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二〇一一年四月二十八日
Programmable Logic Controller PLC
The programmable controller abbreviation is PC, in order to distinguishes with personal computer PC, frequently middle increases L in PC, writes is PLC.
Since 1969 first programmable controller appearing on the market, the programmable controller has become one kind importantly, most popular, application situation most industry controller.
At present, the programmable controller manufacturer is multitudinous, product model specification countless, but mainly divides into Europe, the date, the American three the Chinese market, European programmable controller representative is Simens PLC.
PLC has the versatility strongly, the easy to operate, the adaptation surface broad, the reliability high, antijamming ability strong, the programming simple and so on the in the industrial automation control is specially in the sequential control status, in the foreseeable future, will be is unable to substitute.
PLC constitution:
Structurally divides, PLC divides into the stationary type and the combined type (module type) two PLC including the CPU board, the I/O board, demonstrated the kneading board, the memory block, the power source and so on, these elements combine not a dismantable type PLC including the CPU module, the I/O module, the memory, the power source module, the ledger wall or the rack, these modules may defer to certain rule combinati