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45. First Specification - Ball Mill Start Signal

Introduction to Allen Bradley PLCs - RSLogix 500 • 2m 10s

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  • 46. Second Specification - Startup Timer

    The second specification indicated:

    “If the Mill has operated less than 20 seconds, the oil pump should go off when the Mill is turned off, and the fan is to run for an additional 5 seconds after the shutdown of the Mill to cool the motor.”

    It looks like we will need to add a timer that starts ...

  • 47. Ball Mill Motor Control

    In the previous section, we configured the timer “T4:1” to time for 20 seconds after the Ball Mill motor starts. If the motor stops for any reason, we will need to determine if the motor has run for the 20-second time period.

    A TON timer is reset when the input logic to the timer is false, so if...

  • 48. Ball Mill Fan Control

    We want to use the timer logic to satisfy the rest of the second program requirement. The oil pump should stop if the Ball Mill motor stops when it has been running less than 20 seconds, but the fan should run an additional 5 seconds.

    We will take advantage of the properties of a Timer Off instr...

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