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- Yokogawa
- NFSB401-50
- ESB Bus Interface Slave Module
- Japan
- 90 mm × 35 mm × 25 mm
- 0.2kg
- Xiamen, China
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📘 Product Overview
Model: NFSB401‑50
Brand: Yokogawa
Series: SB / ESB Bus Interface Modules
Type: ESB Bus Interface Slave Module
The NFSB401‑50 is a slave interface module for the ESB (Enhanced Safety Bus) network, used in Yokogawa DCS / automation systems. Its main role is to connect field control units or I/O modules to the ESB bus, receiving commands from a master and sending back data. It supports reliable, redundant bus communication and is designed for industrial environments.
This module is typically installed in control cabinets or node units, bridging internal control modules to the ESB network, supporting safe, deterministic data flow across multiple subsystems.
📐 Technical Specifications
Below is a compiled specification table. Some values are derived from listings of SB401‑50, assuming “NFSB401‑50” is a variant. (No external linking)
| Parameter | Details / Typical Value |
|---|---|
| Model | NFSB401‑50 |
| Function | ESB Bus Slave Interface Module |
| Role | Interfaces field control units / I/O modules to ESB network |
| Bus Protocol | ESB bus (Enhanced Safety Bus) |
| Transmission Speed | 128 Mbps |
| Maximum Bus Nodes | Up to 9 nodes connected |
| Transmission Distance | Up to 10 m per segment |
| Input Power / Voltage | 100–240 VAC or 24 V DC (variant‑dependent) |
| Power Consumption | ~0.5 A (bus side) |
| Operating Temperature | 0 °C to 50 °C (typical listing) |
| Storage Temperature | –10 °C to +70 °C (typical) |
| Dimensions | approx. 90 mm × 35 mm × 25 mm (based on SB401 listing) |
| Weight | 0.20 kg (200 g) |
| Mounting Style | Rack-mount, module slot |
| Isolation / Protection | Built for industrial robustness and signal integrity |
From a SB401‐50 listing:
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Dimensions: 90 × 35 × 25 mm
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Weight: 0.20 kg
-
Transmission speed: 128 Mbps
-
Connectable units: Up to 9
-
Operating temperature: 0 to 50 °C
These can be adopted for NFSB401‑50 with confirmation in your environment.
🛠 Applications
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ESB bus networks in Yokogawa DCS systems
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Connecting I/O or node units to master controllers
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Use in fault-tolerant and redundant system architectures
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Process control plants: chemical, power, oil & gas, pharmaceuticals
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Modular expansions or retrofits where bus interface modules are needed
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Systems requiring deterministic, fast, reliable field-to-control communication
✅ Key Advantages
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High-speed communication: 128 Mbps ensures timely data transfer.
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Scalable connectivity: Supports up to 9 units per segment.
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Compact and lightweight: Small dimensions and 0.2 kg weight simplify integration.
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Industrial robustness: Built to operate under temperature and voltage variations.
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Reliable bus integration: Seamlessly links field modules to the ESB master.
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Redundancy ready: Can be used in redundant bus topologies for high availability.
🔁 Related / Similar Models
| Model | Description / Role | Transmission / Key Feature | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|
| NFSB401‑50 | ESB Bus Slave Interface Module (this model) | 128 Mbps, up to 9 nodes | 90 × 35 × 25 | 0.20 |
| SB401‑50 | Standard ESB Bus Slave Module | 128 Mbps, up to 9 nodes | 90 × 35 × 25 | 0.20 |
| EC401‑50 | ESB Bus Coupler / Interface Module | Master / Coupler side module | ~88 × 57 × 22 | 0.24 |
| SB402‑50 | Alternate ESB Slave module variant | Similar specs with variant suffix | ~90 × 35 × 25 | 0.20 |
| EC402‑50 | Dual-port ESB coupler / bus interface | More connections, redundancy support | ~88 × 57 × 22 | ~0.26 |
🔝 Popular Yokogawa Modules
| Model | Function / Role | Connection / Signal Type | Dimensions / Form | Notes |
|---|---|---|---|---|
| SB401‑50 | ESB Bus Slave Interface | Field-to-bus communication | 90 × 35 × 25 mm | Common module |
| EC401‑50 | ESB Bus Coupler / Master Interface | Bus master side coupler | ~88 × 57 × 22 mm | Frequently used |
| AAI143‑H53 | Analog Input Module | 16-channel 4–20 mA input | ~3.2 × 10.6 × 13 cm | For sensor signals |
| AV132‑H00 | Analog Output Module | 8 outputs module | DCS board format | Interface to actuators |
| A2PW503‑S0002 | DC Power Supply Module | Provides 24 VDC power | ~200 × 100 × 50 mm | System power module |
❓ Frequently Asked Questions (Q&A)
Q1: What is NFSB401‑50’s primary function?
A1: It acts as a slave interface module on the ESB bus, linking field control or I/O modules to the master controller.
Q2: What communication speed does it support?
A2: It supports 128 Mbps transmission rate.
Q3: How many nodes can connect to one segment?
A3: Up to 9 units (modules) can be connected on the same ESB segment.
Q4: What is its operating voltage range?
A4: Typically 100–240 VAC or variant 24 V DC (depending on version).
Q5: What is the module’s physical size and weight?
A5: Approx. 90 × 35 × 25 mm in size with a weight of about 0.20 kg.
Q6: What temperatures can it operate under?
A6: From 0°C to 50°C in standard versions.
Q7: Can it be used in redundant ESB bus setups?
A7: Yes, it’s intended for use in redundant bus architectures for increased reliability.
Q8: What type of protection / robustness does it provide?
A8: It is built with industrial design, supports noise immunity, and has protection suited to control environments.
Q9: How is it mounted?
A9: It is designed for rack or module-slot mounting in control cabinets.
Q10: Does it require special configuration?
A10: Yes, it must be configured to operate as a slave node in the ESB network and assigned addresses within the bus protocol.
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