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Automation Community > Blog > PLC > Difference Between PLC and HMI
PLC

Difference Between PLC and HMI

Editorial Staff
Last updated: 2023/04/29 at 7:57 AM
Editorial Staff
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In this article, you will learn the difference between Programmable Logic Controller (PLC) and Human Machine Interface (HMI).

Contents
PLCHMIKey DifferencesDifference Between PLC and HMIConclusion

PLC

A PLC is designed to handle industrial field inputs and outputs and can be programmed to perform complex control algorithms such as PID control and motion control. PLCs are typically programmed using ladder logic, function block diagrams, or structured text.

HMI

An HMI is a user interface that allows operators to interact with and control industrial processes. HMIs are designed to provide a user-friendly interface for monitoring and controlling industrial processes and are often used in conjunction with PLCs. HMI typically uses graphics, touch screens, and keypads for the user interface.

Key Differences

PLC and HMI are both used in industrial automation systems, but they serve different purposes.

  • Purpose: PLCs are used to control specific processes within an industrial setting, such as machinery on a factory floor. HMIs are used to provide an interface between a human operator and the process being controlled by the PLC.
  • Control: HMIs are used to display process data and allow the operator to input commands, but they do not directly control the process. PLC receives input from sensors and process that data using a program, and then send output to actuators to control the process.
  • Communication: HMIs are connected to the PLC and are used to display process data but HMI does not communicate directly with the process being controlled. PLC directly controls the process using standard industrial communication protocols.
  • Complexity: PLCs are typically more complex than HMIs, as they are responsible for controlling the process and making decisions based on input from sensors and commands from the operator. HMIs are simpler, as they are only responsible for displaying the data and allowing the operator to input commands.

Difference Between PLC and HMI

Difference Between PLC and HMI
PLCHMI
PLC is designed for industrial automation and controlHMI is designed for operator interface
PLC uses ladder logic, function block diagrams, or structured text for programmingHMI uses graphics, touch screens, and keypads for user interface
PLC can handle high-speed inputs and outputsHMI used for monitoring and controlling process variables
PLC can be programmed to perform complex control algorithmsHMI displays real-time process data and provides alarms and alerts
PLC communicates via industrial protocols such as Modbus, Profinet, and Ethernet/IPHMI communicates with PLC and other devices via industrial protocols or OPC
Examples: Allen-Bradley, Siemens, Mitsubishi ElectricExamples: Allen-Bradley PanelView, Siemens Simatic HMI, Pro-face GP4000 Series
PLC is used in a wide range of industries, including manufacturing, process control, and building automationHMI is used in conjunction with PLC to provide a user-friendly interface for monitoring and controlling industrial processes
PLC is programmed to perform complex control algorithms, such as PID control and motion controlHMI is used to display real-time process data to make adjustments to the process
PLC can be configured for remote access and monitoringHMI provides historical data logging and reporting capabilities
PLC integrated with other industrial devices, such as sensors and actuatorsHMI supports multiple languages, allowing for easy operation by operators from different countries
PLC used for safety applications, such as emergency stop and interlockingHMI is used for accessing the data from the safety logic.
PLC is used in harsh industrial environments with wide temperature ranges and exposure to dust and vibrationTypically HMI is designed for indoor use in a controlled environment
PLC can be used in stand-alone or networked configurationsHMI can be integrated with PLC and SCADA systems for monitoring purposes
PLC program may be password protected to restrict the unauthorized accessHMI can be configured to support user access levels and security measures to protect against unauthorized access or changes to the process
PLC can be configured for automatic or manual control of the processHMI can provide recipe management, allowing operators to easily switch between different process settings
PLC can be used to integrate with IT systems such as ERP, MES, and cloud-based platformsHMI can be configured to provide real-time notifications via email, SMS, or other messaging systems

Conclusion

A programmable Logic Controller is designed to control and automate industrial processes. Human-Machine Interface is a graphical user interface between PLC and human operators.

Read Next:

  • PLC and SCADA
  • Instructions in PLC
  • PLC versus Computer
  • Compare PLC and Relay
  • Top HMI Software List

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TAGGED: HMI, Human Machine Interface, PLC, Programmable Logic Controller

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