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PLC control system grounding - Solutions - Huaqiang Electronic Network
The grounding system in a PLC control system plays a critical role in ensuring stable and reliable operation. It typically includes several types of grounds such as system ground, shield ground, AC ground, and protective ground. However, improper grounding can lead to significant interference issues. One of the main problems arises from potential differences between various grounding points. These differences can create ground loop currents, which may disrupt the normal functioning of the PLC system.
For example, when it comes to RF cables, they are often customized to meet specific requirements. This customization allows for flexibility in design and application, making them suitable for a wide range of industrial environments. In the case of shielding layers, proper grounding is essential. If both ends of a cable’s shielding layer are grounded, a potential difference between the two points can result in current flowing through the shield. During abnormal conditions like lightning strikes, this current can become even more significant, posing a risk to the system.
Moreover, the shielding layer, grounding wire, and earth can form a closed loop. When exposed to changing magnetic fields, this loop may induce currents in the shielding layer, leading to signal interference. The coupling between the shielding and the core wire can further degrade signal integrity, especially in sensitive applications. If the PLC system shares its grounding with other systems, the resulting ground loops can cause uneven voltage distribution across the ground plane. This can negatively impact both the logic and analog circuits within the PLC.
PLCs have low tolerance for voltage interference on their logic grounds. Even small fluctuations in ground potential can disrupt logic operations, data storage, and program execution, potentially leading to errors, crashes, or incorrect outputs. To prevent these issues, it's crucial to implement a well-designed grounding strategy that minimizes potential differences and avoids the formation of ground loops. Proper grounding not only enhances system performance but also improves safety and reliability in industrial automation environments.