Ramping PLC Output

tvich · Jun 15, 2009

Anyone out there a suggestion for ramping a PLC output for a Logix5000? I could do it with a time entry, and a gain amount, but just figure there'd be something build in for this. Ramp/Soak seems a little excessive for me.

Anyone, Bueller, Anyone, Bueller...

Thanks

phuz · Jun 15, 2009

I have done quite a bit of this, and I create a timer to my liking, say 100ms, and ramp based on that, and it works out quite well.

leitmotif · Jun 15, 2009

Do I understand you want to ramp the output of an analog output based on time?

I am curious what is the application?

Dan Bentler

paulcamborne · Jun 15, 2009

Does the ramping have to be linear.
Over what time do you want to amp up.
Could you increment the output every scan?

TConnolly · Jun 15, 2009

ramp_output:= starting_point + (ending_point - starting_point)*(elapsed_ramp_time / total_ramp_time)

tvich · Jun 15, 2009

Wow..alot of firepower for support here, thanks guys.

This was nothing complicated. I'm simply going to ramp the output for a VFD, supplying water. I believe I'm going to just use a simple timer and small gain. I just thought there might be an instruction for it.
(I was originally going to use a PID and increment the setpoint, but figured for my app, this was more complicated then need be.)

paulB · Jun 15, 2009

There is S-curve (SCURV) instruction in RS5000, which may be configured as ramp instruction. SCURV instruction is not available in ladder logic, only in function block or structure text.

PaulB.

Ramping PLC Output

tvich

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tvich

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