Yokogawa ALF111‑S50 FOUNDATION Fieldbus Communication Module for Scalable Field Device Networking
Yokogawa ALF111‑S50 FOUNDATION Fieldbus Communication Module for Scalable Field Device Networking
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Brand:Yokogawa Electric Item No.:Yokogawa ALF111‑S50 Product Origin:Japan Product Dimensions:260 × 180 × 60 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‑S50 is a dedicated FOUNDATION Fieldbus communication module engineered to manage reliable field network interaction in advanced industrial automation systems. It serves as a Link Active Scheduler (LAS) and Clock Master, coordinating fieldbus traffic and timing across multiple segments for synchronized data exchange between controllers and field devices. This module enables stable, deterministic communication essential for modern process plants that rely on FOUNDATION Fieldbus H1 architectures for distributed I/O and device diagnostics.
Technical Specifications
Parameter
Specification
Model
ALF111‑S50
Product Type
FOUNDATION Fieldbus Communication Module
Communication Protocol
FOUNDATION Fieldbus H1 (Low‑Speed Voltage Mode)
Communication Function
Link Active Scheduler (LAS), Clock Master
Number of Ports
4 (1 segment per port)
Transmission Speed
31.25 kbps
Maximum Fieldbus Devices
32 devices per segment
Maximum Control I/O Channels
48 points per segment
Bus Connection
Pressure clamp terminals with built‑in terminators
Redundancy Support
Dual module configuration capability
Isolation / Withstanding Voltage
1500 V AC field‑to‑system & channel‑to‑channel
Mounting Compatibility
Field control units and bus node units (e.g., ANB10, ANR10, AFF50, AFV30, AFV40)
Operating Temperature
–20 °C to +70 °C
Storage Temperature
Standard industrial conditions
Relative Humidity
Industrial range (non‑condensing)
Dimensions (L × W × H)
260 × 180 × 60 mm
Weight
0.40 kg
Specifications are typical industrial automation module values.
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Applications
The ALF111‑S50 is widely deployed in:
FOUNDATION Fieldbus H1 segment management for process control
Field device network coordination in petrochemical and oil & gas plants
Large‑scale distributed automation with high node count
Redundant fieldbus communication architectures
Systems requiring synchronized data exchange and device diagnostics
Functioning as the LAS, this module orchestrates deterministic communication timing and arbitration essential for consistent fieldbus performance in complex automation environments.
Advantages
Deterministic Communication Control
Serves as the LAS and Clock Master, ensuring predictable, loss‑free fieldbus traffic across segments.
Multi‑Segment Support
Four independent fieldbus ports allow scalable network segmentation to match plant layout needs.
Redundancy‑Ready Architecture
Supports dual module installation for high availability and continuous operation.
Wide Environmental Range
Designed for typical industrial temperature and humidity conditions, supporting reliable long‑term deployment.
Seamless Yokogawa Integration
Compatible with a broad range of Yokogawa node units and field control stations, reducing system engineering complexity.
Technical FAQs
1. What role does the ALF111‑S50 play in fieldbus networks?
It functions as the Link Active Scheduler and Clock Master for FOUNDATION Fieldbus segments.
2. How many ports and segments does it support?
It provides 4 independent ports, each serving one fieldbus segment.
3. What is the maximum fieldbus device capacity per segment?
Up to 32 FOUNDATION Fieldbus devices per segment.
4. Can it be used in redundant configurations?
Yes — dual modules can be configured in the same node for higher availability.
5. What transmission speed does it use?
Standard FOUNDATION Fieldbus H1 speed at 31.25 kbps.
6. What environmental conditions are supported?
Typical industrial operation from –20 °C to +70 °C with industrial humidity range.
7. Is isolation protection provided?
The module is designed with 1500 V AC isolation between field and system circuits.
8. What control I/O coverage does it permit?
Up to 48 control I/O channels per fieldbus segment.
9. What type of bus connection is used?
Pressure clamp terminals with built‑in terminators are used for secure connections.
10. Which Yokogawa units is this suited for?
Compatible with various field control units and bus node units such as ANB10, ANR10, AFF50, AFV30, and AFV40.
