JamesBUK

Thanks for your reply Felx and your patience. I feel I might not have explained correctly Ive followed Joe’s example for the binary text to look and work like a toggle button. I works perfectly as a button with your ladder logic. press button turns green and closes output, press button turns red and opens output perfect. your ladder lodic works perfectly for the input, close input and the output closes, open input and the output opens, perfect. The only issue is when using the input as the trigger it doesn’t change the button to green. I tried adding a coil linked to Mb6 in series with the first coil but that causes it to latch. I can get round it by creating a “light” (binary image) on the HMI and linking it to a coil in series, this works with the input and the button correctly. It just feels a bit clunky as a solution to have a button that acts as an indicator and a light that acts as an indicator. I feel like the binary text should link to a second MB that changes it’s display state only, then this could be linked in series with the coil and would work with the input and the button. hope that makes sense and thanks for wading through it!

Thank you that works and is something new I have learn't. But when the Input is high the binary text doesn't go to on/green so there is no visual representation on the HMI that the damper is open . I guess I could also trigger a binary image but that doesn't feel like the best way of doing it.

Thanks for the replies. The use case is control of a dust extractor for a cnc router with 5 pneumatic dampers. At various stages in the run cycle of the router dampers open and close to extract dust from areas of the machine. Currently the extractor is turned on in the morning and runs at 100% all day as the operators forget to shut it off between cycles and breaks. I want the plc to receive inputs from the cnc in the form of NO contacts. Then I want to control an inverter to set the speed of the motor to give the required air speed for the amount of dampers open at the time. For example damper 1 on motor 30% damper 2 on motor 20% damper 1&2 motor 60% The HMI buttons were simply to be able to manually open a damper and run the extract. The HMI lights just for a visual representation and to learn skills for other projects The buttons should not be able to turn the output off if the input is on but should be able to turn the output on and off if the input is off If I was proficient with PLCs I’d install air flow sensors in the ducting and set minimum speeds, but that’s a long way off!

Hello, Sorry for the simple question. I have created a binary light, red or green, on button and off button on the HMI I want to switch an output on or off either via the button on the HMI or a digital input Using a positive transition contact + a set coil I can turn the light green with the button press, I use a set coil in parallel to turn the output on. Its turned off the same way using a negitoive transition contact and a reset coil. This works. I then try to add the input to control the HMI light and the output. Using just the input I simply use a direct contact and 2 direct coils in parallel this works to turn the light and the output on as long as there is an input present. The problem comes when I put all 3 lines together. I know this must be simple but I cant't get close to finding an answer on google or you tube any help gladly received. Thanks https://drive.google.com/file/d/19vRhSEifG9UlzNCmIZGY_EzArniOiUza/view?usp=share_link