The **XCSDMC79110** is a coded magnetic safety switch manufactured by Schneider Electric (under the Telemecanique Sensors brand). It is designed for monitoring the opening of guards and doors in industrial machinery to ensure safety. --- ## 1. Technical Specifications Below are the primary electronic and physical characteristics: | Feature | Specification | | :--- | :--- | | **Contact Type** | 2 NC (Normally Closed) + 1 NO (Normally Open) | | **Operating Distance** | Sao = 5 mm (Assured Operating); Sar = 15 mm (Assured Release) | | **Supply Voltage** | 24V DC | | **Switching Current** | 100 mA (Maximum) | | **Connection Type** | Pre-wired cable (Length: 10 meters) | | **Protection Rating** | IP66 / IP67 | | **Safety Category** | Can reach Category 4 (with appropriate monitoring system) | --- ## 2. Key Electronic Components & Working Principle ### A. Coded Magnetic Actuation Unlike a standard reed switch that can be bypassed by any simple magnet, the XCSDMC79110 uses **coded magnetic technology**. * **The Sensor:** Contains multiple magnetic sensitive elements. * **The Actuator:** Contains a specific arrangement of magnets. * **Function:** The sensor only triggers when it recognizes the specific magnetic field pattern of its matched actuator, preventing easy tampering. ### B. Contact Configuration (Staggered) The device features a "staggered" contact arrangement: * **2 NC Contacts:** These are used for the safety loop. When the door is closed, these contacts are closed. * **1 NO Contact:** This is typically used for signaling/status (e.g., sending a signal to a PLC to indicate the door is open). ### C. Wiring Color Codes (Standard) The 10-meter cable contains multiple wires. While you should always refer to the specific wiring diagram on the box, the typical Schneider configuration for this series is: * **Safety Circuit 1:** White / Brown * **Safety Circuit 2:** Green / Yellow * **Signaling Circuit:** Grey / Pink (or similar depending on the specific revision) --- ## 3. Application & Safety Integration To maintain a high Safety Integrity Level (SIL) or Performance Level (PL), this switch should not be wired directly to a motor. Instead, it must be connected to a **Safety Relay** (like the Preventa XPS range). 1. **Redundancy:** The dual NC contacts allow the safety relay to detect short circuits or cross-faults. 2. **Durability:** Because there are no mechanical parts to wear out (non-contact), it is ideal for environments with heavy vibration or wash-down requirements (Food & Beverage). ---