Yokogawa ALF111 FOUNDATION Fieldbus Communication Module for High-Performance Field Network Integration
Yokogawa ALF111 FOUNDATION Fieldbus Communication Module for High-Performance Field Network Integration
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Brand:Yokogawa Electric Item No.:Yokogawa ALF111 Product Origin:Japan Product Dimensions:130 × 125.5 × 32.8 mm Product Weight:0.40 kg Payment:T/T, Western Union, Credit Card Goods_stock:15 Shipping Port:Xiamen, China Lead Time:1-3 Days Condition:Brand New And Original Warranty:1 Year Certificate:COO
The Yokogawa ALF111 is a FOUNDATION Fieldbus communication module engineered for deterministic field device networking within advanced distributed control systems. This module acts as a Link Active Scheduler (LAS), managing bidirectional communication between field instruments such as transmitters, valve positioners, and field controllers using the FOUNDATION™ Fieldbus H1 protocol. Its rugged industrial design ensures reliable and stable field communication essential for modern process automation architectures.
Technical Specifications
Parameter
Specification
Model
ALF111
Product Type
FOUNDATION Fieldbus Communication Module
Communication Protocol
FOUNDATION Fieldbus H1 (Low-speed voltage mode)
Communication Ports
4 Ports (1 segment per port)
Transmission Speed
31.25 kbps
Max Fieldbus Devices
Up to 32 devices per segment
Max Control I/O Points
Up to 48 points per segment
Communication Functions
Link Active Scheduler (LAS), Clock Master
Redundancy Support
Dual-module redundancy support
Bus Connection
Pressure clamp terminals with switchable terminators
Installation
Rack mount on compatible node or field control units
Withstanding Voltage
1500 V AC field-to-system and channel-to-channel
Operating Environment
Standard industrial temperature & humidity
Dimensions (L × W × H)
130 × 125.5 × 32.8 mm
Weight
0.40 kg
This module complies with FOUNDATION Fieldbus system requirements and is designed for integration into nodes such as ANB10, ANB11, AFV30, AFV40, A2FV50, and A2FV70.
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Applications
The ALF111 module is widely used for:
Fieldbus networking between distributed field devices and controllers
FOUNDATION Fieldbus segment management in process automation
Data collection for field diagnostics and advanced device monitoring
Redundant field communication infrastructure in critical systems
Integration with CENTUM VP and CENTUM CS 3000 automation architectures
By serving as the LAS, the ALF111 ensures that commands, status updates, and diagnostic information are exchanged predictably and reliably over FOUNDATION Fieldbus networks, essential for smooth process control.
Advantages
Deterministic Fieldbus Coordination
As an LAS, it orchestrates time-synchronized communication across field segments, minimizing collisions and ensuring consistent data flow.
Scalable Segment Support
With 4 independent ports, it enables flexible installation of multiple segments, each capable of supporting numerous devices.
Redundancy-Ready Design
Dual module redundancy ensures high availability and continuous operation in demanding plants.
Compact & Industrial-Grade
Sized for ease of rack installation yet robust enough for prolonged industrial use.
Proven Integration with Yokogawa Systems
Designed to integrate seamlessly with Yokogawa node units and field control stations, reducing engineering complexity.
Technical FAQs
1. What communication protocol does ALF111 use?
It uses FOUNDATION Fieldbus H1 for industrial field network communication.
2. What is the role of the Link Active Scheduler (LAS)?
LAS manages timing and data exchange between field devices on a Fieldbus segment.
3. How many devices can connect to one segment?
Up to 32 FOUNDATION Fieldbus devices per port/segment.
4. Can this module be used in redundant fieldbus networks?
Yes, two modules can be installed for dual redundancy.
5. What systems is it compatible with?
It integrates with CENTUM VP and similar Yokogawa control environments.
6. How is the bus terminated?
Pressure clamp terminals include built-in switchable terminators.
7. What is the operating speed of the fieldbus?
Standard H1 communication at 31.25 kbps.
8. Does the ALF111 support diagnostics?
Yes, it enables field device status reporting and diagnostic data exchange.
9. What is the module’s typical weight?
Approximately 0.40 kg.
10. How many I/O channels can be aggregated per segment?
Up to 48 control I/O points can be mapped per segment.
