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WorksheetsPLC Midterm Review
Total questions: 10
Worksheet time: 10mins
Output field devices include all of the following except what?
Lights
Push-buttons
Horns
Valves
Discrete signals are signals that are ...
off/on
continuous
4-20mA
not used in PLCs
Optical isolators in the PLC I/O modules are used to...
read the internal operating temperature of the PLC
step up the voltage
power the CPU modules
isolate field device and processor signal currents
Analog input modules convert an analog signal into a usable digital value for the processor using what?
ASCII code
Analog to digital converter circuit (A/D)
Digital to analog converter circuit (D/A)
Stepper modules
Volatile memory is ...
easily altered and lost if power is removed
sold on Wall Street
unalterable and will retain if power is removed
not used in PLCs
What is the type of memory where the PLC program lives in?
ROM
RAM
GOAT
nonvolatile
Identify which card type, slot number, and terminal point for the following address based address: O:5/12
Input card, slot 5, terminal 12
Input card, slot 12, terminal 5
Output card, slot 5, terminal 12
Output card, slot 12, terminal 5
The backplane in a modular style PLC is:
communication to I/O cards
on a printed circuit board that connects to I/O cards
sometimes used to provide power to I/O cards
all of the above
When creating a PLC Program, where are the input instructions located on the PLC ladder logic rung?
left side of the PLC diagram ladder logic
right side of the PLC diagram ladder logic
at the end of the PLC diagram ladder logic program
Which type of PLC would be able to except additional input cards after it has been installed?
fixed
modular
standalone
portable
