Configured for dual-redundant ESB bus communication in CENTUM VP systems, the Yokogawa ANB10D-425/CU2T (ANB10D ESB Bus Node Unit) provides direct physical/electrical execution. It interfaces between peripheral field I/O modules and the Field Control Unit (FCU), ensuring data transmission across 2 Mbps bus channels. This node unit integrates a dedicated physical termination assembly (/CU2T option) to stabilize bus impedances and suppress signal reflections over physical communication lengths up to 2 km.
The alphanumeric suffix configurations for the ANB10D series dictate specific factory-built hardware parameters:
| Parameter | Specification |
|---|---|
| Model | ANB10D-425/CU2T |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 10 kg (Shipping Weight: 12 kg) |
| Dimensions | Standard 19-inch rack mountable |
| Operating Temp | -20 to +60 deg C |
| Power Consumption | 200 VA (100-120 V AC), 230 VA (220-240 V AC), 5.5 A (24 V DC) |
| Input Channels | 10 channels (digital input) |
| Input Signal Type | Dry contact, NPN/PNP transistor input |
| Input Voltage Range | 12-24 V DC |
| Input Current | Less than or equal to 8 mA per channel |
| Response Time | Less than or equal to 5 ms (on/off) |
| Isolation | 1000 V AC (channel-to-system, channel-to-channel) |
| Bus Architecture | Dual-redundant ESB bus, less than or equal to 10 ms failover |
| Communication Protocols | V-net, TCP/IP, OPC UA |
| I/O Expansion Capacity | Up to 128 modules |
| Vibration Resistance | Up to 15 g |
Operating within a Yokogawa DCS framework, this unit regulates multi-channel data flow through 1000 V AC galvanic isolation boundaries that isolate the field-side loops from the internal processing backplane. The field communication ports handle direct transmitter interfaces, using 4-20 mA HART loop protocol parameters to extract primary process variables. The physical design integrates channel-to-channel isolation to prevent electrical interference from disrupting analog input loops. Where thermal instrumentation is connected, standard cold junction compensation (CJC) takes place at the terminal block, maintaining system loop integrity.
Q: What is the mechanical function of the /CU2T option on this node unit?
A: The /CU2T option installs a hardware connector unit equipped with a built-in electrical terminator. This terminator matches the characteristic impedance of the ESB bus, preventing wave reflections along long-distance cable runs.
Q: How does the dual-redundant power supply handle input voltage fluctuations?
A: The dual-redundant power supply modules accept a wide voltage tolerance. If one supply drops below the threshold, the secondary power supply assumes the full electrical load within a bumpless window, sustaining normal operations without module downtime.
Q: Does this model support hot-swapping of standard I/O cards?
A: Yes, standard I/O cards mounted within the 8-slot chassis can be hot-swapped while the node remains energized, provided the backplane communications remain active and standard ESD safety precautions are implemented.
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