Overview
The Banner SI-LS42DMH is a locking-style safety interlock switch engineered for machine guarding and safety-critical applications. This solenoid-locking unit delivers positive opening safety contacts compliant with IEC 60947-5-1 and meets safety requirements for guard interlocking in industrial automation systems. The 24V AC/DC solenoid voltage makes it compatible with standard industrial control circuits, while the thermoplastic housing rated IP67 provides durability in harsh manufacturing environments.
Key Features
- Solenoid Locking Mechanism: Energized solenoid holds guard closed; spring release unlocks when de-energized for fail-safe operation
- Positive Opening Contacts: Dual safety-rated contact configuration (2 NC + 1 NC/1 NO) ensures reliable fault detection and guard interlock control
- 24V AC/DC Operation: Universal voltage supply compatibility with standard PLC and safety controller inputs
- IP67 Thermoplastic Housing: Sealed enclosure rated for washdown, coolant spray, and contaminated industrial environments
- Manual Release Option: Solenoid unlock models include manual release for emergency access and maintenance procedures
- Flexible Mounting: 170 x 43 x 45 mm compact design fits standard guard frame installations
Technical Specifications
Key operating parameters for the Banner SI-LS42DMH:
- Solenoid Voltage: 24 V AC/DC
- Contact Configuration: 2 NC (normally closed) + 1 NC/1 NO (normally closed/normally open)
- Locking Mechanism: Solenoid locking with spring unlock
- Safety Standard: Positive opening per IEC 60947-5-1; suitable for Category 3 and 4 / PL c and e safety applications
- Housing Material: Thermoplastic
- IP Rating: IP67 (dust and water sealed)
- Dimensions: 170 mm (L) × 43 mm (W) × 45 mm (H)
- Weight: 2.0 lbs (0.91 kg)
- Actuator Type: Spring-operated with manual release
Typical Applications
The Banner SI-LS42DMH is widely deployed in:
- Machine safety guard interlocking systems on presses, punch machines, and molding equipment
- Automated assembly line gate and enclosure control
- Hazardous energy lockout/tagout (LOTO) integration
- Emergency stop circuits and two-hand control modules
- Washdown and food processing equipment guarding
- Pharmaceutical and packaging machinery safety systems
Compatibility & Replacements
Compatible With
- All standard PLCs and safety controllers accepting 24V AC/DC discrete outputs
- Safety relay modules and certified safety-rated controllers (Category 3/4, PL c/e)
- Dual-channel safety interlocking configurations per ISO 13849-1
- Guard locking solenoids and mechanical release actuators
- Industrial control systems using IEC 61131-3 programming
Replaces / Drop-In Replacement For
- Banner SI-LS42DM series (earlier revision)
- SI-LS42 series variants with matching solenoid voltage and contact configuration
- Note: Verify contact configuration (NC/NO) and actuator type (spring vs. solenoid) match your specific guard locking application before replacement.
Works With
- Rockwell Automation CompactLogix and ControlLogix safety input modules
- Siemens S7-1200/1500 with safety TIA Portal programming
- Schneider Electric Modicon M340 and TM221 safety controllers
- Omron NX-series safety modules and G3P safety controllers
- Standard industrial safety relay modules (Pilz, Schmersal, Euchner certified)
- EtherNet/IP and PROFINET safety networks via certified safety gateways
