Allen-Bradley Flex I/O 1794-APBDPV1 PROFIBUS DP-V1 Communication Adapter

Product Description

The 1794-APBDPV1 functions as a high-performance bridge between a PROFIBUS DP network and Allen-Bradley Flex I/O modules. This adapter is specifically engineered to support the DP-V1 protocol, enabling acyclic messaging for enhanced diagnostics and parameterization of field devices. It serves as the primary gateway for a Flex I/O rack, managing data exchange for up to eight individual I/O modules across the internal backplane.

Designed for modularity, the 1794-APBDPV1 (Part Number: 1794-APBDPV1) reduces wiring complexity by allowing remote I/O placement closer to sensors and actuators. The unit features an industry-standard 9-pin D-shell connector for PROFIBUS connectivity and supports auto-baud rate detection up to 12 Mbps, ensuring seamless integration into high-speed automation loops.

Technical Specifications

• Series: Flex I/O 1794

• Protocol Support: PROFIBUS DP-V1 (Cyclic and Acyclic data)

• Maximum I/O Expansion: 8 Modules per adapter

• Input Supply Voltage: 24V DC Nominal (Range 19.2V to 31.2V DC)

• Input Current Draw: 385 mA maximum

• Flexbus Backplane Current: 640 mA maximum

• Inrush Current Profile: 23 A for 2 milliseconds

• Communication Speeds: 9.6 Kbps to 12 Mbps (Automatic detection)

• Interface Port: 9-Pin Sub-D Female Connector

• Power Dissipation: 4.2 W at 19.2V DC

• Thermal Output: 14 BTU/hr at 19.2V DC

• Isolation Voltage: 500V AC (between network and logic/power)

• Physical Weight: 0.14 kg (0.31 lbs)

Integration and Network Maintenance

When implementing the 1794-APBDPV1, ensure that the PROFIBUS segment is properly terminated at both physical ends. This adapter is particularly suited for process industries where asset management (AMS) or remote calibration via DP-V1 acyclic communication is required.

Implementation FAQ

How does the 1794-APBDPV1 differ from the standard 1794-APB?The 1794-APBDPV1 supports the extended DP-V1 functionality, which allows for advanced diagnostics and the ability to change device parameters while the system is running, whereas the standard APB version is limited to DP-V0 cyclic data exchange.

What cabling is required for this adapter?A standard PROFIBUS copper cable (Type A) is required. Use high-quality shielded twisted-pair cables to mitigate electromagnetic interference, especially when operating at the maximum transmission rate of 12 Mbps.