Modular PLC and HMI are at the corner of the Automation systems to make the machineries and processes function optimally. Thus, let’s examine them, their functionalities, and their relation in simpler stances.
What is a PLC?
PLC is a type of a computer that assists in process control. This computer has the capability to receive input signals such as from sensors or switches and output signals to external devices such as motors, lights, or valves.
Why use a PLC?
- Computes many operations in seconds and in real life.
- It’s specially designed to operate in harsh and extreme situations such as factories and plants.
- Multiple processes can be programmed easily and utilized instantly.
Where being used PLCs are the following:
- Activating conveyor machines during production.
- Operating mechanical arms.
- Mechanizing the process of bagging produce.
What is an HMI?
This generally refers to any screen or interface through which a human can communicate with a machine. This screen displays data from the PLC that includes working and production rate of the machine and gives the operator the ability and authority to control the system.
What are some HMI functions?
- Displays information about the process in a visual format.
- Allows operatives to change the parameters of the machine operation.
- Warns the operator in case of some problems.
Where being used HMIs are the following:
- Watching over assembly lines.
- Changing or setting machine parameters or quantity of goods produced.
- Troubleshooting problems via the viewing of the alarms.
How Do PLC and HMI Work Together?
PLCs and HMIs work as a team:
- The PLC controls the machines.
- The HMI provides a way for humans to see and control what’s happening.
For example, in a food packaging plant: - The PLC ensures machines fill and seal bags accurately.
- The HMI lets operators see the number of bags packed and change settings if needed.
Why Are They Important?
- Efficiency: Automate repetitive tasks and reduce errors.
- Control: Operators can adjust processes in real time.
- Reliability: Built for long-term use in demanding environments.
Common Examples
- PLCs: Allen-Bradley, Siemens, Mitsubishi.
- HMIs: PanelView, SIMATIC HMI, Schneider Electric interfaces.
PLCs and HMIs are essential for smooth and efficient industrial automation. Together, they make it easier to control machines, monitor processes, and boost productivity.
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