Product Overview
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
| Parameter | Specification |
|---|---|
| Model Number | ALF111-S01 |
| Module Type | Foundation Fieldbus H1 Communication (LAS) Module |
| Interface | Foundation Fieldbus (Low-speed Voltage Mode) |
| Number of Ports / Segments | 4 ports (1 segment per port) |
| Transmission Speed | 31.25 kbps |
| Max Fieldbus Devices/Segment | Up to 32 devices (including ALF111 itself) |
| Max I/O Points per Segment | Up to 48 I/O points (scan cycle configurable) |
| Redundancy Support | Supports dual-module redundancy |
| Withstanding Voltage | 1500 VAC for 1 minute (channel-to-system isolation) |
| Power Supply | 24 V DC ±10% |
| Power Consumption | Approx. 4.5 W max |
| Current Consumption | ≤ 0.5 A |
| Dimensions | 88 × 58 × 23 mm |
| Weight | 0.15 kg |
| Mounting | Compatible with AFV30/AFV40/A2FV50/A2FV70, ANB10/11 |
| Communication Functions | LAS, Clock Master |
| Certifications / Standards | IEC 61158‑2, EN 50173, UL 508 |
Industry Applications
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Acts as the communication gateway between Yokogawa FCS and Fieldbus devices
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Manages time scheduling and data exchange for process control loops
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Supports redundant operation in high-availability control systems
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Used in oil & gas, petrochemical, power generation, water treatment, and manufacturing
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Ideal for centralized LAS role in distributed control system architecture
Key Advantages
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Reliable LAS functionality ensures deterministic communication
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Dual redundancy support enhances system reliability
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Compact and lightweight design for easy panel installation
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High device capacity: Up to 32 devices and 48 I/O points per segment
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Industrial-grade isolation with 1500 VAC withstand voltage
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Low power consumption improves overall system efficiency
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Seamless integration with Yokogawa control platforms and third-party FF devices
Frequently Asked Questions (FAQ)
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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. -
How many devices can be connected per segment?
Up to 32 devices, including the ALF111 module itself. -
What is the communication speed?
It operates at 31.25 kbps per Foundation Fieldbus H1 standards. -
Does it support redundancy?
Yes, it can be installed in redundant configurations for critical systems. -
What are the dimensions and weight?
The module measures 88 × 58 × 23 mm and weighs approximately 150 g. -
What are the power requirements?
It requires 24 V DC ±10%, with max power consumption of around 4.5 W. -
What standards does it comply with?
It complies with IEC 61158-2, EN 50173, and UL 508. -
Where can it be mounted?
It is compatible with AFV30, AFV40, A2FV50, A2FV70, and ANB10/11 stations. -
How many I/O points can each segment handle?
Up to 48 I/O points per segment can be configured. -
How is wiring handled for fieldbus connections?
It uses crimped terminals and detachable terminal blocks; termination resistors are switchable for ease of installation.
Related Models
| Model Number | Description |
|---|---|
| ALF111‑S00 S1 | Standard Foundation Fieldbus Communication Module |
| ALP111‑S00 | Fieldbus Power Supply/Connection Module |
| ALE111‑S51 | Ethernet Communication Module |
| ALD112‑S00 | DeviceNet Communication Module |
| ALF111‑E | Explosion-proof Foundation Fieldbus Module |
| ALF111‑S01 Dual | Redundant configuration for ALF111-S01 |
Popular Yokogawa Models
| Model Number | Description |
|---|---|
| CENTUM VP Controller | Yokogawa DCS Controller |
| AAV141‑S00 | S2 Analog Input Module |
| ADV561‑P00 | S2 Digital Output Module |
| ALE111‑S51‑S1 | Ethernet Communication Module |
| ALD112‑S00 S1 | DeviceNet Communication Module |
| AAT141‑S03 | High-precision Analog Input Module |
Company Information
E-mail: [email protected]
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Add: Alishan Building, 2 Lvling Rd, Siming District, Xiamen, Fujian, China, 361006
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