NFBU200-S01

The Yokogawa NFBU200-S01 is a base module for the FCN (Field Control Node) controller platform. It provides the mounting structure and internal backplane connections for CPU, power supply, and I/O function modules. The NFBU200 long-type base module supports modular controller configurations, with dedicated power supply positions and function-module slots.

Functional Role in the FCN System

The base module acts as the mechanical and electrical foundation of the controller assembly. Its internal SB bus provides the connection between installed modules, allowing the CPU and I/O modules to operate as part of the same control unit.

The NFBU200 long-type platform has 10 module positions: two power supply slots and ten function-module positions in the overall slot arrangement. In a standard control-unit configuration, two positions are reserved for the CPU, leaving capacity for up to 8 I/O modules. Actual capacity changes with CPU and bus-repeater redundancy configurations.

Technical Specifications

Parameter	Specification
Model	NFBU200-S01
Brand	Yokogawa
Product Type	FCN Base Module (Long Type)
Controller Platform	FCN Autonomous Controller
Power Supply Slots	2
Function Module Slots	10
Maximum I/O Modules	8 in a standard control-unit configuration
Internal Bus	SB bus
Mounting	NFBU200 supports 19-inch rack or DIN rail versions; exact S01 configuration requires confirmation
Weight	1.9 kg
Dimensions	482.6 x 132.5 x 40.5 mm
Maximum 5 V Self-Consumption	0.4 A
24 V Self-Consumption	0 A

Module Configuration and Redundancy

The two power supply positions allow a redundant power supply arrangement when the specified compatible power supply modules are installed. CPU and SB bus configurations also affect the number of available I/O positions. Therefore, the maximum I/O count should be checked against the complete controller configuration rather than treated as a fixed capacity for every arrangement.

Unused module positions require the appropriate dummy covers. Yokogawa identifies NFDCV01 for unused I/O module slots and NFDCV02 for unused power supply slots. These accessories should be considered when checking the completeness of a base module assembly.

Frequently Asked Questions

Q: How many I/O modules can the NFBU200 accommodate?

A: Up to 8 I/O modules can be installed in a standard control-unit configuration. CPU redundancy and SB bus repeater configurations occupy additional slots and reduce the available I/O capacity.

Q: Does the NFBU200 support redundant power supplies?

A: Yes. Its two power supply slots support a redundant arrangement with the specified compatible power supply module. The exact power supply model must be checked against the controller configuration.

Q: Are dummy covers required for unused slots?

A: Yes. Use NFDCV01 for unused I/O slots and NFDCV02 for unused power supply slots, as specified by Yokogawa.

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