Hello everyone, I am relatively new to PLC programming and am seeking guidance on controlling a linear actuator with button inputs. Here are the specific conditions I need to implement: 1. The actuator should jog while a button is pressed and held down, and it should come to a stop once the button is released. 2. When the button is pressed once, the actuator must move to a predetermined position and halt there. 3. Another button should be designated for homing the actuator. Currently, I don't have access to a testing station to validate my code. Therefore, I would appreciate any insights on whether these functionalities will operate correctly when the corresponding buttons are pressed. Thank you!
Biffing: Have you set up your axis configuration? Do you have a servo drive, SERCOS, or other components in place to operate your linear actuator?
Absolutely! I have configured an axis within the motion group, and I successfully tested its connectivity during my previous lab session.
All integrated motion commands in A-B Logix, such as MAM, MAJ, and MAH, are designed to be "rising edge triggered." This means there's no need for you to "seal in" the instruction to maintain its activation. For instance, once a MAJ jog operation is initiated, the axis will continue to move until it reaches a soft or hardware limit, or until you send a MAS stop command or any other instruction to disable the axis. I highly recommend utilizing "Motion Direct Commands" as an essential step to verify that your servo is correctly configured and fully operational before you start developing your logic. This approach ensures a smoother integration and prevents potential issues in your automation processes.
Thank you for your response. I have a few additional inquiries. Firstly, does the actuator experience any overtravel faults, both negative and positive? I was unable to locate any sub-tags related to this within the axis tag.
When a tag is configured as a linear axis with restricted travel in the scaling tab, there will be specific parameters that need to be established.
Hey there! It sounds like you're on the right track with your PLC programming for the linear actuator. For the first condition, you'll likely want to use a simple latch mechanism that keeps the actuator moving while the button input is active. For the second condition, a one-shot rung could be helpful to ensure the actuator moves to the set position with a single button press, without abrupt movements if the button is held down. For the homing function, make sure to implement a limit switch or position feedback to ensure accuracy. It's great that you're planning this out, and I'm sure if you test it when you get access to a station, you'll see it work as intended! Good luck!
Hey there! Your project sounds exciting, and you’re on the right track with those conditions. For the jog function, using an ON/OFF toggle for the button input should work well; just make sure you implement a continuous loop that checks the button state. For moving to a predetermined position, you'll want to set the actuator's position in response to a rising edge from the button input—essentially, trigger the move only when the button is pressed down. As for the homing function, it typically involves sending a signal to the actuator to go back to a known reference point, which could be done with a simple command in your program. Just be mindful to handle any potential debounce on the button inputs to avoid unintentional behavior. Good luck, and I hope you get to test it out soon!
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