NFBU200-S15

The Yokogawa NFBU200-S15 is a DIN rail-mounted base module designed to accommodate power supply modules and I/O modules within a Yokogawa control system. It provides two power supply slots and ten I/O slots, with a duplex SB bus (internal backboard bus). The base supports single or duplex power supply configurations, with the maximum I/O module count dependent on the CPU configuration.

Technical Specifications

Parameter	Specification
Model	NFBU200-S15
Brand	Yokogawa
Product Type	Base Module
Mounting Type	DIN rail-mounted
Module Type	Standard type
Explosion Protection	Basic type, no explosion protection
Power Supply Slots	2
I/O Slots	10
SB Bus (Internal Backboard Bus)	Duplex
Power Supply Configuration	Single or duplexed
Maximum I/O Modules - Single CPU	8
Maximum I/O Modules - Duplex CPU	6

Slot Configuration and System Architecture

The NFBU200-S15 provides separate positions for power supply modules and I/O modules. Its two power supply slots allow a single or duplexed power supply arrangement, depending on the system configuration. The duplex SB bus provides the internal backboard connection between installed modules.

The base has ten physical I/O slots, but the usable I/O module count is also subject to the CPU configuration. The specified maximum is eight I/O modules with a single CPU and six with a duplex CPU. Therefore, physical slot capacity should not be interpreted as the maximum number of supported I/O modules in every configuration.

Model Suffix Identification

The ordering code NFBU200-S15 identifies the mounting and protection configuration:

• NFBU200: Long base module.
• -S: Standard type.
• 1: DIN rail-mounted.
• 5: Basic type without explosion protection.

This configuration is intended for installations requiring DIN rail mounting without the explosion-protection option. The suffix should be checked when identifying replacement hardware, as other NFBU200 variants have different mounting or protection configurations.

Physical Specifications

The DIN rail-mounted NFBU200 has a specified weight of 1.0 kg and dimensions of 440 x 131 x 42.3 mm. These dimensions are useful when checking cabinet clearance and replacement fit.

Frequently Asked Questions

Q: How many I/O modules can the NFBU200-S15 support?

A: The maximum is 8 I/O modules with a single CPU configuration and 6 with duplexed CPUs when configured as a standalone control unit. The actual number of available positions also depends on the modules occupying the base.

Q: Does the NFBU200-S15 support redundant power supplies?

A: Yes. Its two power supply slots support single or duplexed power supply configurations.

Q: Is the NFBU200-S15 suitable for explosion-protected installations?

A: No. The suffix 5 identifies the basic version without explosion protection. An explosion-protected configuration requires a different suffix and appropriate system-level installation conditions.

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