This set of Flexible Manufacturing System Multiple Choice Questions & Answers (MCQs) focuses on “Programming of PLC”.
1. Which of the following process involves entering of control instructions to the PLC device?
a) Scanning
b) Programming
c) Installing
d) Processing
View Answer
Explanation: The process of giving instructions to execute the desired functions of the programmable Logic Device is known as Programming. Switching, counting, logic, sequencing and timing are the basic instructions given in the program.
2. What does IEC stand for?
a) Italian Ergonomics Commission
b) Indian Ergonomics Commission
c) Indian Electrical Commission
d) International Electro technical Commission
View Answer
Explanation: IEC stands for International Electro technical Commission. This Commission publishes the standard for programming the Programmable Logic Controllers. It regularly updates and conduct advancement programs related to PLC’s.
3. Direct Entry of the ladder logic diagram into the PLC memory do not require the use of keyboard and monitor for feeding inputs.
a) True
b) False
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Explanation: In order to feed the inputs to the Programmable Logic Controller memory, keyboards and monitors are necessary for the direct entry of the ladder logic diagrams. These are provided graphics compatible monitors with symbols for interrelating.
4. Which of the following provides the means of inputting high level instructions?
a) Technical Diagram
b) Functional Block Diagram
c) Pareto Chart
d) Fish Bone Diagram
View Answer
Explanation: For inputting high level instructions, Functional block diagram is needed. The instructions are composed in the form of operational blocks. Every block can have one or more inputs and more than one output.
5. Which of the following is also known as Grafcet method?
a) Sequence Function Charts
b) Functional Block Diagram
c) Label Chart
d) Quality Chart
View Answer
Explanation: Grafcet method is the other term used to denote Sequence Control Charts. It provides the sequential functions of an automated system and contains step by step transitions of the system from one state to another.
6. What does IL in PLC programming refer to?
a) Intermediary List
b) Instruction List
c) Intellectual List
d) Interpol List
View Answer
Explanation: In Programmable Logic Controller programming, IL refers to Instruction List. It provides a way of entering the ladder logic diagram into the Programmable Logic Controller memory. Low level computer language is used in this technique.
7. Which of the following programming language is likely to be used in the future for PLC’s?
a) Controller Text
b) Logic Text
c) Sequential Text
d) Structured Text
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Explanation: The Programming language which is likely to be used in the future is Structured Text. It is a high level computer type programming language that has the ability to perform calculations and data processing on values other than binary.
8. OUT is the input component of the ladder logic diagram of PLC.
a) True
b) False
View Answer
Explanation: The output component which is used for the rung of the ladder logic diagram of Programmable Logic Controller is OUT.
9. Which low level PLC language stores the new input and start a new rung of the ladder?
a) NOT
b) STR
c) AND
d) ATR
View Answer
Explanation: The low level Programmable Logic Controller language which stores the new input and start a new rung of the ladder is STR.
10. Which of the following requires one input signal to initiate timing sequences?
a) RMT
b) TMR
c) CTR
d) MTR
View Answer
Explanation: The timing component is TMR. It requires only one input signal in order to initiate the timing sequences. Output will be delayed relative to the input by a duration which was earlier programmed by the programmer in terms of seconds.
11. Which of the following is a counter component instruction for a PLC?
a) RMT
b) TMR
c) CTR
d) MTR
View Answer
Explanation: The counter component instruction for a Programmable Logic Controller is CTR. It requires two inputs. One is for the incoming pulse train being counted by CTR and the other is for the reset signal.
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