Ladder Logic

What is the primary application of Ladder Logic?

• Designing architectural blueprints

• Controlling industrial machinery

• Developing mobile applications

• Managing financial transactions

What is a major disadvantage of using relays in automatic systems?

• They are too small and difficult to handle.

• They are purely electronic and lack mechanical parts.

• They fail quickly due to mechanical wear and electrical burning of contacts.

• They consume very little electricity, making them inefficient.

Why is the programming language called "Ladder Logic"?

• It was invented by a person named Ladder.

• Its diagrams resemble the rungs of a ladder.

• It requires physical ladders to install the control systems.

• It is used to control automated ladder systems.

In a ladder logic diagram, what is the state of a Normally Open (NO) contact when its associated relay coil is not powered?

• It is closed and conducting.

• It is open and not conducting.

• It rapidly switches between open and closed.

• Its state is undefined.

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How is continuous operation maintained after the "AutoStart" button is released in a ladder logic auto-start/stop circuit?

• Through a direct connection from the "ReadyToRun" contact.

• By energizing the "AutoRunning" contact, which then provides a parallel path.

• By holding down the "AutoStart" button indefinitely.

• Using a separate timer to keep the circuit active.

What is a common function in control systems that waits a specified period before turning something on or off?

• A latching relay.

• A momentary switch.

• A timing relay.

• A bypass circuit.

In an Allen-Bradley ladder logic program, what unit is used to specify the delay amount for a Timer On Delay (TON) function block?

• Seconds.

• Minutes.

• Milliseconds.

• Hours.

What term describes more complex functions like timers in ladder logic programming?

• Logic gates.

• Function blocks.

• Control coils.

• Boolean operators.