Yokogawa ALF111-S50 Fieldbus Communication Module

The Yokogawa ALF111-S50 is a robust and advanced Fieldbus communication module developed for seamless integration into Yokogawa’s distributed control systems, notably CENTUM VP and STARDOM. As part of the ALF111 series, the S50 variant is engineered to support FOUNDATION™ Fieldbus H1 protocol with enhanced performance features, enabling real-time data communication and control between host systems and field devices in critical industrial environments.

This model provides a high-reliability interface with support for dual H1 Fieldbus segments, which is critical for redundant or high-availability network architectures. It is designed to endure harsh conditions and maintain stable communication under fluctuating temperature and voltage environments. The ALF111-S50 is a cornerstone for modern digital plant architectures seeking efficiency, scalability, and diagnostic insight.

Specifications

Applications

The ALF111-S50 is a critical component across multiple industrial sectors due to its flexibility, reliability, and digital integration capabilities. It plays a pivotal role in the following fields:

• Oil & Gas: Manages digital communication with smart field devices in refineries and upstream platforms, providing efficient diagnostics and high data accuracy.

• Chemical and Petrochemical: Enables real-time monitoring of corrosive or hazardous processes using digital sensors.

• Power Generation: Supports process control in steam turbine systems, boilers, and auxiliary power plant units.

• Pharmaceutical Manufacturing: Facilitates compliance with validation and documentation requirements through intelligent device communication.

• Water and Wastewater Treatment: Ensures uninterrupted control and remote diagnostics for pumps, flow meters, and control valves.

• Food and Beverage: Maintains stringent process control and data traceability for quality assurance and batch production.

Advantages

• Dual Segment Operation

  The ALF111-S50 supports two completely independent FOUNDATION™ Fieldbus segments, enabling cost-efficient infrastructure and greater flexibility in system design.

• Enhanced Diagnostics

  Integrated advanced diagnostics detect abnormal behavior in both devices and communication networks, helping reduce unplanned downtime and maintenance costs.

• Robust Industrial Design

  Built to withstand harsh industrial conditions, including high humidity, extreme temperatures, and potential corrosion environments.

• Compact Form Factor

  The small footprint makes it ideal for installations in control cabinets or field enclosures with space constraints.

• Scalable Architecture

  Designed to support scalable control systems, from compact STARDOM configurations to large-scale CENTUM VP deployments.

• Cost Savings

  By supporting multiple devices per segment and minimizing wiring requirements, the ALF111-S50 contributes to lower installation and operational costs.

• Energy Efficient

  Optimized for low-power operation, reducing overall system energy consumption without compromising performance.

• Vendor-Neutral Integration

  Works with a wide range of FOUNDATION™ Fieldbus-certified field devices from multiple manufacturers.

FAQ

1. What protocol does the ALF111-S50 use for communication?

   It uses the FOUNDATION™ Fieldbus H1 protocol for two-way digital communication.

2. Can this module be integrated with legacy Yokogawa control systems?

   Yes, it supports integration with both CENTUM VP and STARDOM platforms.

3. How many Fieldbus segments does it support?

   It supports two completely independent H1 segments, suitable for connecting multiple field devices.

4. What is the recommended power supply for the module?

   The ALF111-S50 requires a 24V DC supply within ±10% tolerance.

5. Does it provide any diagnostics for connected devices?

   Yes, it supports advanced diagnostics, including segment health and individual device status.

6. Is it suitable for hazardous environments?

   Select variants are available with ATEX certification for use in hazardous or explosive zones.

7. What’s the temperature range for operation?

   The operating range is from -20°C to +60°C, ensuring reliability in most industrial environments.

8. How is the module installed?

   It is designed for DIN rail mounting, making it easy to install in standard enclosures.

9. Can it power the connected field devices?

   Yes, it provides internal regulated power to connected fieldbus devices per segment.

10. Is Yokogawa the only brand compatible with this module?

    No, it works with any FOUNDATION™ Fieldbus-compliant devices from other vendors as well.