birone_ben_yakov

Here are some attachments for clarity

linxchas- thanks for your reply... You wrote: ******* ******* Again, this is a simple operation- operator enters the footage, presses start, machine stops when footage is reached, operator cuts then reloads with another order, different thicknesses, widths, lengths, etc. We opted for the HMI to replace existing Durant and Red Lion units. The Durant unit uses a wheel encoder which is driven by the sheet metal. Of course there is slippage and it is not completely accurate. The Red Lion unit is a Feet Per Minute display and gets its' signal from a magnetic pickup which senses a gear (sprocket) made for the purpose and there is no slip because it is directly driven from the main gear box for the machine which is driven by a D.C. drive. We are going to use the Red Lion LMPC000 magnetic pickup to feed a signal to the Unitronics V350-35-TR20 and display FPM as well as use a counter to calculate the accumulate feet for the purpose of opening an output which is in series with the existing machine stop. The machine is started with the existing real world start button. Only one output on the V350 will be used- for the stop circuit- NOT the E-Stop, but the machine stop. The HMI is to provide a FPM display, a preset entry pop up keypad, accumulated display and a cycle complete annunciation. Real simple in theory. I have to take the FPM and convert the rate to actual feet per pulse in order to reach the setpoint entered by the operator, then stop the machine. What I have so far is: 40 FPM=77 Hz 40 FPM=(77Hz x 60 sec)=4620 ppm 40/4620=.0086580 4620/40=115.5=1 foot Convoluted perhaps... I'm going to have to do some reading to figure out which blocks to use and how... This is my first Unitronics project. Kind Regards, B'rone

Joe- sorry for the delay in responding. I got slammed... You wrote: *******

Greetings- I was wondering if anyone has used a V-350 or other OPLC for a simple cut to length. Looking for programming ideas. The system works like this: Operator sets the length of material he wants on the HMI Presses start Line runs until the preset Line stops. Operator cuts material by hand. Particulars: Existing Red Lion Mag pickup LMPC0000 which is sensed by a special geared sprocket. This displays on a Red Lion display unit to give the operator a Feet Per Minute rate display. The readings on a FLUKE SCOPE METER are approximately 77 Hz. at a rate of 40 FPM. My thoughts were to bring the mag pickup input into the high speed counter input I-0 and then scale the Hz to equal one linear foot. Take that value to a constant for a counter, then have a data entry register on the HMI for the purpose of the operator entering the desired feet he wants. This value would then be the preset for a counter for the stop command. The counter would have to be reset for the next cycle. We will have an output which energizes an IPR (InterPosing Relay) set up for normally closed contacts which will be in series with the existing line stop (not the e-stop). I'm not sure just yet how to approach the ladder logic and math with the Unitronics. This is my first Unitronics OPLC. This is a proto-type for several more. The machine is a stainless steel slitter- that is, they take one roll of 2 to 3 feet wide material and slit 1/2" to 4" strips which are wound up after the slitting. It is a continuous run until the desired footage is reached for the order. The purpose of the V-350 is so the operator can do other things while the machine runs, without the worry of slitting too much material. The plant wants to err on the plus side, that is give the customer more material as opposed to shorting an order. Any ideas on how you might approach this would be appreciated. Kind Regards, B'rone