Yokogawa ANB11D-B25/BU2A Optical ESB Bus Node Unit

Hardware Specifications

Process Control Signal Interface and Isolation Characteristics

The Yokogawa ANB11D-B25/BU2A operates as an optical ESB bus node interface for Yokogawa CENTUM VP distributed control systems. Moreover, it transfers field analog I/O and contact I/O signals between installed I/O modules and the Field Control Unit through the ESB communication network.

The unit incorporates an optical repeater function to support ESB bus connection over optical transmission paths. Therefore, the node unit maintains signal communication integrity when the FCU installation requires extended ESB bus routing.

In addition, the module supports Yokogawa process I/O architectures where channel-to-channel isolation and controlled signal transmission are required. The hardware design allows connection of field instruments using standard analog and contact input/output signal modules installed within the node enclosure.

Frequently Asked Questions

Q: Which FCU interface module is required for connecting the ANB11D-B25/BU2A to an FCU?
A: The ANB11D-B25/BU2A requires an ESB Bus Couple Module EC401 or EC402 installed in the FCU for ESB bus connection.

Q: Can the ANB11D-B25/BU2A operate in a single configuration?
A: Yes. For single configuration, the EC401 or EC402 module is installed in slot 7, while slot 8 remains empty.

Q: What power supply options are available for this node unit?
A: The unit supports 100-120 VAC, 220-240 VAC, and 24 VDC power supply configurations according to suffix code selection.

Field Installation Guidelines

Install the ANB11D-B25/BU2A in a standard 19-inch rack according to Yokogawa installation requirements. Verify that the FCU contains the correct ESB Bus Couple Module before connecting the ESB bus interface.

Maintain proper separation between signal wiring, power wiring, and communication cables to reduce electrical interference. Furthermore, connect cable shields according to the system grounding specification to maintain stable analog and contact I/O signal transmission.

Check the selected power supply voltage before energizing the unit. Confirm that optical ESB bus connections are correctly installed and that all connected I/O modules are securely mounted before system commissioning.