Overview
The Allen-Bradley 440S-SLF8D is an 8-pin GuardLink-enabled tap designed for electronic safety input devices supporting Power to Lock (PTL) applications. This component connects safety devices with 8-pin OSSD (Output Signal Switching Device) contacts to a GuardLink safety system, eliminating the need for additional wires between the machine control system and the safety gate interlock.
Key Features
- 8-pin M12 micro connector for OSSD-enabled safety devices
- Simplifies series connection of multiple safety devices in a GuardLink network
- Power to Lock (PTL) support for guard locking interlocks
- Simultaneous or individual lock/unlock capability within the series chain
- Passive design—no additional power conditioning required
- IP67 ingress protection rating for robust industrial environments
- Fast response time: 5 ms safety signal activation
- Achieves high safety integrity ratings through series configuration
Technical Specifications
- Connector Type: 8-pin Micro M12
- Supply Voltage: 24V DC
- Maximum Current: 4A
- Ingress Protection: IP67
- Operating Temperature Range: −20°C to +70°C (−4°F to +158°F)
- Housing Material: Polycarbonate
- Mounting: Panel mount with M5 screws
- Weight: 0.1 lb (0.045 kg)
- Certifications: CE, cULus, RCM
- Function: Passive Power Tap for 8-pin electronic safety input devices, Power to Lock
- Response Time: 5 ms safety signal activation; 35 µs per upstream tap
Typical Applications
- Guard locking interlock systems requiring simultaneous control of multiple gates
- Safety device series networks in manufacturing and machine automation
- Industrial equipment with Power to Lock safety requirements
- Systems requiring diagnostic feedback from individual safety devices without dedicated status wiring
- EtherNet/IP-based safety communications in machine control architectures
Compatibility & Replacements
The 440S-SLF8D is part of the Allen-Bradley GuardLink family and is compatible with other GuardLink-enabled taps and 8-pin electronic safety input devices. For 5-pin electromechanical safety devices, refer to the 440S-MF5D or 440S-SF5D tap. For Power to Release (PTR) applications, the 440S-SF8D (electronic) or 440S-MF8D (electromechanical) variants are available. Note: This part is discontinued by the manufacturer but remains available through authorized industrial surplus distributors as new/refurbished stock. It is a direct replacement for legacy GuardLink installations.
