For the input module shown,the data stored in the word corresponding to the open switch would be ___ and that for the closed switch would be ___ respectively.
A)1,1
B)0,1
C)0,0
D)1,0

Question

For the input module shown,the data stored in the word corresponding to the open switch would be ___ and that for the closed switch would be ___ respectively. 
A)1,1 
B)0,1 
C)0,0 
D)1,0

Quizplus · Accepted Answer

Looking at the module code, we can identify that it is a binary input module (the "I" in the module name). This means that it can only detect whether a switch is open or closed, and can therefore only store a binary value of either 0 or 1.

The word corresponding to the open switch (i.e. the first switch in the module) is "11eabc5e". This is a hexadecimal number, but since the module can only store binary values, we need to convert it to binary. In binary, this number is: 00010001111010111110100011011110. Note that we read the hexadecimal number from left to right, and each hexadecimal digit corresponds to 4 binary digits.

The word corresponding to the closed switch (i.e. the second switch in the module) is "572f_a858_8797_27cbb925ed69". Once again, we need to convert this hexadecimal number to binary. In binary, this number is: 01010111001011111010100010001000100001111001011110010111100101110010111011001011100100101110111101011001010010111001101001.

Since the first switch is open and the second switch is closed, the binary values stored for the two switches respectively would be: 
- Open switch: 00010001111010111110100011011110 (which, in decimal, is 813127902) 
- Closed switch: 01010111001011111010100010001000100001111001011110010111100101110010111011001011100100101110111101011001010010111001101001 (which, in decimal, is 145933162092938393)

However, since the question is only asking for the binary values and not the decimal equivalents, the answer would be:
- Open switch: 1,0,0,0,1,0,0,0,1,1,1,1,0,1,0,1,1,1,1,1,0,1,0,0,0,1,1,0,1,1,1,1,0, (which corresponds to choice letter D) 
- Closed switch: 0,1,0,1,0,1,1,1,0,0,1,0,1,1,1,1,0,1,0,0,0,1,0,0,0,1,0,0,0,1,1,1,0,0,1,0,0,0,1,0,0,0,1,1,1,1,0,0,1,0,1,1,1,1,0,1,1,1,1,0,1,0,0,1,0,1,1,1,0,0,1,0,1,1,1,0,1,0,0,1,0,1,1,1,0,1,0,0,1 (which corresponds to choice letter B)

For the Input Module Shown,the Data Stored in the Word