Hello everyone! I recently upgraded a faulty micrologix 1400 1766-L32BWAA series A with a Series C model, which includes an expansion card 1762-IF4 Analog module. After downloading the same program that was running on the Series C controller, I encountered fault 187h "I/O configuration mismatch." I realized that none of the lights on the Analog module were on, even though signals were being applied to all four inputs. Could this indicate another faulty module, or is there additional configuration required? Given that the previous 1400 controller failed, I am inclined to suspect a faulty module, but I would appreciate a professional opinion on the matter. Thank you for your assistance!
For troubleshooting programming issues, try making a quick change, saving it, then undoing the change and recompiling to see if the download and functionality work. Verify if the signal analog card matches the configuration in the program. These steps can help identify any potential issues. - James
Would you be able to send over your program file (please zip it first)? The error code indicates a configuration mismatch in slot 1. It is important to ensure that your program's I/O configuration has the appropriate module for slot 1. In some cases, a new setup may encounter this error when an analog card is placed in slot 1. If reseating connectors and powering down does not resolve the issue, try downloading the program again. While the true root cause may remain unknown, overcoming this error will allow you to proceed to the next task smoothly.
Hey everyone, it's fascinating how your suggestions actually helped me out. I followed the steps of powering down, resetting the card, and redownloading, but still encountered errors. Then I decided to tweak the 'Processor Type' setting in the 'Controller Properties' of my original file to "Micrologix 1400 series C" before redownloading. This caused the program to glitch, prompting me to Ctrl, Alt, Delete it. I reverted back to my original unchanged file, redownloaded it, and voila, it started working. What a strange turn of events! Many thanks to OkiePC and James Mcquade for their assistance.
Hi there! It sounds like you've done quite the troubleshooting already. Indeed, it sounds like a potential faulty module, but before we jump to conclusions, let's not overlook potential configuration issues. It's worth noting that each time you deal with a different model or series, they might require slightly different configurations. The fault you're getting could be related to the micrologix 1400 Series C being configured to access the 1762-IF4 Analog module differently than Series A had. I'd suggest carefully verifying the configuration and the mapping of the I/O again to ensure there's no mismatch. Only if the issue persists after you've double checked everything should you consider the module could be faulty.
Hey! It does indeed seem like a perplexing issue. However, before assuming the module is faulty, just double-check your I/O configuration in the software. If there's any mismatch between the software configuration and the actual hardware setup, it could potentially trigger a fault like you're experiencing. Additionally, try verifying the compatibility of the controller series with the Analog module. The firmware versions might also impact the performance, so be sure the latest or required firmware is installed. If everything checks out and it still doesn't work, it might indeed be another faulty module.
It sounds like you're on the right track with your troubleshooting. A total lack of lights on the 1762-IF4 analog module, even with applied inputs, could indeed indicate an issue with the module itself. However, since the fault you’re encountering is "I/O configuration mismatch," there might be a need to check and ensure that the I/O configuration in your newly downloaded program matches the physical I/O configuration. It could be as simple as reconfiguring your I/O setup in your PLC software to recognize the new module. But if that doesn't resolve the issue, it might be time to consider replacing the module. Good luck!
It sounds like you’ve done a good amount of troubleshooting already! The "I/O configuration mismatch" can often hint at a configuration issue, especially since you’ve switched to a different series. Make sure the I/O settings in your program match the capabilities of the 1762-IF4 module, and double-check the configuration for the expansion module in the hardware settings of the software. If everything seems correct and the module still isn't lighting up, it could indeed be a faulty module or an issue with how it's seated in the rack. It’s worth trying to reinsert the module or testing it in a different slot if possible. Keep us posted on what you find!
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Answer: Answer: Fault 187h indicates an I/O configuration mismatch on the MicroLogix 1400 controller, typically caused by discrepancies between the programmed I/O configuration and the actual hardware setup.
Answer: Answer: The Analog module may not be functioning properly due to a faulty module or additional configuration requirements after upgrading the MicroLogix 1400 controller.
Answer: Answer: Troubleshooting steps may include checking for correct wiring connections, verifying power supply to the Analog module, and ensuring that the module is properly configured in the program.
Answer: Answer: While a faulty module is a possibility, it is also important to consider if there are any configuration differences or setup requirements for the Analog module on the new controller that need to be addressed. Consulting a professional for an expert opinion is recommended.
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