What Is The Difference Between PLCs and PACs?

For newcomers to the world of manufacturing technology, it may be confusing to know what the difference is between PLCs and PACs.

Programmable Logic Controllers (PLCs) and Programmable Automation Controllers (PACs) are industrial computers designed for the manufacturing industry. All automated systems, no matter industrial the sector, are built with one of these two types of computers.

They can control individual machines and stations, as well as groups of machines or stations. Therefore, there is a place for both in the automated manufacturing sector.

But why are there two types and how do they differ? We believe in making the understanding of and use of automation technology simple. So we compiled this short guide to help you understand the difference between these two champions of the industrial sector.

What Is A PLC?

A Programmable Logic Controller or PLC is an industrial computer that is programmed using Ladder Logic. It is suitable for simple processes and small automation projects.

What Is A PLC Capable Of?

A PLC is capable of controlling basic as well as high-speed machines. It is a cost-effective option for automation control at a simpler level. Most automated manufacturing plants can operate very efficiently with a PLC.

Advanced PLCs

That said, modern models are equipped for high-speed I/O, sequencing, and proportional-integral derivative control as well as either digital or analog I/O.

Also, many PLCs have built-in networks enabling them to communicate with other PLCs and better distribute I/Os. These advanced PLCs can communicate between Human Machine Interfaces (HMI) and Supervisory Control and Data Acquisition (SCADA) systems.

The Industrial Internet Of Things (IIoT)

You may be familiar with the term Internet Of Things (IoT). Well, there is an industrial application as well. The Industrial Internet of Things aims to increase productivity and product quality.

It also reduces operational costs by reducing human intervention while offering more safety for those workers who are necessary to operations. Reducing the need for workers keeps operating costs low, providing more safety without sacrificing performance.

What Is A PAC?

A Programmable Automation Controller is a more intricate industrial computer, using C or C++. It is suitable for more complex and larger-scale automation projects. 

What Is A PAC Capable Of?

A PAC is ideal for systems with a high percentage of analog I/O. It is used in systems with complex network interface requirements or direct user interaction needs.

Technologies In The PAC

Embedded technologies such as Ethernet, OLE for Process Control, and Structured Query Language enable PACs to communicate with, monitor, and control machines across networks.

PLC vs PAC: The Difference

Both PLCs and PACs are essential to automated processes. But while they are very similar, they are equipped with different programming interfaces. And it is this difference that influences the distinct capabilities of each computer.

Main Differences

• A PLC usually has a simple program with limited memory and minimal input/output (I/O) points. But a PAC can monitor and control thousands of I/O points.

Tag-based programming is another feature of the PAC. This allows a single tag-name database to be used for various functions before being tied to a specific I/O.

• A PAC can control more complex automated systems than a PLC, even those using several software applications. This is due to its more flexible programming, larger memory, and better scalability.

• The open architecture and modular design of PACs allow multiple systems, networks, and machines to operate together and communicate with each other. This means that adding and removing components is simpler in a PAC, thanks to its design.

Your Automation Needs Will Dictate Your Choice

Both PLCs and PACs are vital to the manufacturing industry. It is the complexity of your automated projects that will dictate which one you use. Of course, those sectors with more advanced automated needs, especially those on a grand scale, usually need the PAC.

But although they sound very simplistic, PLCs are also very flexible. They can perform numerous tasks, from replacing relays and timing circuits to controlling your automated processes.

Operating the latest PLCs is simple with the use of interactive touch screens. And thanks to their small size and easy installation, they are ideal for almost any industrial environment.

Conclusion

PLCs and PACs are both useful in the manufacturing industry. But although simple automation projects will perform well with a PLC, a PAC is necessary for more intricate and complex projects.

But whatever your automation control panel needs, we have you covered. We at Automation Electric & Controls understand the needs of the manufacturing industry. In an emergency or tight schedule, there is no time to waste. That is why we service every product that we manufacture or sell and we stock all the parts you’ll need to get up and running again.