PLC TEST #2 REVIEW UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

PLC TEST #2 REVIEW UPDATED ACTUAL QUESTIONS
AND CORRECT ANSWERS

Question:
1. The symbol below is an ___ gate.
Answer:
Nor




Question:
2. The following truth table is for an ____ gate.
Answer:
XOR




Question:
3. State the following timer acronyms: RTO TON TOF
Answer:
RTO- Retentive timer on TON-Timer on delay TOF-Timer off delay

Question:
4. Which programming instruction is used to delay the start of a machine or process for a set period of
time?
Answer:
TON-Timer On Delay

Question:
5. Which programming instruction is used to delay the shutdown of machinery, such as an external cooling
fan when a motor has been stopped?
Answer:
TOF-Timer Off Delay

, Question:
6. What is the biggest difference between JMP and MCR?
Answer:
JMP- is energized and MCR is de-energized when an input is powered

Question:
7. What instruction decreases the accumulative value by one each time its rung goes from false to true?
Answer:
Countdown

Question:
8. Which instruction would tell you if your data is outside of a given range?
Answer:
LIM=Limit

Question:
9. What instruction determines whether one source of date is greater than or equal to another?
Answer:
GEQ-Greater than or equal to

Question:
10. Does the Label and the Jump instructions need to have the same address?
Answer:
Yes

Question:
11. What letter do jump instructions start with?
Answer:
Q

Question:
12. True or False: The retentive timer reset (RES) instruction is always given the same address as the timer
it resets?
Answer:
True

Question:
13. True or False: The limit test instruction is true until it detects that the test value is within certain limits.
Answer:
False

Question:
14. True or False: When source A and source B are tested using the LES instruction, the instruction will be
true if A is equal to b.
Answer:
False *When A is less than B it will be true