Host Engineering Forum

General Category => DirectSOFT => Topic started by: rlawson on May 15, 2007, 06:17:02 AM

Title: Ramp Soak ramp slope counts per second
Post by: rlawson on May 15, 2007, 06:17:02 AM

I have a heat treating process where I want to use the ramp soak generator with a 260 cpu system. The problem that I have is the ramping counts per second function. For example I need to ramp at a rate of 100 deg F per hour. With the ramp slope variable I am limited from 00.00 to 99.99 counts per second. 100 deg per hour equates to .0277. .01 gives me 36 deg F per hour, .02 gives 72 deg/hr, and .03 gives 108. Since I need to maintain 100 degrees instead of 72 or 108, what are my options? Is this beyone the capabitity of the built in ramp soak generator?
Tks, Robert

Title: Re: Ramp Soak ramp slope counts per second
Post by: MikeS on May 23, 2007, 03:34:26 PM

That's all you have to work with in these PLCs.

You'll have to roll your own ramp/soak table in your ladder code to get the steps you need.

Title: Re: Ramp Soak ramp slope counts per second
Post by: rlawson on June 08, 2007, 06:40:05 AM

Thats what I figured, thanks for confirming what I suspected.

Robert

Title: Re: Ramp Soak ramp slope counts per second
Post by: BobO on June 09, 2007, 12:45:03 PM

Sound like a good feature for a future PLC...ramp/soak generator with selectable time base... ;)