PLC breakdown analysis and trouble removal method

  • Time:
  • Click:176
  • source:COCKRIEL CNC Machining
Breakdown of PLC control system is to show its lost formulary function, show whole production controls the total of systematic invalidation commonly, it can be divided again control equipment malfunction for PLC breakdown and spot production two parts. PLC system includes module of box of central processor, lead plane, patulous box, I/O and relevant network and peripheral equipment. Equipment of spot birth control includes port and spot control to detect equipment, wait like relay, contactor, valve, electromotor. The breakdown of most concerned PLC is breakdown of periphery interface signal, when be being maintained so, it is normal to want PLC to have some of partial pilot action only, should not suspect PLC the program. If affirm through diagnosing operation program has output, and the physical interface of PLC does not have output, it is breakdown of hardware interface circuit. Additional hardware breakdown over software breakdown, it is mostly be not satisfied by exterior signal or carry out component breakdown to cause, is not the problem of PLC system. PLC breakdown analysis and eliminate a method: Solve in time of breakdown to facilitate, want breakdown is global sex or local sex to distinguish above all, as above machine show job of component of much place control is abnormal, clew is very much call the police information, this checks the common share such as CPU module, memory module, communication module and power source with respect to need. If be local sex,breakdown can undertake an analysis from the following respects. 1.

According to going up of a machine call the police information searchs breakdown. PLC control system is had diagnose a function richly oneself, give out instantly when the system malfunctions call the police information, prove a cause well and truly and determine breakdown position, have the effect of get twice the result with half the effort, it is the basic measure that maintenance technician removes trouble and method. 2.

Diagnose breakdown according to behavioral order. To automata, its movement is finished according to certain order, through watching athletic process of the system, compare the situation when it is normal that breakdown is mixed, can discover doubtful point, diagnose a breakdown cause. If some water pump needs around valve to want to open ability open, if pipeline is illogical,water pump cannot be started. 3.

According to PLC the input outputs buccal position to diagnose breakdown. In PLC control system, inputting those who output signal to deliver come true through the I/O module of PLC, because this a few breakdown can be on the 1/0 interface passageway of PLC,report comes out, this characteristic is diagnosed for breakdown offerred convenient. If not be the hardware breakdown of PLC system itself, but need not examine program and concerned circuit figure, through inquiring the I/O interface condition of PLC, can find out breakdown reason. Because this wants the I/O of the PLC of familiar control object,normally condition is mixed state of fault. 4.

Diagnose breakdown through PLC program. The majority breakdown that PLC control system appears comes out through PLC program examination. Some breakdown can be shown directly on screen call the police reason; although some have on screen call the police information, but give the reason; that call the police to return some breakdown not to arise without direct report call the police information, just some of movement is not carried out. Two kinds of circumstances after encountering, dog of PLC program the effective method that moving is diagnose breakdown. The state that can carry PLC according to the program to simple breakdown shows information, person, output and mark lose related surveillance condition, of trace program move, and complex breakdown must use process designing implement come of trace program move. If some water pump does not work, the PLC output port with examination corresponding discovery is 0, discover through examining a program hot water pump still is controlled lukewarmly by water then, lukewarm insufficient PLC did not output water, the trouble removal after water temperature rise is fast. Of course, afore-mentioned methods were to give out only the point cutting a person that breakdown settles, the reason that produces breakdown is very much, so pure support some kind of method is to cannot realize breakdown to detect, need a variety of method couple, cooperate the partial integration analysis such as circuit, machinery. CNC Milling CNC Machining