Intro to analog IO Fall 09

Intro to analog IO Fall 09 - MFET 474, Manufacturing...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
MFET 474, Manufacturing Integration II 9/1/2009 Introduction to Analog I/O 1 MFET 474 Manufacturing Integration II Introduction to Analog I/O T.E. Kostek Fall 2009 Topics • Part 1 – Discrete vs. Analog •P a r t 2 – Analog Inputs • Part 3 – Analog Outputs 2
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MFET 474, Manufacturing Integration II 9/1/2009 Introduction to Analog I/O 2 Part 1 Discrete vs. Analog •A discrete (digital) input or output is either fully ON or fully OFF – only two states are possible. Discrete vs. Analog Voltage 24 4 Time 0
Background image of page 2
MFET 474, Manufacturing Integration II 9/1/2009 Introduction to Analog I/O 3 • Common discrete inputs : – Pushbuttons and selector • Common discrete outputs : – Pilot lights Discrete vs. Analog switches – Thumbwheel switches – Mechanical limit switches – Photoelectric sensors – Inductive proximity – Numeric displays – Solenoids – Relays – Motor starters 5 sensors – Relay contacts • Discrete Example: – Suppose an inductive proximity switch is wired to a discrete PLC DC input module Discrete vs. Analog • The output of the proximity switch is either on or off • The PLC input is either switched to COM (the negative terminal of the 24 volt DC supply) or 6 negative terminal of the 24 volt DC supply) or switched to +24 VDC
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MFET 474, Manufacturing Integration II 9/1/2009 Introduction to Analog I/O 4 • Discrete Example Continued: Discrete vs. Analog Inductive proximity switches 7 Door Limit Switch More Discrete Input Examples Limit switches for vacuum shroud (vacuum shroud shown in bottom position 8 shown in bottom position) Adjust hard limits here
Background image of page 4
MFET 474, Manufacturing Integration II 9/1/2009 Introduction to Analog I/O 5 Limit switches for vacuum shroud More Discrete Input Examples 9 • Example – Discrete Inputs Wired to a PLC-5 Notes : Field devices -16 point input module is shown here - DC inputs are used in this example - Terminals are 10 numbered using Octal - Requires an external DC power supply Screw terminals
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MFET 474, Manufacturing Integration II 9/1/2009 Introduction to Analog I/O 6 •An analog (continuous) input or output can take on ANY value, usually within a fixed range of values Discrete vs. Analog values. Voltage 10 11 Time 0 • Typical PLC analog inputs: – Pressure transducers Discrete vs. Analog – Flow transducers – Position transducers – Temperature transducers –e tc . 12
Background image of page 6
MFET 474, Manufacturing Integration II 9/1/2009 Introduction to Analog I/O 7 • Typical PLC analog outputs: – Hydraulic servo valves (proportional valves) Discrete vs. Analog • The analog voltage is wired to an amplifier. The amplifier controls the valve. – Variable frequency drives (control the speed of an electric motor) 13 – Analog meters (for display purposes) • Common analog ranges: – 0 to 5 v, 0to10v Discrete vs. Analog – 0 to 10 v, – -10 to +10 v, – 4 to 20 ma 14 PLC-5 analog modules
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
MFET 474, Manufacturing Integration II 9/1/2009 Introduction to Analog I/O 8 • Analog Example: – A pressure transducer (sensor) measures pressures ranging from 0 to 1000 psi The transducer generates Discrete vs. Analog ranging from 0 to 1000 psi.
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/29/2012 for the course MFET 474 taught by Professor Kostek,t during the Fall '08 term at Purdue.

Page1 / 27

Intro to analog IO Fall 09 - MFET 474, Manufacturing...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online