The YOKOGAWA NFSB100-S50/SBT02 (NFSB100) operates as a high-speed bus repeat module within industrial control architectures. It is engineered to extend the physical distance and maintain signal integrity of the SB bus, ensuring deterministic data exchange between controllers and remote I/O nodes.

Suffix Breakdown & Model Matrix

The NFSB100-S50/SBT02 utilizes a specific configuration matrix for deployment:

• -S50: Identifies the standard high-speed bus repeat interface configuration.
• SBT02: Denotes the specific revision level and base terminal style, ensuring compatibility with the standardized Yokogawa cabling and mounting hardware used in the STARDOM and related automation platforms.

Hardware Specifications

SB Bus Signal Regeneration and Transmission

The NFSB100 module is required to maintain the signal-to-noise ratio in systems where the SB bus must traverse large cabinet layouts or span across multiple enclosures. It performs active signal regeneration, effectively acting as a repeater to compensate for transmission losses and electromagnetic interference. By supporting duplexed configurations, the module provides a fault-tolerant path for critical process data, ensuring that communication remains active even in the event of a single-link failure.

Frequently Asked Questions

Q: Can the NFSB100-S50/SBT02 be used in a simplex configuration?

A: While the module supports duplexed configurations for high-availability requirements, it can also be used in simplex setups. Always refer to the specific system documentation to ensure that the bus termination settings are correct for the chosen topology.

Q: Is this module compatible with standard STARDOM expansion racks?

A: Yes. The NFSB100 is specifically designed for integration into STARDOM controller architectures. It facilitates the expansion of the high-speed SB bus to distant racks, provided the cumulative length does not exceed the protocol-defined maximums.

Field Installation Guidelines

1. DIN-rail Mounting: Secure the NFSB100 to a grounded 35 mm DIN-rail. Ensure the mechanical locking tab is engaged to provide a low-resistance path for chassis grounding, which is necessary for EMI/RFI suppression.
2. Signal Wiring: Use shielded twisted-pair cabling for SB bus connections. Maintain a minimum separation of 300 mm from high-voltage power lines and VFD output cables to prevent induced noise on the data lines.
3. Power Termination: Ensure the 24 VDC power source is properly fused at the supply level to protect the module from overcurrent conditions. Double-check polarity before energizing the module.
4. Thermal Clearance: Maintain a minimum clearance of 50 mm above and below the module to allow for adequate convective cooling. This ensures the module remains within its rated 0 deg C to 55 deg C operating temperature range during heavy communication loads.