The **M2SES-2H3-R/CE** is a safety-rated electromagnetic safety locking switch manufactured by **OMRON** (specifically under the ST-series/D4SL-N type family). It is designed to ensure that safety guards (doors, gates) remain locked while a machine is in a hazardous state. --- ### 1. Technical Specifications The following table summarizes the key electronic and mechanical characteristics: | Feature | Specification | | :--- | :--- | | **Model Type** | Electromagnetic Safety Lock Switch | | **Locking Mechanism** | Solenoid Lock / Mechanical Release | | **Rated Voltage** | 24 VDC | | **Contact Configuration** | 2NC/1NO (Safety) + 1NC/1NO (Lock Monitor) | | **Connection Type** | M12 Connector (typically 8-pin or 10-pin version) | | **Ingress Protection** | IP67 (Dust tight and water immersion resistant) | | **Holding Force** | 1,300N (minimum) | --- ### 2. Key Electronic Components & Logic The device operates using a combination of electromechanical contacts and a solenoid actuator. #### A. Solenoid Control * **Power-to-Lock vs. Power-to-Unlock:** The "R" in the suffix usually denotes the specific wiring logic. Most CE-rated models use a **Solenoid Lock** principle where the guard is locked when the solenoid is energized and released when power is cut (or vice versa depending on the specific sub-variant safety logic). * **Voltage:** Operates on standard industrial 24VDC control circuits. #### B. Contact Monitoring The switch contains multiple sets of contacts to provide redundancy and feedback: 1. **Door Position Contacts:** These detect if the physical guard is open or closed. 2. **Lock Monitor Contacts:** These detect if the locking bolt is physically engaged. This is crucial for "Dual Channel" safety systems to prevent the machine from starting if the door is closed but *not* locked. #### C. Built-in Indicators Most models in this series include an **LED display** on the housing: * **Green/Orange/Red LEDs:** Provide instant diagnostics on the status of the solenoid power, the door position, and whether a safety fault has occurred. --- ### 3. Safety Integration This part is designed to be part of a high-level safety circuit (Category 4, PLe according to ISO 13849-1). * **Positive Opening Mechanism:** The NC (Normally Closed) contacts are designed to be forced open mechanically if the switch is actuated, ensuring the circuit breaks even if contacts attempt to weld. * **Interlocking:** It prevents the machine's control circuit from closing unless the actuator key is fully inserted and the solenoid has locked the head. --- ### 4. Wiring Diagram Concept In a typical application, the wiring follows this logic: ```yaml Pin 1-2: 24VDC Solenoid Power (Control) Pin 3-4: Safety Channel 1 (NC - Door/Lock Monitor) Pin 5-6: Safety Channel 2 (NC - Door/Lock Monitor) Pin 7-8: Feedback/Auxiliary signal (NO - Status to PLC) ```