What is Modbus Heartbeat?

Modbus is one of the most used industrial automation protocols. In this post, I will explain what a Modbus heartbeat is and how it is used. 

What is Modbus Heartbeat?

A heartbeat is either a bit or a holding register that changes state for external devices to tell that the industrial controller (mostly the PLC) is running. 

What is the main function of the Modbus Heartbeat?

The main function of the heartbeat is to facilitate the detection of communication problems in programming environments where the transport layer communication error information is unavailable.

This increments approximately every 5 to 10 seconds. It is the responsibility of the system integrator to notify plant personnel if a Modbus master (the PLC or DCS system) fails to communicate with the transmitter. This register can facilitate this notification.

How is Modbus Heartbeat implemented?

The implementation of a heartbeat depends upon the master and slave in question. For most master applications, a heartbeat can be any simple message that is sent out to each slave to ensure that even if they have nothing new to report, at least they are online and in communication.

The timer register in the master will be expecting the information every 5 seconds (some manufacturers have this time of 10 seconds).

The external device that is communicating with this device would compare over time to see if the register is changing. If it does not, then the external device would declare either a master failure or a comm fail.

In most of the applications, there is no need to implement the heartbeat. This is because most of the Modbus slave units do not respond to Modbus commands unless they are operating. In such cases, just use a normal Modbus Read function.

What is heartbeat in PLC?

A PLC heartbeat signal is a signal that is periodically sent by a programmable logic controller (PLC) to indicate that it is still functioning properly. The signal is used by the PLC’s watchdog timer to confirm that the PLC is running correctly.

Conclusion

The Modbus heartbeat is like a watchdog that will make sure that there is communication between the master and slave in a Modbus communication.

This bit or register is not widely used in industrial communication, as most slave devices will not respond to master queries if they are not in communication.

10 Characteristics of a Successful Engineer

Becoming an engineer is one of the proudest moments of my life, since I graduated, I have worked with engineers with different knowledge and skills; these are the most common characteristics of a successful engineer.

What is an engineer?

An engineer is a person who invents, designs, analyzes, builds, and maintains a variety of machines, structures, and systems.

They use science, technology, and math to improve aspects of life like travel and communication. Types of engineers include:

  • Chemical engineers
  • Civil engineers
  • Electrical engineers
  • Industrial engineers
  • Manufacturing engineers
  • Mechanical engineers
  • Network engineers
  • Project engineers
  • Quality engineers
  • Robotics engineers
  • Safety engineers
  • Software engineers

What are the Characteristics of a Successful Engineer?

Curiosity

I have a friend who is also an engineer who used to tell me to stay curious, and I agree with him that engineering is about knowing how things work; to keep being relevant, you need to have an insatiable curiosity.

Constant Improvement

Technologies, customer requirements, and how to do things change very fast, this is why as an engineer you need to be adaptable.

You need to constantly work to improve your skillset; you can do this by listening to feedback from your customers and colleagues, attending seminars, and reading.

Creativity and Innovation

To create solutions that will solve your customer’s problems, you need to be creative and innovative; you can use the current technologies to come up with unique innovations in your projects.

You do not necessarily have to invest in new technologies; you can just improve the ones that exist or combine two or more and make something amazing.

Problem-Solving

You know how the saying goes: if it were easy, everyone would be doing it. Engineers regularly encounter problems that must be overcome and solved. Successful engineers have good problem-solving skills that help them in these situations.

Good Soft Skills, Including Communication & Leadership

Good Soft Skills, Including Communication & Leadership

Improving your technical skills is important, but don’t forget soft skills, as they are important too.

This includes communication skills, presentation skills, leadership skills, and more. Successful engineers have these skills and continuously work to improve them.

Team Player

They say you are as good as your team, and this is true; most of your projects will require other people with different skills, and you need to be able to collaborate with them to succeed.

Mathematical and Analytical Abilities Plus Logical Thinking

This point is probably the most obvious engineering characteristic on this list, but it is still worth highlighting. Being a good engineer means being a logical thinker and having excellent analytical and mathematical abilities.

Attention to details

In engineering, beauty is often found in the details. It is where value is added to projects, errors are discovered before they become a problem, and the best innovations are found. It’s not surprising, then, that successful engineers pay attention to the details.

Embrace Change

Nothing stands still in engineering, so it’s important to be open to change. Just because something has been done a particular way for years doesn’t mean it can’t be improved. Successful engineers embrace new technologies, processes, and ways of thinking.

Optimistic

Engineers face challenges – it’s part and parcel of the job. Those challenges could be a complex problem that appears to be completely resistant to a solution, or an issue with a client that is difficult to fix. Remaining optimistic in the face of these challenges helps considerably.

Conclusion

That is it; those are the 10 characteristics of a successful engineer, how many of them do you have? let me know in the comment section below.