ALF111-S01 Yokogawa Foundation Fieldbus Communication Module

Hardware Specifications

FOUNDATION Fieldbus Communication and DCS Integration

The ALF111-S01 manages FOUNDATION Fieldbus H1 communication by executing LAS scheduling functions and transferring process data between field devices and the Yokogawa FIO architecture. Moreover, the module provides four independent fieldbus ports, with each port assigned to a separate fieldbus segment.

The module supports FOUNDATION Fieldbus connectivity for Yokogawa CENTUM system configurations through ESB Bus Node Units and Compact Field Control Units. In addition, it supports redundant installation arrangements when paired within compatible FCS configurations.

For Yokogawa process control applications, the ALF111-S01 follows FOUNDATION Fieldbus connectivity standards, including field device communication through H1 voltage mode signaling. The design also incorporates channel-to-channel isolation characteristics required for process instrumentation interfaces.

The ALF111-S01 supports FOUNDATION Fieldbus device integration packages defined in Yokogawa General Specifications documents, including LFS2610 for Foundation Fieldbus Communication Package configuration.

Frequently Asked Questions

Q: What communication protocol does the Yokogawa ALF111-S01 support?
A: The ALF111-S01 supports FOUNDATION Fieldbus H1 communication using Low Speed Voltage Mode with a transmission speed of 31.25 kbps.

Q: How does the ALF111-S01 operate within a fieldbus network?
A: The module operates as a Link Active Scheduler (LAS) and controls communication scheduling between connected FOUNDATION Fieldbus field devices.

Q: Which Yokogawa units accept the ALF111-S01 installation?
A: The module installs in ANB10S, ANB10D, ANR10S, ANR10D, AFF50S, AFF50D, AFV10S, and AFV10D units.

Field Installation Guidelines

Install the ALF111-S01 in the specified Yokogawa node units or Compact Field Control Units according to the hardware installation manual. Ensure the module seats correctly in the designated mounting slot before applying system power.

Use the approved fieldbus terminal configuration during wiring. Furthermore, maintain proper cable shielding and grounding practices to reduce communication interference on FOUNDATION Fieldbus segments.

Verify the fieldbus power supply arrangement before commissioning. The LAS function requires a compatible MTL5995 fieldbus power supply according to the system configuration.

For redundant FCS installations, install paired modules according to Yokogawa hardware configuration rules. Confirm segment assignment, termination settings, and node addressing before connecting field devices.