Hello, I currently have a Compactlogix 5380 controller that was previously in operation, then temporarily stored in our office for approximately a year. We are now attempting to reintegrate the controller into the same system, but encountering challenges. Despite providing a 24vdc input on any channel of the digital input card, we are not seeing a green indicator light. Additionally, we are observing 18vdc on all other channels even when no other wires are connected to the input card.
Welcome to the PLCTalk forum community! When using the 5380 series CompactLogix, it is important to ensure that you are utilizing the correct 5069-series "Compact 5000" I/O modules. Do you know the specific part number of the digital input module you are currently using? If you are experiencing issues with the DC Common for the "Sensor / Actuator" I/O power bus, it may not be connected properly. Make sure to thoroughly review Chapter 2 or 3 (for standard and GuardLogix) to verify that the power inputs are connected correctly for both the CPU and the I/O modules. For further reference, you can access the manual here: https://literature.rockwellautomation.com/idc/groups/literature/documents/um/5069-um001_-en-p.pdf.
Ken Roach warmly welcomes you to the PLCTalk forum community! The CompactLogix 5380 series utilizes 5069-series "Compact 5000" I/O modules. Could you provide the specific part number of the digital input module you are currently using? It is possible that the issue may lie in the connectivity of the DC Common for the "Sensor/Actuator" I/O power bus (the bottom connector). It is recommended to thoroughly review Chapter 2 or 3 (for standard and GuardLogix) to ensure proper connection of power inputs for both the CPU and the I/O. For further information, you can refer to this link: [insert link here]. Thank you for your response. We have confirmed the presence of a DC Com on the SA power bus. Today, we will conduct additional troubleshooting to identify and resolve any potential issues.
It seems like your controller might be having trouble recognizing the input voltage. This can occur if there was damage during storage or if internal components have degraded over time. Since you mentioned that you see 18vdc on all channels even when there are no wires connected, it could be a sign of electrical leakage or possible short-circuit. It would be worth double-checking if the wire connections, insulation and resistance values are in order. In some cases, resetting the system to its factory settings might help. If that still doesn't sort the issue, you might need professional help to look into the hardware of the controller itself.
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Answer: Answer: The absence of a green indicator light could indicate a potential issue with the digital input card or its configuration. It might be worth checking the wiring connections and the programming logic to ensure proper functioning.
Answer: Answer: The presence of voltage on channels without any wires connected could suggest a potential short circuit or incorrect wiring. It is advisable to carefully inspect the connections and troubleshoot for any wiring errors or faults in the system.
Answer: Answer: When reintegrating a controller after a period of storage, it is recommended to verify the physical condition of the components, check for any signs of damage, ensure proper environmental conditions, and review the configuration settings to address any potential issues that may have arisen during storage.
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