LogixPro Batch Simulation Help

Any help, suggestions, comments, or even tips on simplifying the logic (linked to below) will be appreciated.

Click to expand...

Lancie1 said:

(1) This is just a heads-up for your future programs. You used 3 PLC outputs (O:3/2, O:3/5, O:3/7) for relays that could just as easily have been internal PLC relays (B3:0/0, B3:0/1, B3:0/2 for example). It doesn't matter for this student exercise, but when you get into the real world, PLC outputs become precious, like gold or diamonds, and cannot be squandered lightly. Outputs and Inputs cost extra, so in general using external I/O, where internal PLC bits would do the job, is considered to be poor practice.

(2) If you press Stop during the Drain mode when Pump 3 is running, it does not stop. What could you do to fix that little problem?

(3) Your Mixer starts before the tank is full (at the same time that Pump 2 starts). I think the original LogixPro Student Exercise required the mixer to start when the tank is full and at the correct temperature.

(4) For your Rungs 8 and 9, you could easily delete one of the auxiliary relays, either "EMPTY" or "DONE". For example, when the Low Level Switch goes on, you could latch on "DONE", and forget about "EMPTY". Every rung where you use EMPTY, you can instead go to the horse's mouth and use LOW LEVEL SENSOR. I suggest make "DONE" into "CYCLE DONE". Why not let your descriptions actually describe something, instead of creating another question "What is DONE"?

(5) You really do not need to Latch your DONE relay. The fewer bits that are latched, the better and safer your program will be. In fact, ask yourself if DONE is doing anything or adding anything that LOW LEVEL SENSOR does not already do?

Click to expand...