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Up Next in Introduction to Allen Bradley PLCs - RSLogix 500

  • 33. Testing the Program

    The timer, “T4:0”, runs once and times out. Because the “Done” bit remains true, the “ADD” instruction continues to execute and increment the value of “N7:0”. When it reaches 10, it does reset.

    However, the “ADD” instruction runs every scan instead of just once every 5 seconds.

    This is not wha...

  • 34. Modifying the Logic

    So, what do we need to do to fix the logic?

    We see that the timer ran once and stopped. We wanted it to run to the preset value and then restart.

    To do this, we need to add an “XIO” instruction, so that when the timer preset is reached and the “DONE” bit is set, the timer is reset and starts o...

  • 35. Documenting a Program

    We assume that any program we write will eventually need to be modified or maintained by a different programmer. Knowing this, how do we make it easier for another programmer to understand what we have programmed?

    The answer is documentation.

    RSLogix provides several methods for documenting la...