The **XCSMP79L2** is a safety interlock switch manufactured by **Telemecanique Sensors** (formerly part of Schneider Electric). It is specifically designed for monitoring the opening of light industrial guards and covers. --- ## 1. Core Technical Specifications | Feature | Specification | | :--- | :--- | | **Switch Type** | Magnetic Coded Safety Switch | | **Contact Configuration** | 1 NC + 1 NO (Normal Closed + Normal Open) | | **Material** | Plastic (Rectangular) | | **Operating Distance** | Sao = 3 mm (Assure Operating); Sar = 13 mm (Assure Release) | | **Connection Type** | 2-meter pre-wired cable | | **Safety Level** | Can reach SIL 3 / PL e (when used with safety controller) | | **Ingress Protection** | IP67 | --- ## 2. Electrical Operation The XCSMP79L2 functions based on **REED switch technology** combined with a coded magnet. * **Coded Magnetic Sensing:** Unlike standard magnets, this device requires a specific magnetic code (the matching actuator) to operate. This prevents simple bypasses with a standard magnet. * **Switching Logic:** * When the guard is **closed** (actuator present), the NC contact is closed and the NO contact is open. * When the guard is **opened** (actuator removed), the contacts switch states, signaling the safety relay to cut power to the machine. * **Voltage/Current:** It typically operates on **24V DC** and is designed for low-current signal switching (safety logic levels). --- ## 3. Wiring Diagram (Cable Leads) The device uses a 4-wire or 6-wire configuration depending on the specific sub-series, but the standard L2 (2m cable) follows this logic: ```text Wire Color Function Logic State (Guard Closed) ----------- ---------- -------------------------- Brown/White NC Contact Closed (Conducting) Black/Blue NO Contact Open (Non-conducting) ``` --- ## 4. Key Applications * **Packaging Machinery:** Monitoring small plastic covers. * **Food & Beverage:** Due to the IP67 rating, it can withstand wash-down environments. * **Pharmaceutical:** Ideal for clean environments where mechanical contact switches might collect debris. --- ## 5. Safety Integration To comply with international safety standards (ISO 13849-1), the XCSMP79L2 should **not** be wired directly to a motor. It must be connected to a **Safety Monitoring Module** (like the Preventa XPS range). This module monitors the two channels for "Discordance" (checking that both contacts change state at the same time) to detect internal wiring faults or short circuits.