The Yokogawa ALF111-S01 is a Foundation™ Fieldbus H1 communication module that functions as a Link Active Scheduler (LAS) within Yokogawa’s Field Control Station (FCS) systems. Designed to interface with up to 32 field devices, it manages time synchronization and data exchange on each segment. The module supports dual-redundant operation, making it suitable for critical industrial control environments.

Technical Specifications

Industry Applications

• Acts as the communication gateway between Yokogawa FCS and Fieldbus devices

• Manages time scheduling and data exchange for process control loops

• Supports redundant operation in high-availability control systems

• Used in oil & gas, petrochemical, power generation, water treatment, and manufacturing

• Ideal for centralized LAS role in distributed control system architecture

Key Advantages

• Reliable LAS functionality ensures deterministic communication

• Dual redundancy support enhances system reliability

• Compact and lightweight design for easy panel installation

• High device capacity: Up to 32 devices and 48 I/O points per segment

• Industrial-grade isolation with 1500 VAC withstand voltage

• Low power consumption improves overall system efficiency

• Seamless integration with Yokogawa control platforms and third-party FF devices

Frequently Asked Questions (FAQ)

1. What is the function of the ALF111-S01 module?

   It acts as a Link Active Scheduler (LAS) for Foundation Fieldbus H1, managing communication and timing.

2. How many devices can be connected per segment?

   Up to 32 devices, including the ALF111 module itself.

3. What is the communication speed?

   It operates at 31.25 kbps per Foundation Fieldbus H1 standards.

4. Does it support redundancy?

   Yes, it can be installed in redundant configurations for critical systems.

5. What are the dimensions and weight?

   The module measures 88 × 58 × 23 mm and weighs approximately 150 g.

6. What are the power requirements?

   It requires 24 V DC ±10%, with max power consumption of around 4.5 W.

7. What standards does it comply with?

   It complies with IEC 61158-2, EN 50173, and UL 508.

8. Where can it be mounted?

   It is compatible with AFV30, AFV40, A2FV50, A2FV70, and ANB10/11 stations.

9. How many I/O points can each segment handle?

   Up to 48 I/O points per segment can be configured.

10. How is wiring handled for fieldbus connections?

    It uses crimped terminals and detachable terminal blocks; termination resistors are switchable for ease of installation.