The trend of the modern high speed PLC system operation speed

High speed computing speed is also an important aim of Japan PLC system. Due to the current PLC CPU module to use 32-bit RISC chips, computing speed is greatly improved. The general basic instruction execution speed achieves dozens of nanoseconds ( ns) , such as mitsubishi electric Q02HCPU its input instruction execution time is 34 ns, Fuji MICREX - SX series SPH300 20 ns, FA - yokogawa electric motor The M3 F3SP59 - series 7 s its input instruction execution time is 17. 5ns。 Only see one instruction execution time and can't complete. Japan's motor industry ( Japan's motor industry association) JEMA has been advocated by PCmix value ( Namely PLC controller said the processing time of performance indicators, using 1 millisecond perform basic instructions and data processing of the average number of) To measure the speed of PLC. So-called 1 millisecond to perform basic instructions and data processing of the average frequency, the instruction by the PLC application use frequency of statistical calculation of the average. Generally is the basic instruction (54%) ( Instructions (17%), in which 13% output instruction, timer output of the logical operation instruction 21% 3%) , the data processing instruction (39%) ( The transfer instruction (25%), four functional operation instruction, comparison order 6%) 7%, other instructions. Still in mitsubishi electric small Q series, for example, one of the Q25HCPU PCmix value is 10. 3, than A2UHCPU - S1 (5 times faster To 2. 0) , 20 times more quickly than the A2SHCPU ( PCmix value is 0. 5) 。 As the PLC function extension, operation instructions, word processing instruction, communication, etc. With more and more, all kinds of use frequency will occur some changes, PCmix value calculation will also change. Here, by the way, the reason for many times for mitsubishi electric, for example, because of its PLC market share account for more than 50% of the Japanese, as Japan's biggest PLC controller suppliers, thus has fairly typical. At the same time, through software technologies to promote the level of the PLC special operating system, realized the high speed response of the event interrupt ( 200 microseconds) Function, high-speed count function, 0. 5 milliseconds ( Mitsubishi electric small Q series PLC controller) And even zero. 2 milliseconds ( Yokogawa electric FA - The M3 series PLC) The constant scanning time function
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