How to shield the I/O module cable connector?

Effective shielding of I/O module cable connectors is crucial for ensuring the continuity of the entire shielding system. Connectors with metal housings, such as metal D-Sub or M12 metal housings, should be selected. The cable shield must be reliably connected to the connector's metal housing at the connector end via 360-degree crimping or soldering. For PCB-mounted connectors, the metal housing should be securely fixed to the module's metal panel using multiple screws or spring clips, and the panel itself should overlap well with the housing. If the connector has a plastic housing, a model with an inner shield should be selected, or the cable shield should be led to a nearby grounding post via a conductor. At the connector, avoid leaving any insulation layer underneath the shield, which could lead to poor contact. For densely packed connectors, a connector assembly board with an integrated shielding cover can be used. After installation, the resistance from the cable shield to the module housing should be checked to ensure a low-impedance path. In harsh environments, heat-shrinkable shielding sleeves or metal braided mesh sleeves can be added to the outside of the connector, along with grounding. The quality of the connector shielding directly affects the radiated emissions and immunity test results at the port.