Set Alarm

faiek · Nov 21, 2009

I am using AB PLC 1769-L32E, with Analog Input 1769-IF4
I set the Input Ch#1 to 0-5V which represent the motor speed feed back I would like to set Alarm Lamp when the Speed reaches 4.5 out of 5. I will appreciate if somebody give an example on Ladder programming.

Mechtrician · Nov 21, 2009

I would use a > or = 4.5 to either energize or latch your warning pilot light. I can provide an example if you like.

faiek · Nov 21, 2009

Mechtrician said:
I would use a > or = 4.5 to either energize or latch your warning pilot light. I can provide an example if you like.

Thanks, I appreciate if you provide me with example.

Mechtrician · Nov 21, 2009

Here is an example in attachment

faiek · Nov 21, 2009

Mechtrician said:
Here is an example in attachment

That's a great help

Thanks

Mechtrician · Nov 21, 2009

Your welcome, remember, thats not the only way that can be done, consider what you want specifically to do, but thats the basic idea.

Mickey · Nov 21, 2009

You may want to consider scaling your 0-5volt signal to engineering units.
It makes more sense to view actual speed. Then use the scaled engineering unit value for your compare instruction.

faiek · Nov 21, 2009

Mickey said:
You may want to consider scaling your 0-5volt signal to engineering units.
It makes more sense to view actual speed. Then use the scaled engineering unit value for your compare instruction.

you are right, my intention now to learn how to manipolate with analoge I/O.
Best Regards,

Set Alarm

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