Introductory PLC Programming Contents [hide] 1 Introduction 1.1 What is a PLC (Programmable Logic Controller)? 1.2 The PLCs purpose in life 1.3 History of PLCs 1.4 Recent developments 2 Basic Concepts 2.1 How the PLC operates 2.1.1 Scan cycle 3 Basic instructions 4 Wikibooks Links 5 External links [edit]Introduction [edit]What is a PLC (Programmable Logic Controller)? A Programmable Logic Controller‚ or PLC‚ is more or less a tiny computer with a built-in operating system (OS).
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a coin to determine who will be E and S. S holds the timer with preferred time. At E’s go signal‚ S starts the timer and must talk of free associate while making an estimate of 12 second interval. E records the estimate in Table I. S should not see the face of the timer or the data being recorded. Perform 45 trials. Then E and S change roles. Make 10 trials for the second subject. Part – II Repeat the above procedure but this time with the timer facing the S and no free association is required. Perform
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Controlled: Size of the ramp Same car used Same size weights 1x power pack (set to A/C) Equipment: 1x wooden ramp 1x model car 5x 1kg weights 1x stopwatch 1x role of ticker timer tap 1x ticker timer Method: 1. Gather all equipment listed above 2. Set up ramp‚ car (without any weights) and ticker timer (repeat 2 time) 3. Push car down the ramp and record time 4. Repeat experiment by adding on 1 1kg weight each time 5. Record all results into a table 6. Put all equipment away once
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Household Timing Device ● Monroe’s Timer - 2 options: 1. One 48-hour cycle (back-and-forth motion) 2. Two 24-hour cycles (single operation/timer) ● The complete product would be sold through wholesalers and manufacturers’ representatives. Statement of the Problem What should Monroe Clock Company’s full cost computations be given the new overhead rates for its’ cost centers? Case Facts The Issue of the Overhead Costs Case Facts New Household Timers ● No more machining and little
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the sound stimuli.‚ because sound reaches the brain faster than a visual impulse. Independent Variable: Stimuli (Sight/ Sound) Dependent Variable: Reaction time Controlled Variables: Controlled Variables | How do we control them? | Timer | After each trial‚ we have to press the button restart‚ because we have to start counting from 0( seconds) | Partner’s Hand | The person that I was testing had to hold his hand above the Stop button. So whenever he /she hears the sound of a button
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August 28‚ 2008 Y.H.Dandawate 2 August 28‚ 2008 Y.H.Dandawate 3 Features of 8051 8 bit ALU. 16 bit PC and DPTR. 8 bit stack pointer and 8 bit PSW. 4K internal ROM 128 bytes of Internal RAM. 32 bits arranged as four‚8 bit ports P0-P3. Two 16 bit timer/counters‚ T0 & T1. Full duplex serial Port. August 28‚ 2008 Y.H.Dandawate 4 Features contd… Control Registers TCON‚TMOD‚SCON‚PCON‚IP‚IE etc (SFR’s). Two External and three internal interrupt sources. 0-12 MHz clock. 40 pin DIP package. Works in Power
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Chapter 13 Routing Protocols (RIP‚ OSPF‚ BGP) • • • • INTERIOR AND EXTERIOR ROUTING RIP OSPF BGP 1 ©The McGraw-Hill Companies‚ Inc.‚ 2000 1 © Adapted for use at JMU by Mohamed Aboutabl‚ 2003 Introduction Packets may pass through several networks on their way to destination Each network carries a price tag‚ or a “metric” The metric of a network may be: constant (i.e. each network costs one hop) Service type-dependent (the cost of the network depends on what service the packet needs: e.g. throughput
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We then gently set the shells into the liquid making sure not to drop them in and started the timer for thirty minutes. We put shell E in the vinegar since it was our experimental and shell C into the saltwater since it was our control. We then observed them at the 15 minute mark and the 30 minute mark. We didn’t measure mass in the 15 minute mark
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2. Equipment Used: A. Timer Switch B. Time-of-Flight Accessory C. Control Box D. AC adapter E. Drop Box F. Steel ball G. Solid gold ball H. Big plastic ball 3. Method Used: 1) Place the steel ball on the drop box. 2) Set the timer to “Time: Two Gates” mode. 3) Measure the distance between the bottom of the ball and the plate and record in table 4) Release the ball using the timer switch and record the time it
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the embedded market has become one of the most sought after for not only entrepreneurs but for design engineers also. What is a Microcontroller? A single chip computer or A CPU with all the peripherals like RAM‚ ROM‚ I/O Ports‚ Timers ‚ ADCs etc... on the same chip. For ex: Motorola’s 6811‚ Intel’s 8051‚ Zilog’s Z8 and PIC 16X etc… MICROPROCESSORS & MICROCONTROLLERS: Microprocessor: A CPU built into a single VLSI chip is called a microprocessor. It is a general-purpose
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