Hello, I recently obtained a SIMATIC S7-300 training kit designed for maintenance purposes. However, upon powering it up, I encountered an issue where the PLC does not transition to the RUN mode, and instead, the STOP mode LED blinks every 1 second. After inspecting the 24V regulator, I found that it is measuring 23.65V. I am unsure if this voltage reading is within the acceptable range.
It appears that there is no program saved on the flash card. Do you possess the necessary software and hardware to upload a program onto the CPU? This PLC is equipped with an MPI port, requiring a Siemens PC Adapter (6GK1571-0BA00-0AA0) to connect online. The recommended programming software includes STEP7 V5 or TIA V1x PRO. It is important to note that attempting to use the flash card in a PC card reader is not advised.
This comprehensive training kit includes a programmer. Currently, I am experiencing difficulties with a Dell PC in the office that contains Step 7 lite software. The system is not booting up, and I suspect it may be due to a problem with the HDD jumper settings.
Hello, do you have any ideas on what might be causing the issue? I am still facing the same problem where the STOP LED blinks rapidly after pressing MRES, then returns to a slow blink. I am unable to connect the PLC online. I have created a demonstration video for reference: 20240324 101536. Can you provide any guidance on troubleshooting this issue?
Make sure to access the Setting PG/PC Interface dialog and check that the S7ONLINE access point is set to PC Adapter (MPI). Additionally, in the extended properties, confirm that the adapter type is set to USB.
I verified that:
Hey there, good catch on checking the voltage on the regulator. It's worth noting that a 24V regulator should ideally deliver pretty close to 24V, but small fluctuations like your 23.65V usually wouldn't be a deal-breaker. The key thing to check first would be your wiring connection and the status of your memory module; these are common sources of issues. Faulty I/O modules might also cause your PLC to remain in STOP mode. I'd advise systematically checking these elements. Don't overlook the possibility of needing a firmware update as well.
Hi, it sounds like you've got quite a puzzle on your hands! You're on the right track checking the voltage. The tolerance for a 24V supply is usually within a +/- 10% range, so your 23.65V should fall within the acceptable range. However, the recurring blinking of the STOP mode LED tends to suggest a more severe error. I suggest you consider verifying the status of the memory module, also ensure that your programming is error-free and that you've adequately dealt with any startup interlocks. I hope this helps. Best of luck!
It sounds like you've done some good initial troubleshooting by checking the voltage. A reading of 23.65V is typically within the acceptable range for the S7-300, but that blinking STOP LED usually indicates an issue with the configuration or perhaps a fault in one of the modules. Have you checked the diagnostics or any fault codes in the PLC? Sometimes reseating the modules or ensuring all connections are secure can help, too. Good luck, and let us know how it goes!
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Answer: The blinking STOP mode LED indicates that the PLC is stuck in the STOP mode and is not transitioning to the RUN mode as expected.
Answer: The acceptable range for the voltage at the 24V regulator may vary depending on the specific requirements of the PLC. It is advisable to consult the official documentation or technical specifications provided by the manufacturer to determine if 23.65V falls within the acceptable range.
Answer: Troubleshooting steps may include checking the power supply, ensuring proper program download, verifying connections, examining the hardware configuration, and reviewing error codes or diagnostic messages.
Answer: Common reasons for this issue may include faulty connections, incorrect program execution, power supply problems, hardware malfunctions, or configuration errors. It is recommended to systematically check each of
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