Yokogawa ANB10D-125/CU2T CENTUM VP Node Units

Configured for deterministic data exchange in CENTUM VP systems, the Yokogawa ANB10D-125/CU2T (ANB10D ESB Bus Node Unit) provides direct physical backplane execution for eight Field Input/Output modules. It terminates dual-redundant ESB bus loops via integrated CU2T connector units, delivering regulated 24 VDC power to field transmitters and executing real-time signal conversion between the Field Control Unit and peripheral hardware.

Suffix Breakdown & Model Matrix

• ANB10D: Node Unit for Dual-Redundant ESB Bus (FIO compatible).
• -1: 100 to 120 V AC Power Supply configuration.
• 2: Dual-Redundant Power Supply Configuration.
• 5: Basic Type with no explosion protection.
• /CU2T: Connector Unit with Terminator (S9564FA x 2).

Hardware Specifications

4-20 mA HART Loop Protocol Compatibility

• Loop Integrity: The node unit's backplane supplies stable current sourcing to ensure loop integrity during digital communication handshakes.
• Ground Loop Prevention: Channel-to-channel isolation within the populated FIO cards prevents ground loop formation when interfacing with HART multiplexers.
• Deterministic Polling: The ESB bus maintains deterministic polling cycles required for HART variable readback without compromising the primary control scan time.

Frequently Asked Questions (FAQ)

• Q: What is the hot-swap limitation for replacing a single power supply module in the -125 configuration?

  A: The ANB10D-125 features dual-redundant power modules. One PW481 module can be removed and replaced while the second module maintains full operational voltage to the backplane and FIO cards. Ensure the replacement module matches the 100-120 V AC rating before insertion.

• Q: Does the /CU2T option require external termination resistors?

  A: No. The /CU2T designation includes two pre-installed connector units (S9564FA) that contain internal bus terminators. Do not install additional resistors on the ESB bus trunk when using this configuration.

• Q: What is the maximum backplane current load supported per I/O slot?

  A: Each FIO slot receives regulated 24 VDC from the node unit. The total current consumption must not exceed the power supply capacity of 120 W. Refer to individual FIO module datasheets for specific draw calculations to prevent overload.

Field Installation Guidelines

• Secure the 19-inch rack-mounting chassis directly to standard EIA rails and connect the frame to the central plant earth ground.
• Maintain clear clearance above and below the housing to facilitate natural convection cooling under maximum 120 W thermal load.
• Verify incoming supply lines operate within the 90 to 132 V AC range before energizing the dual power modules.
• Torque all terminal block screws to manufacturer recommendations and anchor ESB cables tightly to prevent strain on the /CU2T connector units.