CHAPTER 5 — CONTROL LOGIC Flashcards
No more than ____ load(s) should be placed in any circuit line between the power lines L1 and L2
1
_____ loads must not be connected in series in one line of a line diagram
2
A ____ is the electrical device in a line diagram that uses the electrical power from L1 to L2
Load
Each line in a line diagram should be numbered starting with the ____ line
Top
A ____________ consists of numbers in parentheses to the right of the line diagram
Numerical cross-reference system
To differentiate between NO and NC contacts, ____ contacts are indicated as a number that is underlined
NC
______ the wire reference numbers is a common method too help differentiate wire reference numbers from other numbering systems
Circling
All circuits are composed of ____ basic sections
3
The signal accomplishes no work by itself; it merely _____ or _____ the flow of current in that part of the circuit
Starts, stops
The decision of a circuit ____, _____, ______, _______, and _______ the signals from the control devices to the load
Adds, subtracts, sorts, selects, redirects
In most cases it is the __________ in the circuit that is responsible for initiating the action
Operating coil
_________________ are one of the oldest and most common methods of illustrating and understanding basic logic functions
Line (ladder) diagrams
____ logic is used in industry when two NO push buttons are connected in series to control a solenoid
AND
____ logic is used in industry when an NO pushbutton and an NO temperature switch are connected in parallel
OR
____ logic has an output if the control signal is off
NOT
_____ logic is an extension of NOT logic in which two or more NC contacts are connected in parallel to control a load
NAND
Memory circuits are also known as ___________ circuits
Holding or sealing
Additional stop pushbutton are connected in ______ using NOR logic with the existing stop pushbuttons
Series
Additional start pushbuttons are connected in _____ using OR logic with the existing start pushbuttons
Parallel
An _____ circuit is an electrical circuit that has an incomplete path that prevents current flow
Open
A switch in the _____ position is an open circuit
OFF
A _____ circuit is a circuit in which current takes a shortcut around the normal path of current flow
Short
A ____ short is a short circuit that opens the circuit as soon as the circuit is energized or when the section of the circuit containing the short is energized
Dead
