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Pneumaic 1 > PLC2 > Flashcards

PLC2 Flashcards

1
Q

IF THE VACUUM DOES NOT TURN ON AT STEP 2 OF THE SEQUENCE WHAT TWO I/O DEVICES SHOULD YOU CHECK TO DETERMINE IF ONE OF THESE DEVICES HAS FAILED?

A

MR2 OR SOL2A

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2
Q

WHAT IS THE LIKELY PROBLEM IF A PLC INPUT INDICATOR TURNS ON WHEN THE INPUT DEVICE IS ACTIVATED BUT THE ASSOCIATED INPUT INSTRUCTION IN THE PLC PROGRAM DOES NOT CHANGE STATE?

A

INPUT MODULE

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3
Q

WHAT BEST DESCRIBES THE PROCESS OF SYSTEM LEVEL TROUBLESHOOTING?

A

USING A METHODICAL SERIES OF TESTS TO ISOLATE THE PROBLEM TO A SPECIFIC COMPONENT

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4
Q

WHAT STEPS SHOULD BE TAKEN BEFORE TROUBLESHOOTING THE OPERATION OF AN INPUT DEVICE AND ITS INTERACTION WITH THE PLC PROGRAM?

A

DISABLE OUTPUTS IN PLC

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5
Q

WHICH TYPE OF FAILURE IS OFTEN EASIER TO TROUBLESHOOT BECAUSE IT AFFECTS THE ENTIRE PLC SYSTEM?

A

POWER DISTRIBUTION CIRCUIT

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6
Q

WHAT DOCUMENT IS USED BY PLC PROGRAM DEVELOPERS TO DETERMINE THE STATE OF A PLCS INPUTS AND OUTPUTS FOR EACH STEP IN A MACHINE SEQUENCE?

A

TRUTH TABLE

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7
Q

WHICH METHOD OF PLC TROUBLESHOOTING BEST DESCRIBES THE PROCESS OF CHECKING THE STATUS OF SERIES OF INPUT INSTRUCTION ON A RUNG ONE AFTER THE OTHER TO LOCATE THE INPUT THAT IS PREVENTING THE PROGRAM SEQUENCE ROM CONTINUING?

A

OUTPUT BACK

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8
Q

WHAT TRIGGERS THE START OF EACH STEP IN AN EVENT DRIVEN PLC SEQUENCE PROGRAM?

A

AN INPUT TRIGGERED BY THE COMPLETION OF THE PREVIOUS STEP

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9
Q

WHICH OF THE FOLLOWING IS NOT TYPICALLY USED TO TROUBLESHOOT A PLC PROCESSOR?

A

PLC SOFTWARE

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10
Q

WHAT IS MOST LIKELY FAULTED IN A PLC SYSTEM IF A PLC OUTPUT INSTRUCTION IS ON IN THE LOGIC PROGRAM AND CONTROL POWER IS ON BUT THERE IS NO OUTPUT VOLTAGE AT THE OUTPUT TERMINAL?

A

OUTPUT POINT ON THE OUTPUT MODULE BAD

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11
Q

IF A MACHINE HAS STOPPED IN THE MIDDLE OF ITS SEQUENCE UNEXPECTEDLY AND ALL THE INDICATORS ON THE PLC ARE NORMAL WHERE IS THE PROBLEM LIKELY LOCATED?

A

I/O FIELD DEVICES

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12
Q

IF A PLC INPUT INDICATOR ARE CORRECT BUT EXPECTED OUTPUTS ARE NOT PRODUCED WHAT IS THE FIRST STEP TO TROUBLESHOOT THE PROBLEM?

A

VERIFY THAT THE CONTROLLER IS IN RUN MODE

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13
Q

IF A PLCS INPUT INDICATORS ARE CORRECT BUT EXPECTED OUTPUTS ARE NOT PRODUCED WHAT IS THE FIRST STEP TO TROUBLESHOOT THE PROBLEM?

A

VERIFY THAT THE PROCESSORS FORCE INDICATOR IS OFF

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14
Q

WHAT IS THE FIRST CHECK YOU SHOULD MAKE IF A MACHINE SUDDENLY FAILS ALL PLC INDICATORS ARE NOW OFF AND THE OTHER MACHINES IN THE AREA ARE STILL OPERATING?

A

CHECK THE MAIN POWER DISCONNECT

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15
Q

WHEN ARE I/O FORCES FIRST APPLIED IN A PLC?

A

USER MUST CONFIRM THE FORCES BEFORE THEY ARE APPLIED

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16
Q

WHAT IS THE NEXT CHECK YOU SHOULD MAKE TO TROUBLESHOOT THE PROBLEM IF A PLC INPUT INDICATOR DOES NOT TURN ON AND OFF WHEN THE INPUT DEVICE IS OPERATED?

A

MEASURE SIGNAL AT INPUT MODULE TERMINAL WHEN INPUT DEVICE IS OPERATED

17
Q

THE OUTPUT TAG FILE AND ——ARE NOT CHANGED WHEN A FORCE OUTPUT IS APPLIED.

