Yokogawa ANT401-50 S1 Optical ESB Bus Repeater Master Module

Configured for high-speed deterministic bus extension in Centum VP control systems, the Yokogawa ANT401-50 S1 (ANT401 Optical ESB Bus Repeater Master Module) provides direct physical/electrical execution. It converts electrical ESB bus signals into optical signals for long-distance transmission up to 5 km without introducing phase shifts or protocol breakdowns.

Suffix Breakdown & Model Matrix

The ANT401 series utilizes precise suffix codes to designate safety compliance levels, communication range, and specific hardware revisions within the Yokogawa N-IO and FIO system line:

• ANT401: Core base model designator for the Optical ESB Bus Repeater Master Module supporting transmission spans up to 5 km.
• -5: Standard hardware type configured without explicit explosion protection ratings.
• 0: Basic processing layer variant designated exclusively for legacy hardware maintenance loops.

Hardware Specifications

Distributed Process Control & Fieldbus Topologies

• 4-20 mA HART Loop Protocol and Fieldbus Routing Layer The module functions as a transparent layer-1 physical data converter. It encapsulates real-time digital sub-system telemetry, including 4-20 mA HART device parameters and fieldbus packets, into a continuous optical bitstream, preventing jitter from degrading downstream process variable values.
• Channel-to-Channel Isolation and Optical Safety Controls Internal opto-isolators provide electrical isolation between the inner backplane logic and the external fiber transceiver ports. This prevents high-voltage surges generated in remote field junctions from crossing into the central node backplane, thereby protecting adjacent analog input/output cards from destructive ground potential differences.

Frequently Asked Questions

Q: What are the restrictions regarding hot-swapping the ANT401 module within an active node?

A: The module supports live online insertion and removal (hot-swap) when installed in a redundant baseplate configuration. The companion module maintains active fiber links continuously, allowing replacement without interrupting active process control loops or triggering system shutdown commands.

Q: How does the module react if the fiber optic cable experiences physical attenuation beyond the specification limit?

A: When attenuation drops below the receiver optical power threshold, the module trips a hardware diagnostic flag via the backplane. This activates a system alarm in the Yokogawa Centum VP software platform while maintaining the alternative redundant channel to ensure unbroken process control execution.

Field Installation Guidelines

• Baseplate Slot Seating and Retaining Screw Torque Align the module straight with the designated slot guides on the node unit baseplate. Press the module firmly inward until the backplane connectors fully lock into place, then tighten the top and bottom retaining screws to 0.48 N-m of torque to ensure mechanical stability under low-frequency industrial vibration.
• Fiber Optic Routing and Minimum Bend Radius Constraints Clean all fiber optic connector ferrule faces with standard lint-free solvent before insertion into the transceiver ports. Route the duplex fiber cables through dedicated wireways separate from high-power AC lines, ensuring the cable bend radius never drops below the 30 mm minimum threshold to prevent internal micro-fractures and signal degradation.