Of PLC detect automatically function and breakdown are diagnosed

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  • source:DALLMAN CNC Machining
PLC is had diagnose a function very perfectly oneself, be like occurrence breakdown, have the aid of diagnoses the finds occurrence fault part with OK and convenient program oneself, the job can return to normal after changing. The method that breakdown handles can consult the breakdown of S7-200 system manual handles a guideline. Carry out a proof, the PLC of fault rate outclass of peripheral equipment, and when these equipment malfunction, PLC won't stop automatically machine, can make breakdown limits expands. To discover fault in time, program of usable echelon plan is diagnosed what realize breakdown oneself and handle oneself. 1.

Detect overtime the time that mechanical equipment needs in the place of each labor situation is basic and changeless, because this can use time be reference, in can make up Cheng controller to issue signal, when a timer starting to begin devise a stratagem when corresponding exterior actuator begins an action, the duration that the set value of timer falls this action than normal circumstance is long 20% the left and right sides. If some actuator is in below normal circumstance after moving 10s, make spacing switch movement, issue the signal that the movement ends. The timer that starts set value to be 12s when this actuator begins an action is time, if the signal that did not get behavioral end is returned after 12s, by timer often open contact to issue fault signal, this signal suspends regular program, start call the police to show a program with breakdown, make operate personnel and maintenance technician the sort of breakdown of can rapid differentiate, take the step that eliminates breakdown in time. 2.

When the mistake checks logic to move normally in the system, signal of the input of PLC, output and in-house signal (the condition that is like memory) mutual between the relation that existing to decide, if appear unusual logistic signal, explain gave trouble. Because this can weave the unusual logic of a few common breakdown concerns, once unusually logistic relation is ON condition, should press breakdown processing. If there is action of two spacings switch early or late in mechanical movement process, these two signal won't put through at the same time. If they put through at the same time, the specification has switch of a spacing to be blocked dead at least, should stop machine undertake handling. Pursue medium in echelon, of the memory that uses correspondence of switch of these two spacing often open contact series, come to what drive expresses the memory of spacing switch breakdown can undertake detecting. CNC Milling CNC Machining