A

PROGRAM

18
Q

THE SYMPTOMS OF AN INTERNALLY SHORTED MODULE MAKE IT APPEAR AS IF THERE IS A ——— PROBLEM.

A

POWER SUPPLY

19
Q

THE PLC SYSTEMS REQUIRES———–POWER TO OPERATE THE PROCESSOR, I/O, AND OTHER CONNECTED MODULES.

A

DC

20
Q

STEP 1 IN TESTING DISCRETE INPUT DEVICE IS TO ——–THE SYSTEM.

A

DISABLE

21
Q

FORCING ON A PLC OUTPUT WHICH IS ASSOCIATED WITH THE PLCS LOGIC PROGRAM COULD AFFECT ALL OF THE FOLLOWING EXCEPT?

A

PROCESSOR STATE

22
Q

WHAT IS THE LIKELY PROBLEM ONLY ONE CYCLE AFTER PB1 IS MOMENTARILY PRESSED TO START THE SEQUENCE?

A

SOL 2A IS FAULTED OPEN

23
Q

AT WHICH TEST POINT WOULD YOU FIRST TAKE VOLTAGE MEASUREMENT IF ONE OR MORE OUTPUT MODULE INDICATOR LIGHTS ARE ON BUT THE ASSOCIATED OUTPUT DEVICES ARE NOT ON?

A

TP5

24
Q

WHICH OF THESE IS NOT REQUIRED BEFORE FORCING ON A PLC OUTPUT TO TEST AN OUTPUT DEVICE?

A

LOGIC PROGRAM

25
Q

WHICH OF THESE INDICATORS TURNS SOLID GREEN WHEN THE PLC PROCESSOR IS SUCCESSFULLY EXECUTING ITA PROGRAM?

A

RUN

26
Q

WHICH COMPONENT IS MOST LIKELY FAULTED IF THE SEQUENCE FAILS TO START AFTER PB1 IS ACTIVATED?

A

SOL 2A

27
Q

WHAT IS MOST LIKELY TO SUPPLY POWER TO THE DC ELECTRONIC SENSORS WIRED TO PLC DISCRETE INPUT?

A

EXTERNAL POWER SUPPLY

28
Q

WHAT DOCUMENT LISTS THE ACTIONS THAT A MACHINE MAKES TO PERFORM ITS FUNCTION?

A

SEQUENCE OF OPERATIONS

29
Q

IN THIS LOGIC PROGRAM CONTROLLING A PLASTIC INJECTION MOLDING MACHINE WHAT INSTRUCTION AND ADDRESS WOULD YOU PLACE INTO PROGRAM TO REPLACE THE SHADED BLOCK MARKED A ON THE LAST RUNG TO MAKE THE PROGRAM PERFORM THE SEQUENCE GIVEN?

A

NORMALLY CLOSED INSTRUCTIONS, ADDRESS: D13

30
Q

WHICH TROUBLESHOOTING METHOD CAN ELIMINATE THE NEED TO TEST A LARGE PORTION OF A SYSTEM WITH ON TEST?

A

HALF SPLIT

31
Q

IF THE CLAMP AND DRILL MACHINE SHOWN HAS STOPPED UNEXPECTEDLY AFTER PERFORMING STEP 1 OF ITS SEQUENCE WHAT ARE THE MOST LIKELY I/O DEVICES FAILURES?

A

LS3, SOL1A

32
Q

WHAT IS THE LIKELY PROBLEM IF THE MEASURED VOLTAGE AT THE PLC OUTPUT TERMINAL CHANGES FROM LOW TO HIGH WHEN THE OUTPUT IS FORCED ON BUT THE OUTPUT DEVICE DOES NOT RESPOND?

A

OUTPUT DEVICE OR WIRING IS BAD

33
Q

IN A PREVIOUSLY WORKING PLC SYSTEM WHICH OF THESE PROBLEMS WILL NOT APPEAR AS A PROCESSOR FAULT PR FAULT MESSAGE?

A

I/O FIELD DEVICE FAILURE

34
Q

WHICH COMPONENT IS MOST LIKELY FAULTED IF THE DRILL CYLINDER EXTENDS AND NOT RETRACT?

A

LS2

35
Q

WHAT IS THE MOST LIKELY PROBLEM IF A PLCS OUTPUT INDICATOR IS ON AND THE OUTPUT DEVICE TO WHICH IT IS WIRED IF OFF?

A

OUTPUT DEVICE IS BAD

36
Q

AT WHICH TEST POINT WOULD YOU FIRST TAKE VOLTAGE MEASUREMENT IF ALL OF THE INDICATOR LIGHTS ON THE INPUT MODULE ARE OFF AND YOU FIND THESE ADDITIONAL CONDITIONS: MAIN POWER SWITCH IS SWITCHED ON, CONTROL POWER PUSH BUTTON HAS BEEN PRESSED, AND PLS POWER SUPPLY INDICATOR IS ON?

A

TP4

Pneumaic 1 (2 decks)

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