Free running counter

dskplc

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Aug 2013

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New Zealand

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119

• Nov 17, 2016

• #1

Hello,

I am used to RSLogix 5000 for timers and counters. I am wanting to have a free running counter using Unity Pro but see there isn't a .dn bit in Unity Pro's TON block. Does anyone have experience in Unity Pro for creating a free running counter? Thank you.

 

rdrast

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• Nov 17, 2016

• #2

Addition?

Every scan, add 1 to a register. Done.

 

dskplc

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• Nov 17, 2016

• #3

rdrast said:

Addition?

Every scan, add 1 to a register. Done.

Click to expand...

Hello rdrast,

Thank you for your answer but can you please explain a bit more?
Thanks!

 

jaden

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Pleasant Dale, Nebraska

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• Nov 17, 2016

• #4

Can you explain more about what you are trying to accomplish? Are there time intervals needed?

 

rdrast

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• Nov 18, 2016

• #5

What is there to explain?

You dedicate a register... Whatever it is called on your PLC.

Have an unconditional ADD instruction somewhere, that is executed every scan.

So, every scan, REGISTER = REGISTER + 1.

That is a free-running counter.