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Article, understand the difference between the single-chip microcomputer and PLC program design -
, for example, was asked whether need to wait for a signal with jump instruction for rising along the emergence of a microcontroller programming thinking. PLC scanning way at the beginning of each scan cycle to read all of the switch quantity input, according to the state of the two scan period before and after the same input point changes to determine whether there is rising. So there's no need to use back jump jump instruction to wait for the emergence of an input signal. If using this method to query the signal of the change of state, PLC can't do anything else, because it's all the energy used in query! And this kind of query was conducted in a scan cycle, will make scanning cycle is very long, it is easy to cause monitoring timer ( Watchdog) Timeout error. In the user program of PLC, only need to use a testing rising along the instruction can capture the pulse signal along the rise. If required quick response, can use the interrupt way, in the rise of the pulse signal along by system program calls the user to write interrupt program.
Anyone who has seen the latest programmable control systems plc manufacturers in operation cannot help but be impressed with how far the technology has progressed over the past few years.
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