ProductPRODUCT
Featured products
Contact Us
- Yokogawa
- ALF111-50
- Foundation Fieldbus Communication Module
- Japan
- 26.0 cm × 18.0 cm × 6.0 cm
- 0.4kg
- Xiamen, China
- New & In Stock
- T/T, PayPal, Western Union
- 1 Year
- 1-3 Working Days
- DHL, UPS, TNT, FedEx and EMS.
- 24-Hour Service
- COO
- 46
Our advantage
Global Logistics
We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.
Brand new and original
Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
24-hour service
We provide 7*24 hours service to our customers. We will be there whenever you need us.
Price advantage
All our products are priced very favorably because we have our own warehouse and supply.
| Company Information | |||
| sales@plc-automations.com | |||
| Mobile | +8615980777398 | ||
| +8615980777398 | |||
| 15980777398 |
Product Overview: Yokogawa ALF111‑50
Brand & Series
-
Brand: Yokogawa
-
Series: ALF111 Communication Module Series / FOUNDATION Fieldbus Communication Modules
Technical Specifications
Here are the specifications for ALF111‑S50 which likely closely match “ALF111‑50” (assuming same hardware except suffix differences), plus inferred features:
| Parameter | Specification |
|---|---|
| Model | ALF111‑50 (assumed equivalent to ALF111‑S50) |
| Type | FOUNDATION Fieldbus Communication Module |
| Protocol / Interface | FOUNDATION Fieldbus (H1), Low‑Speed Voltage Mode, 31.25 kbps |
| Functionality | Acts as Link Active Scheduler (LAS) and Clock Master for Fieldbus segment |
| Ports / Segments | 4 ports (one segment per port) |
| Max Devices per Segment | Up to 32 fieldbus devices (including the module) |
| Max Control I/O Points per Segment | Up to 48 I/O points |
| Bus Connections | Pressure‑clamp terminals; removable terminal block with built‑in terminators; switchable terminators on ports |
| Withstanding Voltage (Isolation) | ~ 1500 V AC for 1 minute (field ↔ system; channel ↔ channel) |
| Current Consumption | ≤ 0.5 A |
| Operating Temperature | ‑20 °C to +70 °C |
| Weight | ~ 0.40 kg |
| Dimensions (Width × Height × Depth) | ~ 26.0 cm × 18.0 cm × 6.0 cm |
| Redundancy Support | Dual‑redundant configuration possible for increased reliability |
| Mounting Compatibility | Compatible with node units such as ANB10, ANR10, AFF50, AFV10 (and their S / D variants) |
| Humidity | ~ 35% to 85% RH non‑condensing |
Product Description
The ALF111‑50 (or ALF111‑S50 variant) is a communication module for FOUNDATION Fieldbus (H1) networks. It is designed to link Field Control Stations (FCS) to field devices (e.g. transmitters, valve positioners etc.) using the H1 protocol. The module functions as the Link Active Scheduler (LAS) and Clock Master, managing and synchronizing communication among devices in a fieldbus segment. Each port supports one segment; multiple ports allow managing multiple segments.
Its design includes sturdy isolation, robust terminal connections, built‑in terminators (switchable), redundancy options, and ability to handle up to 32 devices per segment and up to 48 I/O points. It is meant for industrial environments, with moderate ambient temperature and humidity ratings.
Applications
-
FOUNDATION Fieldbus system setups in process control plants (chemical, petrochemical, oil & gas, water treatment etc.)
-
Where multiple fieldbus devices need coordinated communication and scheduling on H1 segments
-
Situations needing synchronized clock sharing and reliable bus management (LAS role)
-
Nodes and control units that require redundancy to avoid communication failure
-
Retrofits or new installations using FIO / Field I/O / Bus Node Units with ALF111 compatible slots
Advantages
-
Acts as LAS + Clock Master → simplifies network design and ensures temporal synchronization
-
Supports up to 32 devices & 48 control I/O points per segment → high device density
-
Robust isolation and withstanding voltage → protection against electrical faults
-
Multiple ports (4 segments) → flexibility and network segmentation
-
Compatible with various node units (ANB10, ANR10 etc.) → hardware reuse / easier replacement
-
Weight and size are modest for its capability, easier handling & installation
Similar / Related Models & Popular Yokogawa Modules
Below are tables comparing similar or related communication modules, and other popular modules from Yokogawa.
