1. List four criteria by which PLCs are categorized.

2. What is the memory capacity, expressed in bits, for a PLC that uses 16-bit words and has an 8 K word capacity?

3. State one application for each of the following special I/O modules:

1. High-speed counter module

2. Thumbwheel module

3. TTL module

4. Encoder-counter module

5. BASIC or ASCII module

6. Stepper-motor module

g. BCD-output module

4. With reference to the I/O image tables:

1. What information is stored in PLC input and output tables?

2. What is the input status of a closed switch stored as?

3. What is the input status of an open switch stored as?

4. What is the status of an output that is ON stored as?

5. What is the status of an output that is OFF stored as?

5. List five important procedures to follow when handling static-sensitive PLC components.

6. On the characteristics of Memory Organization in a PLC:

1. Compare the memory storage characteristics of volatile and nonvolatile memory elements.

2. What information is normally stored in the ROM memory of a PLC?

3. What information is normally stored in the RAM memory of a PLC?

4. What information is normally stored in an EEPROM memory module?

7. Individual outputs of a typical AC output interface module usually have a maximum current rating of about how many amperes of current?

8. The following binary PLC coded information is to be programmed using the hexadecimal code. Convert each piece of binary information to the appropriate hexadecimal code for entry into the PLC from the keyboard.

1. 0001 1111

2. 0010 0101

3. 0100 1110

4. 0011 1001

9. Perform the indicated operation on the binary numbers:

1. 1100 + 1011

2. 10111 10010

3. 10111 10010

4. 10111 10010

10. Express the following equations as a ladder logic program: Y = [( + )C] + DE

11.Develop a logic gate circuit for the following Boolean expressions using AND, OR, and NOT gates: Y = (ABC + D)(EF) {note: F-complement}