PLC-1

Why the optocouplers isolation is used in AI cards of PLC?

• To isolate the AI from being damaged by the power supply

• To isolate the CPU from being damaged by the field instrumentation

• To isolate the CPU from being damaged by the Controlled device

• All of the above

Why the relays is used in AO cards of PLC?

• To isolate the AI from being damaged by the power supply

• To isolate the CPU from being damaged by the field instrumentation

• To isolate the CPU from being damaged by the Controlled device

• All of the above

Gray code is used to:

• Convert Rotational Movement to digital value

• Convert linear Movement to digital value

• Convert motion position to digital value

• All of the above

When the number in Gray code increases or decreases:

• One bit flips at time

• Two bits flip at time

• Three bits flip at time

• All of the above

The PLC Power supply card feeds

• CPU and I/O cards

• Filed devices

• CPU , I/O cards and COM cards

• All of the above

The CPU of PLC contains:

• Microprocessor

• Memory

• None of the above

• All of the above

A scan time is used for:

• Reading inputs and updating outputs

• Reading inputs, Make diagnostic and updating outputs

• Reading inputs, executes program, make diagnostic and updating output

• None of the above

The PLC Analog input module contains:

• DAC

• ADC

• Filter

• None of the above

If we have a fan with variable speed, where should you connect it?

• To analog input

• To analog output

• To digital input

• To digital output

• DI sinking card

• DI sourcing card

• AI sinking card

• AI sourcing card