PLC Test question with answers
Define a PLC - -Industrial grade computer capable of being programmed to perform control functions.
-Advantages of a PLC over relay logic - -Eliminates most hardwiring. Easy to use and fast.
-Programming Device - -Used to enter the desired program into the memory
-CPU - -The Brain; Controls the PLC
-I/O System - -Forms the interface to connect field devices to the controller
-Power Supply - -Supplies DC power to other modules
-Function of an output interface module - -Control external devices
-Standard PLC programming language - -Ladder Logic
-What does the backplane do? - -Allow modules to be plugged in
-Function of an optical isolator - -Separates two circuits using an optical coupler.
-What does the discrete output module recognize? - -Binary on and off signals
-PLC keyswitch positions - -Run, Remote, Program
-Why does the digital system work so well with computer circuits? - -0=no signal 1=signal
-What does LSB mean? - -Least Significant Bit
-What does MSB mean? - -Most Significant Bit
-What is a bit? - -Binary digit, smallest unit in the binary numbering system
-What is a byte? - -A group of adjacent bits
-What is a word? - -Number of bits treated as a unit
-How many bits are there per byte? - -8
-Base of Binary - -2
-Base of Decimal - -10
-Base of Octal - -8
-Base of Hexadecimal - -16
Define a PLC - -Industrial grade computer capable of being programmed to perform control functions.
-Advantages of a PLC over relay logic - -Eliminates most hardwiring. Easy to use and fast.
-Programming Device - -Used to enter the desired program into the memory
-CPU - -The Brain; Controls the PLC
-I/O System - -Forms the interface to connect field devices to the controller
-Power Supply - -Supplies DC power to other modules
-Function of an output interface module - -Control external devices
-Standard PLC programming language - -Ladder Logic
-What does the backplane do? - -Allow modules to be plugged in
-Function of an optical isolator - -Separates two circuits using an optical coupler.
-What does the discrete output module recognize? - -Binary on and off signals
-PLC keyswitch positions - -Run, Remote, Program
-Why does the digital system work so well with computer circuits? - -0=no signal 1=signal
-What does LSB mean? - -Least Significant Bit
-What does MSB mean? - -Most Significant Bit
-What is a bit? - -Binary digit, smallest unit in the binary numbering system
-What is a byte? - -A group of adjacent bits
-What is a word? - -Number of bits treated as a unit
-How many bits are there per byte? - -8
-Base of Binary - -2
-Base of Decimal - -10
-Base of Octal - -8
-Base of Hexadecimal - -16
