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:
Hello, it has been quite some time since I last used the converters with code 7-972-OCB20. What operating system is currently running on your PC? Are there any LED indicators on your converter, and how do they function? Within the MPI tab, you have the option to check the nodes of your MPI node. The default CPU is set to 2, but the MPI address can be adjusted as needed based on where the CPU is located.
The S7-300 device I own features two DSub9 connectors, one dedicated to PROFIBUS DP on the right and the other for MPI on the left. Typically, communication with the programming tool occurs through the MPI interface. Although the video and images you shared do not clearly show where the USB-MPI converter is connected due to the closed cover, it appears to be connected on the right side. I recommend verifying that the converter is indeed plugged into the MPI port, not the PROFIBUS port.
JesperMP mentioned that there may not be a program loaded onto the flash card. It turns out, a colleague tried a different flash card from another kit and it worked. It's important to note not to attempt to use the flash card in a PC card reader. Unfortunately, I made the mistake of formatting it. Now, what should I do next?
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