure Sensing Level Transmitter from Top to Bottom

Stability in Frequency Domain

Mathematical Preliminaries

Basic Terms used in SIL Verification

Basic Terms used in SIL Verification

Electrical Machines Questions and Answers

Transformer Construction

pH Analyzers Questions and Answers

pH Meters Questions & Answers

Introduction to MEMS (Microelectromechanical Systems)

Introduction to MEMS (Microelectromechanical Systems)

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?