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Dabar yra 2025 06 29, 14:05. Visos datos yra GMT + 2 valandos.
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Forumas » Automatika, robotai, RC modeliai » Kuom skiriasi PLC nuo kompiuterio
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Kuom skiriasi PLC nuo kompiuterio |
 Parašytas: 2007 06 17, 12:05 |
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| Kodel kartais valdikliai vadinami kompiuteriais? Gal tie vadinami kompiuteriai kašką turi tokio ko neturi PLC. Kiek suprantu tai vienas ir taspats, kodel jie naudoja tokį pavadinimą? |
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Kuom skiriasi PLC nuo kompiuterio |
| Parašytas: 2007 06 18, 00:10 |
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| nu tai valdiklis ir mikrovaldiklis, realiai turi taip ką ir kompas, procesorių, RAM, atmintį ten FLASH ir HDD bet palygink galimybes. |
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privatas - privatiems klausimams
arch linux  |
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Kuom skiriasi PLC nuo kompiuterio |
| Parašytas: 2007 06 18, 10:39 |
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| JAULER rašo: |
| nu tai valdiklis ir mikrovaldiklis, realiai turi taip ką ir kompas, procesorių, RAM, atmintį ten FLASH ir HDD bet palygink galimybes. |
ne matai yra tokie valdikliai kuriuos vaidna kompiuteriais, bet jie daro praktishkai ta pati ka ir valdiklis...  
The architecture of a PLCs CPU is basically the same as that of a general
purpose computer; however, some important characteristics set them apart.
First, unlike computers, PLCs are specifically designed to survive the harsh
conditions of the industrial environment. A well-designed PLC can be placed
in an area with substantial amounts of electrical noise, electromagnetic
interference, mechanical vibration, and noncondensing humidity.
Courtesy of Omron Electronics, Schaumburg, IL
A second distinction of PLCs is that their hardware and software are designed
for easy use by plant electricians and technicians. The hardware interfaces for
connecting field devices are actually part of the PLC itself and are easily
connected. The modular and self-diagnosing interface circuits are able to
pinpoint malfunctions and, moreover, are easily removed and replaced. Also,
the software programming uses conventional relay ladder symbols, or other
easily learned languages, which are familiar to plant personnel.
Whereas computers are complex computing machines capable of executing
several programs or tasks simultaneously and in any order, the standard PLC
executes a single program in an orderly, sequential fashion from first to last
instruction. Bear in mind, however, that PLCs as a system continue to become
more intelligent. Complex PLC systems now provide multiprocessor and
multitasking capabilities, where one PLC may control several programs in a
single CPU enclosure with several processors |
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