Phoenix Contact IL PN BK DI8 DO4 2TX-PAC PROFINET Bus Coupler (2703994)

The Phoenix Contact 2703994, also known as the IL PN BK DI8 DO4 2TX-PAC, is a PROFINET bus coupler with integrated I/O. This device serves as the interface between a PROFINET network and the Phoenix Contact Inline I/O system. The bus coupler with integrated I/Os is intended for use within a PROFINET network and represents the link to the Inline I/O system. With eight digital inputs and four digital outputs onboard, this coupler provides built-in I/O capability while acting as the head station for additional Inline expansion modules.

PROFINET Network Integration

The bus coupler connects to PROFINET networks via two RJ45 Ethernet ports. It is compatible with PROFINET IRT (Isochronous Real-Time) starting from firmware version 4.00 or later, enabling deterministic communication for time-critical applications. The coupler conforms to PROFINET specification V2.3 and has received PROFINET approval (ID Z10506). It appears as a PROFINET IO device to the controller, with integrated I/O represented as standard PROFINET process data. Electrical isolation is provided between the Ethernet interface and internal logic to enhance noise immunity. The supports automatic detection of transmission speeds: 100 Mbps is supported via its integrated switch ports.

Integrated I/O Specifications

The bus coupler includes eight digital inputs and four digital outputs as onboard I/O. All digital I/O channels operate at 24V DC. Inputs use 3-conductor connection technology, while outputs also use 3-conductor connection technology. Outputs are rated at 500 mA per channel, providing sufficient current for driving small solenoids, indicator lamps, and relay coils. The onboard I/O can be used independently or in combination with additional Inline terminals. All wiring is accomplished with the included Inline connectors. The integrated I/O eliminates the need for a separate I/O module for smaller node requirements.

Inline System Expansion

As a bus coupler for the Inline I/O system, the IL PN BK DI8 DO4 2TX-PAC can expand to control up to 61 additional Inline devices. The system supports a maximum of 16 PCP (Peripheral Communication Protocol) devices for parameter data exchange alongside process data communication. The local bus transmission speed is automatically detected at either 500 kbps or 2 Mbps, allowing a mix of standard and high-speed I/O modules. The inline system's modular design supports digital I/O, analog I/O, temperature modules, and serial communication modules.

Physical and Environmental Specifications

The bus coupler has an 80mm width design for DIN rail mounting. Protection degree is IP20, suitable for installation in control cabinets. The package includes all necessary Inline connectors for connecting the supply and I/O. The device includes pull-out labeling fields with insert cards that can be individually labeled for terminal identification, as well as compatibility with ZBFM-6 Zack marker strips.

Power Supply and Status Indication

The bus coupler requires a 24V DC power supply for operation. Status indication is provided via built-in LEDs, showing network link/activity, bus communication status, and I/O point states. The integrated power supply terminals allow easy distribution of both bus power and I/O power throughout the Inline station. The device is designed for continuous industrial operation. Electrical isolation is provided between the Ethernet interface and logic, and between logic and I/O power.

Approvals and Certifications

The 2703994 carries multiple marine and industrial certifications including DNV GL (ID TAA00000BN), UL Listed (FILE E 199827), cUL Listed, RINA (ELE121121XG), and ABS (22-2226444-PDA). The device is also approved for PROFIsafe applications, allowing integration with functional safety systems. The bus coupler is CE marked and meets UL 508 standards as industrial control equipment. UAE-RoHS approval (22-04-13087) additionally qualifies this module for use in applicable global markets.

Applications

The IL PN BK DI8 DO4 2TX-PAC is suitable for factory automation, process control, and building automation systems where PROFINET is the chosen industrial Ethernet protocol. The built-in I/O is ideal for small I/O counts or for applications where a coupler and minimal I/O are required in the same footprint, such as infeed sections at beginning of an Inline station.

Conclusion

The Phoenix Contact 2703994 IL PN BK DI8 DO4 2TX-PAC bus coupler provides a compact and integrated solution for PROFINET networks. With eight digital inputs, four digital outputs, and support for up to 61 expansion modules, it is suitable for applications requiring flexible I/O capabilities within a PROFINET based control architecture.