Siemens PLC repair can not work with notebook online programming solutions

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1. Try to move the CPU to the STOP position. 2. Close all software, especially those that use the communication port. Only keep the 200 PLC programming software. 3. To communicate properly with Siemens' latest S7-200 CN CPU, ensure the following: Use STEP 7-Micro/WIN V4.0 SP3 or later and set the software to Chinese. If not met, an error number 82 may occur during download. If the issue persists despite meeting these conditions, check other potential causes. 4. Use the original USB/PPI cable and update the programming software to the latest version. When setting the PG/PC interface, select USB. For non-original cables, ensure the correct COM port is selected (via Computer - Properties - Hardware - Device Manager - Ports). 5. Why does the COM port have an asterisk in front? This indicates it's being used by another program, preventing Micro/WIN from accessing it. Refer to the main steps for checking programming communication. If communication is possible but not stable, check items 1â€“4. If no communication occurs at all, verify all points below: 1. Confirm that STEP 7-Micro/WIN is fully compatible with your Windows OS. 2. Ensure you are using the original Siemens programming cable and that it meets the hardware requirements of your PC or laptop. 3. Check the COM port on the programming computer. Right-click My Computer, go to Properties, open Device Manager (or Hardware tab for Windows 2000), double-click Ports (COM and LPT), then the specific COM port (e.g., COM1). In Port Settings, set Receive and Send Buffers to minimum and keep FIFO selection enabled. Restart the computer to apply changes. 4. Verify the DIP switch settings on the programming cable match the communication rate in Micro/WIN. Click the Communication button on the left navigation bar, check the communication parameters, and adjust via the PC/PPI cable icon. The default CPU communication address is 2, baud rate 9.6K. For new SMART RS-232/PPI cables with Micro/WIN32 V3.2 SP4 or higher, set DIP switch 5 to 1 and enable "Search All Baud Rates" to detect all devices on the network. Standard cables support up to 19.2K, so if the CPU is set to 187.5K, it wonâ€™t be found. 5. If still not working, check the DC power output voltage of the sensor in the lower right corner of the CPU (measure L+/M). It should be above 22V. 6. Use wipeout.exe to restore the CPU to factory settings. By default, the communication port is set to address 2 and baud rate 9.6K.

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