Related / Same Series Models
| Model | Key Differences / Features | Dimensions / Weight Approx. |
|---|---|---|
| ALF111‑S50 | Standard type; basic model without explosion‑proof rating | 26.0×18.0×6.0 cm; 0.40 kg |
| ALF111‑S00 | Earlier variant; basic functions, maybe fewer ports or simpler terminal block | Weight ~0.3‑0.4 kg; dimensions comparable |
| ALF111‑S51 | Suffix variant with options (terminal block type, ISA G3) | Similar size; weight ~0.40 kg |
| ALF111 (no suffix) | Generic variants used in Node / FIO units; may lack some options like switchable terminators | Slightly lighter if fewer components |
| ALF112 (if exists) | Next generation Fieldbus comm module with more port options or higher redundancy | Possibly larger or heavier |
Other Popular Yokogawa Modules
| Model | Function / Use‑Case | Approx. Dimensions & Weight |
|---|---|---|
| ADV551‑P63 | Digital Output Module, 32 channels, status / pulse output etc. | ~0.20 kg; smaller depth/height compared to ALF111 |
| ALF121 | Analog Fieldbus Comm Module (if exists) or variant for analog bus networks | Weight ~0.40 kg; similar footprint for communication modules |
| ADV151‑P50 | Digital Input module, used in many control nodes | ~0.30 kg; less depth required |
| AAI143‑S50 | Analog Input modules for measurement signals | 0.40‑0.50 kg; larger in width if multiple channels |
| ADR541‑P50 | Discrete / Relay Output modules for switching heavy loads | ~0.35‑0.45 kg |
FAQ (10 Questions & Answers)
Q1: What is the transmission speed of ALF111‑50?
A1: It operates at 31.25 kbps, consistent with FOUNDATION Fieldbus H1 standard.
Q2: How many fieldbus devices can one segment support with ALF111‑50?
A2: Up to 32 devices per segment (including the ALF111 module itself).
Q3: What is the maximum number of control I/O points per segment?
A3: Up to 48 control I/O points per segment.
Q4: What are the isolation / withstanding voltage ratings?
A4: Approximately 1500 V AC for 1 minute between field and system, and between channel to channel.
Q5: What is the module’s weight?
A5: About 0.40 kg.
Q6: What are the size dimensions of ALF111‑50?
A6: ~ 26.0 cm × 18.0 cm × 6.0 cm.
Q7: What is the operating temperature range?
A7: From −20 °C to +70 °C.
Q8: What redundancy options are available?
A8: Dual redundancy is supported in many configurations (i.e. two ALF111‑50 modules for failover).
Q9: What kind of terminals / bus connections are used?
A9: Pressure‑clamp terminals; removable terminal block with built‑in terminators; switchable terminators on some ports.
Q10: What devices / node units is ALF111‑50 compatible with?
A10: Compatible with Yokogawa node / field I/O units such as ANB10, ANR10, AFF50, AFV10 (including “S” or “D” variants).
Authenticity guarantee
All product specifications are original and authentic imported products. We have an annual sales volume of 300 million yuan, and we only produce original and authentic products. All customers who cooperate with us directly online can enjoy low discounts.
Free warehouse
We have a complete range of product models, 80% of conventional models are in stock, and we have established channels in Asia, Africa, North America, South America, and Europe, effectively shortening the order processing time and satisfying customers in a timely manner.
Technical Team
Fast delivery. Spot goods can be shipped on the same day, and the delivery time transaction is 20% faster than that of peers on average, with a delivery time accuracy rate of 99%.
Thoughtful after-sales service
24-hour after-sales service guarantee team, professional and standardized management service system.