Eaton Cutler-Hammer ELC Series Basic Training Manual

Also see for ELC-AN04ANNN: Instruction sheet

Exercise 2: More Logic InstructionsThis exercise covers other basic functions like Set/Reset, MCS/MCR and Compare.Use case: An injection mold machine has an automatic refiller for the plastic pellet reservoir. At thebeginning of the shift, the operator approaches the machine and presses the start button. Thefilling mechanism automatically keeps the level in the reservoir between 10 and 100 lbs. If thefiller is already running, the operator has the opportunity to press a button that engages the fillerat a higher speed to fill the reservoir quicker.• We’ve already created the cycle start command (M0); an output that will turn on a lamp that indicates the factthat the machine is running (Y0); and an e-stop reference (M1).• We will be adding 4 rungs in this exercise. To insert rows, right click in the space between the first rung andthe end statement and choose Insert Row.TIP: If you can’t choose Insert Row, you may still be in Ladder Monitoring Mode! You can toggle in and outof this mode by clicking the button in the toolbar.• Just below the first rung and to the right ofthe M1 contact, either type LD<= and clickthe ellipsis button on the Input InstructionPopup window or click the ApplicationInstruction tool on the toolbar and chooseLD<= from the pull down arrow next toApplication Instruction. The window tothe right will appear.TIP: Get to know this window! The better youunderstand this window, the easier it will befor you to program your ELC. When youuse an advanced function block in ELCSoft,this window is a big help in deciphering howthe program works. For each ApplicationInstruction that you choose in this window,there is a specific description of its functionin the “Function” window.• We will be storing the weight of the reservoirin word D0. Since we want the motor onwhen the wieght is at or below 10, we’ll set the OP1 window to D, the corresponding Device Number to 0, andleave the Index window blank. The OP2 window will be K to represent a constant decimal value, the DeviceNumber will be 10 (our minimum) and Index will again be blank.• The output on this rung will be a SET instruction with Y1 as its reference (to turn on the “fill mechanism”).Either type SET Y0 and press enter, or use the Application Instruction window, choose the SET instruction,and enter Y and 1 respectively.• Repeat the last 3 steps just below the rung you’ve been working on to create a rung that resets (RST) Y1when the value of D0 is equal to or greater than 100. These two rungs should look somewhat like this:Pub. No. TR05003001E For more information visit: www.EatonElectrical.com 19

/ 21

Related manuals for Eaton ELC-AN04ANNN