Button Evaluation

Answering the following questions, you can test your knowledge on the subject

What programming method or language is commonly used for making program for PLC (e.g. Siemens S7)?
Choose the correct answer

C programming language
HTML descriptive language
Ladder diagram
PLC-s have no programming option

What type of signal is defined for PLC in case of interfacing standard push button?
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Digital input
Digital output
Analog input
Analog output

What are the possible values for one bit?
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0 and 1
-1, 0 and 1
0 - 255
Any positive natural number

What is the purpose of using PLC Timer?
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Count user inputs
Generate delays
Show current date and time
Control and coordinate PLC internal frequence