PLC Exercises I - Learnchannel-TV.com

NOR

Which logical function is represented in this truth table?

XNOR

NOR

XOR

NAND

AND

Which statement about the function of this PLC program is correct?

PLC – 2 from 3 circuit

The warning light only lights up if 2 temperature sensors give a high-signal.

The warning light only lights up if all 3 temperature sensors give high-signal.

The warning light only lights up if the temperature sensor B2 gives a high-signal.

The warning light only lights up when all three temperature sensors give a high-signal.

The warning light is active if at least two of the three temperature sensors give high-signal.

Which statement about the following logical function is correct?

Interlocking Outputs in PLC

I0 and I1 can never have a 1-signal at the same time.

The valve opens when the pump is in operation.

The valve must be open when a High-signal is applied to I1.

Pump and valve cannot be switched on at the same time.

The pump can be switched on when a High-signal is applied to I0.

The output should only switch to state “1” if only one input has a logical “1” at a time. Which logical function do you have to use here?

NAND

NOR

XNOR

XOR

A fan should run (Q1 = 1) when the main switch is actuated (S = 1), the temperature sensor (bimetal) reports overtemperature (T = 0) and the motor is running (S2 = 1). Which logical function can be applied to this task?

PLC Ladder 2

Program 3

Program 1

Program 2

Program 4

Program 5

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