Product Description
Product Overview
The Yokogawa ALF111-S50 S1 Fieldbus Communication Module is a robust interface designed to facilitate communication between Field Control Stations (FCS) and FOUNDATION Fieldbus (H1) compliant devices, such as transmitters and valve positioners, within Yokogawa’s N-IO/FIO systems. Acting as a Link Active Scheduler (LAS), this module supports up to four H1 segments at 31.25 kbps, enabling efficient data exchange in industrial automation environments. With a standard, non-explosion-proof design and ISA Standard G3 option, it mounts on compatible node units (e.g., ANB10◽, AFV30◽), offering dual-redundancy capabilities and a maximum of 48 control I/O channels per segment.
Technical Information
| Parameter | Specifications |
|---|---|
| Manufacturer | Yokogawa |
| Model/Part Number | ALF111-S50 S1 |
| Description | Fieldbus Communication Module |
| Model | ALF111 |
| Interface | FOUNDATION Fieldbus (low speed voltage mode), 4 ports (1 segment per port) |
| Transmission Speed | 31.25 kbps |
| Withstanding Voltage | From field to system: 1500 V AC/minute Between primary and secondary side, between channel and channel: 1500 V AC for 1 minute |
| Bus Connection (External Connection) | Pressure clamp terminals (removable terminal block with built-in terminators, switchable on/off); connects to terminal board via dedicated cable |
| Installation Method | Mounted on ANB10◽, ANB11◽, AFV30◽, AFV40◽, A2FV50◽, or A2FV70◽ |
| No. of Control I/O Channels | Max. 48 points/segment (up to 6 points configurable as high-speed scanning type on ER bus, complies with high- and medium-speed scanning cycles) |
| No. of Fieldbus Devices | Max. 32 units per segment (ALF111 counts as one unit) |
| Communication Functions | LAS function, Clock master function |
| Dual-Redundancy | Enabled for two ALF111 units in annexed slots of the same node unit |
| Current Consumption | 0.5 A or less |
| Weight | Approx. 0.40 kg (0.88 lb) |
| Installation Environment (for VP6F1700 FCS with AFV30◽/AFV40◽) | |
| No. of ALF111 Modules | Max. 64 units/FCS (max. 32 pairs for dual-redundant operation) |
| No. of All Communication Modules | Max. 64 modules/FCS |
| No. of FOUNDATION Fieldbus Faceplate Blocks | Max. 100 blocks/ALF111 Max. 1500 blocks/FCS (general-purpose database type) Max. 1000 blocks/FCS (batch database type) |
Specific Configuration
- Model/Part Number: ALF111-S50 S1
- Configuration Details:
- Suffix Codes: -S (Standard type), 5 (With no explosion protection), 0 (Basic type)
- Option Code: /F9S00 (With pressure clamp terminal block for Fieldbus [Model: ATF9S-00])