PC Based Control System vs. PLC


There has been more than ten years of reports boasting on the welfares of PC based control system over PLC, as well as the predictions of the dying programmable logic controllers. This practically makes it clear, that both PC based control system as well as programmable logic controllers has their own place in present-day control system, even in a lot of cases, they will likely to act as a team.

The different of PC based control system to PLC
In lower-end process manufactures as food plants for instance, where the programmable logic controllers is powerfully dug in, there is bit interest in alternating to PC-based control system. The ground for this consideration is actually the programmable logic controller's suitableness. Consecutive logic control catered by programmable logic controllers is better fitted for day-and-night performances usual in those types of industries. In specific, a programmable logic controller or PLC may offer repeatable, as well as reliable control which is conducive to high-speed and repetitive processes. Devoted performance and a high-ranking of security measures are also welfares of programmable logic controllers. The boxing side of food plants brings itself well to consecutive logic control system which brings in programmable logic controllers the better choice for conducting and assorting applications.

History of PC based control system usage
Few years ago, the prevision was that PC based control system was going to take traditional programmable logic controller application programs by storm. The ground they didn't is because the programmable logic controllers have kept going to be a low cost, good control alternative. For example, a programmable logic controller with high-speed loop controls, counter inputs, analog points, as well as basic math calculations are useable just around two hundred up to four hundred dollars range on 100 or more I/O and also has choices for expansion. But with PC based control system, even when purchasing a cheap PC, still needs setting it up, loading software, and making certain it's full-bodied enough not to break apart.

Even so, PC based control system has its virtues. It has bigger number-crunching capability, further communication choices, and is pitched more toward information trending and logging, report generation, documentation, and plant monitoring. The main reasons to switch over to PC-based control because it's include networking the control system into a higher-level applications such as handling complex mathematical applications, ERP, and connecting motion weigh scales, bar-code scanners, as well as other devices. In brief, most users think that when information data should be shifted from the controller to a database for analysis, the shift goes a lot smoothly once the information is already in a PC based control system.

http://program-plc.blogspot.tw/2011/07/module-specifications-of-rll-plc.html

http://program-plc.blogspot.tw/2011/07/template-library-of-rll-plc.html
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