NFSB100-S50/SBT02

The Yokogawa NFSB100-S50/SBT02 is an SB bus repeater module for the FCN (Field Control Node) platform. It repeats serial communication signals between SB bus segments and supports single or duplex bus configurations. The specified configuration includes an SB bus T-joint with a built-in terminator, identified by the /SBT02 suffix.

Communication and Bus Extension

The NFSB100 extends the SB bus communication path between FCN units. Its specified transmission distance is up to 8 m per line, with support for a maximum of two extension units, or three units when the control unit is included.

The module supports a duplex configuration, allowing it to be used in systems designed with a duplexed SB bus. The installation slot depends on the bus arrangement and must be selected accordingly.

Duplex Configuration and Installation

For a duplexed SB bus, two NFSB100 modules are required per unit. Each module connects to the corresponding bus through a dedicated SB bus cable and T-joint. The /SBT02 option incorporates a T-joint with a built-in terminator. Yokogawa specifies termination at both ends of the SB bus when connecting the control unit and extension units.

The module occupies one slot. Install it in slot 10 for a single SB bus or slots 9 and 10 for a duplexed SB bus. It is designed for the NFBU200 long base module and is not compatible with the short NFBU050 or compact N2BU030 base modules.

Power Supply and Physical Characteristics

The NFSB100 receives its operating power from the FCN base module. Its specified supply voltage is 5 V DC +/-5%, with a maximum current dissipation of 500 mA. The module has a single-slot form factor and a weight of 0.2 kg, which should be considered when checking cabinet space and base-module loading.

Model and Suffix Identification

The ordering code NFSB100-S50/SBT02 identifies the following configuration:

Code	Description
NFSB100	SB bus repeat module for FCN
-S	Standard model
5	With no explosion protection
0	Basic type
/SBT02	With an SB bus T-joint with built-in terminator

The /SBT02 option distinguishes this configuration from /SBT01, which specifies an SB bus T-joint without the built-in terminator.

Technical Specifications

Parameter	Specification
Model	NFSB100-S50/SBT02
Brand	Yokogawa
Product Type	SB Bus Repeater Module
Application	FCN
Transmission Method	Serial communication
Baud Rate	128 Mbps
Transmission Distance	Max. 8 m per line
Maximum Extension Units	2 units (3 units including a control unit)
Duplex Configuration	Possible
Supply Voltage	5 V DC +/-5%
Current Dissipation	Max. 500 mA
Occupying Slots	1
Installation Slot	Slot No. 10 (single SB bus); Slot Nos. 9 and 10 (duplexed SB bus)
Dimensions (W x H x D)	32.8 x 130 x 142.5 mm
Weight	0.2 kg

Frequently Asked Questions

Q: Can the NFSB100-S50/SBT02 be used in a duplexed SB bus configuration?

A: Yes. Two SB bus repeat modules are required for each unit in a duplexed configuration. They are installed in slots 9 and 10 and connected through the dedicated SB bus cabling.

Q: What is the difference between NFSB100-S50/SBT01 and NFSB100-S50/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: Which FCN base module supports the NFSB100?

A: The NFSB100 is designed for the NFBU200 long base module. It cannot be installed on the NFBU050 short base module or N2BU030 compact base module.

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