1) Power for the field devices typically comes from ________. A) The PLC power supply B) Isolated factory floor voltage sources C) The PLC I/O module D) None of the above
1) Power for the field devices typically comes from ________.
A) The PLC power supply B) Isolated factory floor voltage sources
C) The PLC I/O module D) None of the above
1)
2) The output of a TON timer is true when
A) its input (IN) is true and the elapsed time (ET) is less than the preset time (PT)
B) its input (IN) is false and the elapsed time (ET) exceeds the preset time (PT)
C) its input (IN) is false and the elapsed time (ET) is less than the preset time (PT)
D) its input (IN) is true and the elapsed time (ET) exceeds the preset time (PT)
2)
3) Convert 8B3F16 to binary.
A) 1011001111100011 B) 011010
C) 35647 D) 1000101100111111
3)
4) The memory size of a double word (DWord or MD) is ________.
A) Eight bits B) Four bytes C) Sixteen bits D) Eight bytes
4)
5) PLCs are ________ designed for use in the control of a wide variety of manufacturing machines and
systems.
A) personal computers B) electromechanical systems
C) special-purpose industrial computers D) All of the above
5)
6) Convert 11001010001101012 to hexadecimal.
A) 53AC1 B) 121035 C) CA35 D) 530121
6)
7) A TOF timer's output is true only
A) a specified time after its input transitions from false to true
B) when the PLC is not running the program
C) a specified time after its input transitions from true to false
D) after its elapsed time (ET) has exceeded its preset time (PT)
7)
8) In the Siemens PLC environment, which of the indicated data types is used for data 8 bits long?
A) BOOL B) SINT C) DINT D) INT
8)
9) When power is switched from Stop to Run on a Siemens PLC, the CPU initiates a complete restart
by executing
A) OB1 B) OB1000 C) FC1 D) OB100
9)
1
10) Comparison instructions
A) may be used only in OR (parallel) configurations
B) cannot be used with PLC timer instructions
C) may be combined in AND (series) as well as OR (parallel) configurations
D) may be used only in AND (series) configurations
10)
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