OK I'm really stuck on this one.. I have a 4-20mA signal from a micrologix 1200 going to a AB 1336 drive. The system is on a Army Truck assembly line that pulls the trucks down the line at a set speed. My input is a HMI were the operator enters how many trucks he wants to produce during his shift. This in turn will set the speed of the drive so that the right amount of trucks go down the line in a given amount of time. Now here is the tricky part. The drive speed (Hz) determins the assembly rate. At the max of 120HZ they will produce 4 trucks per hour. Now I have three shifts of 8 hours, 9 hours, and 10 hours. If the operator enters into the HMI that he wants to produce 28 trucks during his 8 hour shift then I need to program the ladder logic to generate a 13.3 mA signal (Binary 27225) to the drive. This card operates from 0 to 32,760 bit (4 to 20 mA).
So I have four parameters to deal with. I have the drive frequency (Speed) the length of the shift and the numbers of trucks per shift requested. I been trying to program this using scaling blocks (SCP). I really could use a fresh frame on mind on this ..
Thanks Guys and Gals.
Jim
So I have four parameters to deal with. I have the drive frequency (Speed) the length of the shift and the numbers of trucks per shift requested. I been trying to program this using scaling blocks (SCP). I really could use a fresh frame on mind on this ..
Thanks Guys and Gals.
Jim