There are a variety of
perspectives on what an Open Programmable Logic
Controller (PLC) or Programmable
Automation Controller (PAC)
truly is. Some consider it a traditional PLC with open architecture software,
standard languages such as IEC61131-3, standard communications protocols, open
APIs and tool sets to use them. Others include Slot PLCs, which are traditional
PLCs in a PC compatible form factor and integrated into the PC environment.
Some include SoftPLCs or other PC-based controls integrated into the PC environment.
PACs must also open up proprietary technologies to users and integrators for
their applications, especially for machine builders and Original
Equipment Manufacturers (OEMs)
where small and smart products are required as those machines and equipment
become smaller and more distributed. The concept of the PAC coupled with the
manufacturing process and automation design capabilities can address the requirements
of a collaborative manufacturing environment.
A PAC must be a controller that meets user’s needs for real-time control
and be flexible and configurable enough so users can customize and optimize
it to meet their particular needs. In a perfect world, a PAC would be an automation
system with all the components for controlling and automating both machines
and plants. All parts of the system would be designed to maximize software and
hardware integration.
There would be one programming and engineering tool as well as one programming
language for the complete system.
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