I am currently testing the use of a PLC LOGO for controlling some pre-existing controls within a machine. Programmable outputs on my Drive are being utilized to trigger the contacts on the logo, including functions like zero speed, active alarm, and drive ready. Although I have limited experience with PLC programming, I have successfully created a program that works well in simulation. However, I am encountering an issue where the PLC is not recognizing inputs from the 24V outputs of the drive when actually in use. How can I establish a connection to receive inputs from an external source like the output from the drive? It seems that the circuits may need to be connected in some way for proper functionality.
Are you using the 24 vdc model of the LOGO! system? Additionally, are the drive outputs typically open contacts or transistors? Do you happen to have the LOGO! manual on hand for reference?
After trying a different method that initially failed, I successfully linked the 0v of my drive to the 0v of my PLC power supply. The digital outputs of my drive operate at 24v. Is this the proper connection method to ensure functionality?
Inquiring about the LOGO! 24 vdc model and its drive outputs - are they normally open contacts or transistor-based? Seeking guidance from the LOGO! manual for clarification. Currently utilizing digital input and contact output, but encountering issues with linked 0v. Is this setup safe for both devices?
Connecting the common resources offers a consistent point of reference and is the recommended approach to take. This method of connecting the commons is an effective way to streamline processes and foster collaboration.
Sounds like you're on the right track – kudos for braving the world of PLC programming! From your description, it seems like there might be an issue with the connection between your PLC and your drive. As you suspected, it's crucial to establish a circuit connection for functionality. I recommend verifying your physical wiring first, ensuring that connections from the drive's output directly match inputs into the PLC. If wiring seems fine, double-check the programming in your PLC to ensure your input addresses correlate with the wiring. Finally, make sure that your input points in the PLC are properly configured to handle 24VDC signals. Good luck and remember, every challenge is an opportunity to learn!
Based on your description, it seems like you might be dealing with an issue of electrical isolations. Make sure the source (outputs from your drive) and the destination (inputs to your PLC) share a common ground. If they're not on the same power source, you might run into issues getting the PLC to recognize the inputs. Remember, a 'high' signal doesn't mean much unless it’s 'high' relative to a common reference point, usually ground. If this doesn't solve your issue, let’s dig deeper into your wiring setup and PLC program.
Hey there! You're on the right track with understanding that the circuits need to be connected for functionality. It sounds like the issue might be that the PLC is not correctly linked with the 24V outputs from your Drive. Hence, PLC is failing to recognize those inputs. You may want to double-check your wiring first and ensure that no loose connections are present. If everything seems fine in wiring, there could be an issue with input specifications in your PLC programming or an impedance mismatch. Bottom line, it could be a physical connection or a software issue, and both needs to be thoroughly checked to discern the root of the problem. Keep us updated on your progress!
Hey there, it seems like you're doing a great job with your limited experience in PLC programming! Given the issue you're facing, I'd suggest you first ensure that your wiring is correct – sometimes, the simplest issue can be overlooked. Also, confirm that your 24V output is actually creating an output when you expect it to. A multimeter could be useful for this. On the programming side, make sure you're checking the right memory address on the LOGO for the input. If it's still not working, you may need to add an interposing relay between the drive and the LOGO. This can help if the output isn't a pure DC signal or is coming from a different grounding reference, resulting in voltage potential issues. I hope this helps!
It sounds like you're making solid progress with your PLC LOGO integration! Since the PLC isn’t recognizing the 24V outputs from your drive, you might want to double-check your wiring and ensure that your ground connections are correctly established, as a common ground can often be the missing link. Also, confirm that the outputs from the drive are actually providing a stable 24V signal when active. If there's a specific output that needs to trigger the PLC, you might need to use an opto-isolator or relay to ensure compatibility, depending on the current ratings. Good luck, and keep us updated on your progress!
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Answer: - To connect PLC inputs to a VFD for machine control, you need to establish a proper connection between the output of the drive and the input of the PLC. Make sure the circuits are connected appropriately for the signals to be recognized by the PLC.
Answer: - The issue of the PLC not recognizing inputs from the 24V outputs of the drive could be due to improper wiring or configuration. Double-check the connections and ensure that the signals are correctly transmitted from the drive to the PLC.
Answer: - Start by verifying the wiring connections between the drive and the PLC. Ensure that the signals are being transmitted correctly, and check for any potential issues with configuration settings on both the drive and the PLC.
Answer: - To establish a reliable connection between the PLC and the VFD, follow the manufacturer's guidelines for wiring and configuration. Test the connection thoroughly and troubleshoot any issues that may arise during the testing phase.
Answer: - When connecting PLC inputs to a VFD, ensure that the programming in the PLC is set
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