What is a hard PLC? The characteristics of the hardware of PLC for example

What is a hard PLC controller? Like mitsubishi ( 外汇) PLC controller and omron PLC is more hard, while there are several kinds of Siemens model belongs to the soft PLC. Hard PLC is the core of a processor, as well as a means of the ASIC chip dedicated line with PLC, before the vendor of the processor execution is his command, but since the advent of great and sacred iec61131-3, everyone's keeping up with the standard, iec61131-3 defines five languages - — LD, FBD, SFC, ST, IL IL is the most like assembly, so most of the manufacturers of this bit is a processor to carry out a variety of IL language. We will be treated as this bit here temporarily named IEC processor. Also have the manufacturer use FPGA to realize this processor, due to the processor execution is a special instruction, so that the relative speed of soft PLC is many times faster. But it also has its weaknesses, flexibility is not high, and normally only processing instructions, and the PLC function of modern more and more powerful, for the processing of analog and DCS, so manufacturers generally to plus a general CPU to process the analog and the realization of complex function.
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