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Workshop PG5 Exercise Chapter 7 In the case of a counter, the LoaD instruction depends on the state of the ACCU. As we want this load to be an unconditional one, we have to be sure the ACCU is H. So set the ACCU to H first. XOB 16 ; Code executed at start up ACC H ; Load the counter with LD NumberOfFreeSlots ; the value 8 ( unconditionally ) 8 EXOB ; end of start-up program 5. We then simply decrement the counter 100 each time a car enters the lot and increment the counter as soon as one leaves the lot. Each time we have a rising edge on the input 0 ( Sensor at the parking lot entrance ) we want to decrement the counter “NumberOfFreeSlots”: STH NewCar_Signal DYN DynamiseNewCar DEC NumberOfFreeSlots The DYN instruction memorises the state of the Input 0 in a flag (Dynamise- NewCar)from one program cycle to the next. The ACCU is then set as soon as the DYN instruction sees that the Input 0 has gone from 0 to 1. The DECrement instruction is only executed, if the ACCU is set. Do the same thing for the parking lot Exit. STH Car_leaving_Signal DYN DynamiseCar_leaving INC NumberOfFreeSlots © Saia-Burgess Controls Ltd. Page 7E-10
Workshop PG5 Exercise Chapter 7 6. Turn on the light ( red_light Output 17 ) if the counter comes to zero ( no free parkingslots ). STH NumberOfFreeSlots OUT red_light STH sets the ACCU to high if the counter comes to zero. OUT gives the AC- CUstate to the Output 17. So that’s it. See how your program looks at the end. © Saia-Burgess Controls Ltd. Page 7E-11
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Edition: 26/732E5 USERS GUIDE PCD P
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Workshop PG5 Welcome Introduction.
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Workshop PG5 Welcome System require
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Workshop PG5 Welcome 1. Getting Sta
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1. Getting Started INTRODUCTION: 1
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EXERCISE INTRODUCTION: 1 QUESTIONS
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2. Write your first program INTRODU
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3. PCD Resources INTRODUCTION: 1 3.
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Workshop PG5 Resources 3.1 Hardware
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Workshop PG5 Resources 3. 3 SYMBOL
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EXERCISE INTRODUCTION: 1 GENERAL QU
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4. FUPLA programming INTRODUCTION:
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