ANB10D-425/CU2N/NDEL YOKOGAWA ESB Bus Node Unit

The ANB10D-425 is a “Node Unit for Dual-Redundant ESB Bus.” As such, it serves as a field I/O interface module for distributed control systems: it interfaces

field I/O (analog or contact/digital) modules with the central controller (FCU) via the ESB Bus — providing both communication and power to

connected I/O modules.With the “/CU2N” suffix, the unit includes the ESB Bus Connector Unit (two ESB bus connectors, typically

part no. S9562FA) to link into the redundant ESB bus network.The “/NDEL” suffix indicates the Node-Expansion

License — required when the Node Unit is used in certain Yokogawa FCU cabinet

configurations (e.g. AFF50, AFV10/30/40).

Frequently Asked Questions

Q: What exactly does “ESB Bus Node Unit” mean for ANB10D?
A: It’s a rack-mountable module that acts as a hub: it supplies power to and communicates with field I/O modules (analog or digital), then

relays their signals via the ESB bus to the central controller (FCU). The “dual-redundant” design ensures that even if one

power supply or communication path fails, the other maintains operation.

Q: What power supply options are supported?
A: The unit supports multiple supply types: 100–120 V AC, 220–240 V AC, or 24 V DC (depending on suffix configuration).

Q: What kind of I/O modules can I connect?
A: Both analog and digital/contact I/O modules are supported. The node unit can accommodate up to 8 I/O

modules under standard configuration (module count and type

will affect capacity and power load).

Q: In what kinds of applications is ANB10D-425/CU2N/NDEL typically used?
A: Industrial process control (chemical, petrochemical, power generation, water treatment, etc.), remote/distributed

I/O systems, automation networks, SCADA/DCS environments — any case

where redundant, reliable I/O and communication are critical.