Phoenix IBS 24BK-I/O-T Compact Fieldbus Module – Real-Time I/O for INTERBUS Automation Systems

📄 Description
The Phoenix Contact IBS 24BK-I/O-T is a compact INTERBUS bus coupler with integrated digital I/O, designed to connect field devices directly to an INTERBUS fieldbus network without requiring a separate I/O module. As part of Phoenix Contact’s Inline (IBS) series, this device combines bus communication, power distribution, and local signal processing in a single DIN-rail unit—ideal for decentralized automation in machinery, process control, and legacy system upgrades.
Featuring 8 digital inputs and 8 digital outputs (24 V DC), the IBS 24BK-I/O-T enables direct connection of sensors, switches, valves, and indicator lights while communicating real-time data to the INTERBUS master (e.g., Siemens SIMATIC, Phoenix ILC controllers). Its robust design, visual diagnostics, and plug-and-play installation make it a reliable choice for industrial environments—even as INTERBUS transitions toward modern protocols like PROFINET or EtherNet/IP.
⚠️ Note: INTERBUS is a legacy fieldbus (now largely superseded), but remains active in thousands of installed systems worldwide—especially in automotive, packaging, and printing industries.
🏭 Application Scenario
At a German automotive stamping plant, a legacy press line used hardwired sensor bundles running 50+ meters back to a central cabinet—causing frequent signal faults and troubleshooting delays. Engineers replaced the wiring with Phoenix Contact IBS 24BK-I/O-T modules mounted near each press station. Each unit connected local proximity switches and solenoid valves, then linked via a single INTERBUS trunk cable to the central PLC. Fault diagnosis time dropped from hours to minutes thanks to per-channel LEDs, and panel space was reduced by 60%. Though INTERBUS is “legacy,” the IBS 24BK-I/O-T extended the line’s life by 10+ years—proving that smart I/O can modernize even older architectures.
⚙️ Key Technical Parameters
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💡 Technical Advantages & Innovations
All-in-One Design: Eliminates need for separate bus coupler + I/O block—reducing cost, footprint, and wiring.
Real-Time Performance: INTERBUS offers deterministic cycle times down to 2 ms for up to 512 I/O points.
Hot-Swap Ready: Modules can be replaced during operation (with proper system configuration).
Robust Diagnostics: Clear visual feedback simplifies maintenance in complex machines.
Backward Compatibility: Works with all INTERBUS masters (Phoenix, Siemens, Bosch, etc.).
🌐 Typical Applications
Automotive assembly lines (legacy robot cells)
Packaging machines with distributed sensors/actuators
Printing presses requiring synchronized I/O
Material handling conveyors
Retrofit projects converting hardwired panels to fieldbus
🔁 Migration Tip: While INTERBUS is no longer developed, Phoenix Contact offers gateway solutions (e.g., IL PB BK DN-P) to bridge INTERBUS I/O to PROFINET or EtherNet/IP for future-proofing.
🔗 Related Products & Ecosystem
Phoenix IBS 24BK: Base bus coupler (without I/O)
Phoenix IBS IL 24 DI 16/…: Standalone 16-channel digital input module
Phoenix IBS IL 24 DO 16/…: Standalone 16-channel digital output module
Phoenix ILC 330 ETH: Modern PLC with INTERBUS master capability
Phoenix Contact FL SWITCH: For INTERBUS network monitoring
Phoenix IB IL RS 232/…: Serial interface modules for legacy devices
🔧 Installation & Maintenance
Wiring: Connect INTERBUS trunk to D-SUB IN; daisy-chain OUT to next node.
Power: Supply 24 V DC to both bus power (if required) and I/O power terminals.
Addressing: Automatic via INTERBUS topology—no DIP switches or software addressing needed.
Diagnostics: Use LEDs for quick status checks; detailed error codes available via master PLC.
We supply new, original Phoenix Contact IBS 24BK-I/O-T units with:
Factory-sealed packaging
Full functional test (I/O response, bus communication)
12-month warranty
Compatibility verification with your INTERBUS master
✅ Conclusion
Though INTERBUS is a mature technology, the Phoenix Contact IBS 24BK-I/O-T remains a cost-effective, reliable solution for maintaining and optimizing existing installations. Its integrated I/O, rugged construction, and simple diagnostics ensure continued performance in demanding industrial settings.












