Siemens PLC analog anti-jamming wiring experience - Database & Sql Blog Articles

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1. S7-300 series I/O modules, particularly the AI modules like SM331-7KB02 or SM331-7KF02 in ET200M, are well-known for experiencing issues with common mode interference voltage (Ucm). Many engineers have faced problems where the signal becomes unstable due to Ucm, making the module unusable. Especially when using 4-wire instruments or sensors, this issue is more common and can lead to serious operational failures. 2. To address the problem of common mode interference voltage (Ucm), many people opt to add an AI signal isolation module. While this approach works, it increases hardware costs, takes up more space in the control cabinet, requires more time for installation and debugging, and introduces additional points of failure. 3. Some system integrators may even include the cost of an isolation module as part of the project overhead, passing on extra charges to the end user without a clear justification. 4. It's widely known that the Siemens S7-300 series manual for the 4~20mA DC measurement range provides detailed guidance on handling 2-wire and 4-wire instruments, as well as isolated and non-isolated modules. It also covers various signal types such as I/U/RTD/TC and offers recommended wiring solutions to suppress common mode interference voltage (Ucm). 5. In short, according to the Siemens S7-300 series 4~20mA DC measurement range manual, the recommended method to suppress common mode interference voltage (Ucm) is as follows: (1) Connect the M-input of each channel to the module ground. (2) Ground the MANA end as well. (3) Short-circuit the MANA end with the M-input of each channel. (4) Ground the unused COMP+ terminal. 6. I've personally encountered this kind of interference during field work. By following the wiring recommendations from Siemens, I was able to resolve the issue effectively. I've also helped other colleagues solve similar problems by guiding them through the same process. This method has proven to be reliable and efficient in real-world applications.

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