The **XCSDMP7905** is a coded magnetic safety switch manufactured by Schneider Electric (Telemecanique Sensors). It is designed for monitoring the opening of guards and covers on industrial machinery to ensure safety. --- ## 1. Technical Specifications Below are the primary electrical and physical characteristics: | Feature | Specification | | :--- | :--- | | **Contact Type** | 1 NC + 1 NO (Normal state) | | **Switching Technology** | Coded Magnetic | | **Maximum Voltage** | 24 V DC | | **Rated Operational Current** | 100 mA | | **Sensing Distance** | 8 mm (Sao), 20 mm (Sar) | | **Cable Length** | 5 Meters | | **Enclosure Material** | Rectangular Plastic (Compact) | | **IP Rating** | IP66 / IP67 | --- ## 2. Key Electronic Components & Working Principle ### A. Coded Magnetic Mechanism Unlike a simple reed switch that can be bypassed by any standard magnet, the **XCSDMP7905** uses a "coded" system. The sensor contains multiple magnetic elements arranged in a specific pattern. The matching actuator (magnet) must have the exact corresponding magnetic field configuration to trigger the contacts. ### B. Output Configuration (1 NC + 1 NO) The device features two distinct electrical paths: * **NC (Normally Closed):** Opens when the guard is opened. * **NO (Normally Open):** Closes when the guard is opened. * *Note:* These states are defined with the actuator in the "safe" (closed) position. ### C. Cable and Wiring The unit comes pre-wired with a 5-meter cable. Typical wiring for this series follows this color logic (always verify with the specific wiring diagram on the unit): * **Safety Circuit:** Used to signal the safety relay to stop the machine. * **Signaling Circuit:** Used for PLC feedback or status lamps. --- ## 3. Application and Safety Rating This switch is an "interlock" device. To achieve high safety integrity levels (SIL or PLe), it must be connected to a dedicated **Safety Monitoring Relay** (such as the Preventa XPS range). * **Safety Level:** Can reach Category 4, PL e (ISO 13849-1) when used with a monitoring module. * **Advantages:** No physical contact means no mechanical wear, making it ideal for environments requiring frequent cleaning or those with high dust/vibration. ---