Product Details
The YOKOGAWA ALF111-S50, also cataloged as the ALF111 FOUNDATION Fieldbus Communication Module, operates as a dedicated hardware component for digital fieldbus device communication and bus segment management within YOKOGAWA CENTUM VP control systems.
Suffix Breakdown & Model Matrix
The catalog designation for the ALF111-S50 defines specific module features:
- Base Model (ALF111): FOUNDATION Fieldbus Communication Module
- Type (-S): Standard type
- Explosion Protection (5): With no explosion protection
- Option Code (0): Basic type
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ALF111-S50 |
| Brand | YOKOGAWA |
| Origin | Japan |
| Operating Temp | -20 to 60 deg C |
| Interface Protocol | FOUNDATION Fieldbus H1 (31.25 kbps) |
| Number of Channels | 4 fieldbus H1 segments |
| System Bus Interface | CENTUM VP node backplane |
| Explosion Protection | None (Standard Non-Ex) |
FOUNDATION Fieldbus Connectivity and Channel Isolation
The ALF111-S50 interfaces up to 4 independent FOUNDATION Fieldbus H1 segments, executing deterministic cyclic publisher/subscriber data exchanges with field transmitters and valve positioners at a fixed transmission rate of 31.25 kbps. The module provides galvanic isolation between fieldbus segments and internal backplane logic to prevent ground loop currents and cross-channel noise propagation. Operating alongside 4-20 mA HART loop protocol architectures, the ALF111-S50 facilitates direct access to digital device diagnostics and process variables without disturbing control loop integrity.
Frequently Asked Questions
Q: How many FOUNDATION Fieldbus H1 segments can be connected to a single ALF111-S50 module?
A: A single ALF111-S50 module supports up to 4 independent FOUNDATION Fieldbus H1 segments operating at 31.25 kbps.
Q: Does the ALF111-S50 provide fieldbus power to connected H1 field devices?
A: No, the ALF111-S50 acts as a communications interface card; external fieldbus power conditioners and power supplies must be installed on each H1 segment to energize field instruments.
Q: Does the ALF111-S50 support redundant module configuration in CENTUM VP nodes?
A: Yes, dual ALF111-S50 modules can be installed in adjacent paired slots for redundant H1 bus communication, enabling automatic switchover without interrupting segment data traffic.
Field Installation Guidelines
Power down the target rack slot before inserting or removing the module. Wear a grounded ESD wrist strap during handling to protect electronic components. Align the ALF111-S50 with the module guide rails and press firmly into the backplane connector until fully seated, securing top and bottom retaining screws to ensure electrical frame ground continuity. Ensure fieldbus cable wiring complies with Type A FOUNDATION Fieldbus shielded twisted-pair specifications, and verify that external 100-ohm bus terminators are installed at both physical ends of each H1 segment. Connect cable shielding to ground at a single point to prevent ground loop currents.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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