NFSB100-S0/SBT01

The Yokogawa NFSB100-S0/SBT01 is an SB Bus repeat module designed for FCN autonomous controllers. It connects an FCN control unit to I/O extension units through a dedicated SB Bus communication link. This configuration includes an SB Bus T-joint, supporting the connection between repeat modules and the associated bus cable.

Function and Communication

The NFSB100 repeats serial communication between the FCN control unit and its I/O extension units. It supports an SB Bus transmission rate of 128 Mbps, with a maximum transmission distance of 8 m per line.

For systems requiring a duplexed SB Bus, two repeat modules can be installed in each unit. Each module connects to the corresponding bus through a dedicated T-joint and cable.

Connection and Termination

The /SBT01 option identifies the supplied SB Bus T-joint. It is distinct from /SBT02, which specifies a T-joint with a built-in terminator.

When connecting the control unit and extension units, Yokogawa specifies termination at both ends of each SB Bus using T-joints with built-in terminators. Therefore, the /SBT01 configuration should not be mistaken for a termination-equipped connection.

Technical Specifications

Parameter	Specification
Model	NFSB100-S0/SBT01
Brand	Yokogawa
Product Type	SB Bus Repeat Module
Controller Platform	FCN
Transmission Method	Serial communication
Transmission Rate	128 Mbps
Maximum Transmission Distance	8 m per line
Maximum Extension Units	2 (3 units including the control unit)
Bus Configuration	Single or duplex
Supply Voltage	5 V DC +/-5%
Current Dissipation	Max. 500 mA
Weight	0.2 kg
Dimensions (W x H x D)	32.8 x 130 x 142.5 mm
Occupied Slots	1
Single SB Bus Slot	Slot No. 10
Duplexed SB Bus Slots	Slot Nos. 9 and 10

Specifications are based on Yokogawa General Specifications GS 34P02Q14-01E.

Status Indicators

The module provides three green LED indicators for checking hardware and communication activity:

• STATUS: Lights when the hardware is operating normally.
• SND: Indicates active data transmission.
• RCV: Indicates data reception.

These indicators help maintenance personnel distinguish hardware status from transmission and reception activity during system checks.

Installation and Configuration Notes

The NFSB100 SB Bus repeat module is specified for the NFBU200 base module. Yokogawa's FCN-500 documentation allows up to two extension units through the SB Bus architecture. The SB Bus repeat module and E2 Bus interface module cannot be used together in the same configuration.

Frequently Asked Questions

Q: What is the difference between NFSB100-S0/SBT01 and NFSB100-S0/SBT02?

A: The difference is the supplied T-joint configuration. /SBT01 includes an SB Bus T-joint, while /SBT02 includes a T-joint with a built-in terminator.

Q: Can the NFSB100 support a redundant SB Bus configuration?

A: Yes. Two SB Bus repeat modules can be installed in each base module to provide a duplexed SB Bus. The corresponding modules are installed in slots 9 and 10 on the NFBU200 base module.

Q: How many extension units can be connected through the SB Bus?

A: Up to two extension units can be connected, giving a maximum configuration of three units when the control unit is included. The maximum transmission distance is 8 m per line.

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