18) A baking process includes three ovens (No. 1, No. 2, and No. 3), each contro
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Question
18) A baking process includes three ovens (No. 1, No. 2, and No. 3), each controlled by a separate PLC timer. The baked product is to remain in each oven for a specified time according to the recipe produced, and then move via conveyor into the next oven. There are three separate recipes to run through the ovens. The following gives the bake time, in seconds, for eaclh recipe: OVEN BAKE TIMES No. 3 No. 1 10 s Recipe 20 s 12 s 16 s 48 s 24 s Construct a program that will allow an operator to select and run any one of the three recipes. Enter the program into the PLC, and prove its operation.Explanation / Answer
ANSWER:
For a simple programming the relay model of the PLC is sufficient. A PLC is also a computer coontrolling a process. When the PLC is normally turned on the normal outputs ill be turned off. This does not affects the valuesof the input. The process of the PLC repeats nearly 10 to 100 times per second.
On Delay Timer(TON):
It is used when an acton is to begin a specified time after the input becomes true.
The instruction mainly includes three status bits namely EN, TT, DN. Their significance is as follows:
Enable Bit(EN);
The enable bit indicates the TON instruction is enabled.
Timer-Timing Bit(TT):
The timing bit indicates that a timing operation is in process.
Done Bit(DN):
The done bit changes state whenever the accumulated value reaches the preset value.
Accumulator Bit(ACC):
The a): ccumulated value specifies the number of milliseconds that have elapsed since the TON instruction was enabled.
Preset Bit(PRE):
The preset bit value specifies the value which is accumulated value must reach before the instruction sets the DN bit.
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