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PLC > PLC > Flashcards

PLC Flashcards

1
Q

PLC

A

Programmable logic controller

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2
Q

PAC

A

Programmable Automated controller

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3
Q

Analog

A

Range, Constantly On

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4
Q

Discrete

A

2 states, true/false , 1 / 0 , on or off

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5
Q

Which device is not an input device

  • push button
  • limit switch
    -pilot light
  • proximity sensor
A

Pilot light

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6
Q

PLC Characteristics

A

-operated by plant engineers / maintenance personnel

-operated in industrial environments
- varies in temp. Vibration. Humidity.

  • not affected by electrical noise
  • no moving parts
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7
Q

PLC COMPONENTS

A
  • processor unit
    • microprocessor “brain”
  • power supply
    • converts 120-240 v ac to LV dc
    • separate unit
  • inputs /outputs
    • inputs
      • buttons , switches , sensors
    • outputs
      • motor starter coils , solenoid valve , light
  • programming device
    • used to enter program into memory
    • computer most common device
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8
Q

Types of I/O Devices

A

Discrete
- either on / off , open / close
- ex. limit switches , push buttons

Analog
- range of possible values
- ex. temperature , pressure sensors

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9
Q

PLCS ARE USED TO CONTROL

A

Process machinery

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10
Q

PLCS ARE USED TO CONTROL

A

Process machinery

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11
Q

PLCs are programmable for fast and easy changes in

A

Relay ladder logic

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12
Q

PLCs are designed to be used by

A

Electricians / technicians
- easy to program

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13
Q

I / O SECTION - CHANGES WHAT INTO WHAT

A

Changes voltage/current signal into logic level signal
- compatible w/ processor
- common v - 24VDC , 5VDC (TTL) , 120 VAC

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14
Q

I / O SECTION - DISCRETE INPUT MODULES PROVIDE

A

ON / OFF - buttons / switches to processor

   - signal sent to output device based on program logic
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15
Q

WHAT IS A PROCESSOR

A

PLC

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16
Q

INPUT / OUTPUT DEVICES ARE ELECTRICALLY CONNECTED TO THE PROCESSOR

TRUE / FALSE

A

FALSE

17
Q

I / O SECTION - LADDER LOGIC

A
  1. Discrete input signals modules provide ON / OFF signal to processor
  2. From the processor it sends a signal to output device based on program logic
  3. Discrete output modules receive output status from processor and turns on/off output devices such as motor starter coils, pilot lights
18
Q

FIXED I/O

A

Complete unit containing processor , I/O section and power supply

Add expansion units with various I/O configurations
- provide more capability

19
Q

Modular I/O

A
  • More flexible than fixed I/O
  • various types of input/output modules
    - housed in rack or chassis
  • local I/O
    - mounted w/ processor
  • remote I/O
    - processor is mounted remotely from I/O
20
Q

LOCAL I/O

A

I/O modules are mounted with the processor

21
Q

Remote I/O

A

Processors mounted remotely from I/O

PLC (1 decks)

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