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Yokogawa AFV10D-S41101
Product Overview:
The AFV10D-S41101 is a Fieldbus (FF) communication interface module from Yokogawa’s AFV10D series. It serves as a protocol gateway between HART smart transmitters and Foundation Fieldbus (FF) H1 or HSE networks. The module enables Yokogawa DCS/PLC systems to communicate with FF field devices through a standardized interface.
Detailed content
Technical Specifications:
| Parameter | Value |
|---|---|
| Communication Protocol (Field Side) | Foundation Fieldbus H1 (31.25 kbps, IEC 61158-2) |
| Communication Protocol (Host Side) | HART 7 / Modbus RTU (configurable) |
| Supported Device Profile | FF H1 Device (AI, PI, DI, DO function blocks) |
| Number of FF Devices | Up to 8 FF H1 devices per module (depending on device complexity) |
| Baud Rate (H1) | 31.25 kbps (fixed for H1) |
| Power Supply (Field Side) | 9-32 V DC (bus-powered from FF segment) |
| Power Supply (Host Side) | 24 V DC (typical) |
| Power Consumption | Approximately 2 W (typical) |
| Isolation | Galvanic isolation between FF bus and host interface: 500 V AC |
| Operating Temperature | -10°C to +60°C |
| Storage Temperature | -20°C to +70°C |
| Mounting | DIN Rail (35mm, EN 50022) |
| Dimensions (W × H × D) | Approximately 75 mm × 100 mm × 105 mm |
| Weight | Approximately 250 g |
| Enclosure Material | Flame-retardant polycarbonate (UL94 V-0) |
| Front Panel Protection | IP20 (indoor use only) |
| Status Indicators | LED indicators: Power (green), FF Communication (green), Fault (red) |
Functional Features:
- FF H1 Master function: Acts as a Link Active Scheduler (LAS) on the FF H1 segment
- HART pass-through: Supports HART communication to Yokogawa smart transmitters (EJA, YTA series) connected via FF
- Protocol conversion: Translates between FF function blocks and HART/Modbus register maps for DCS integration
- Device management: Supports FF device description (DD) files for automatic device recognition
- Online diagnostics: Monitors FF bus health, device status, and communication errors
- Hot-swap capable: Can be replaced on a live FF segment without bus interruption (with proper LAS handover)
Working Principle:
The AFV10D-S41101 contains a dedicated FF H1 communication ASIC (Application Specific Integrated Circuit) that implements the IEC 61158-2 physical layer and data link layer. The module operates as the Link Active Scheduler (LAS), managing token passing on the FF H1 bus. It reads FF function blocks (AI, PI, DI, DO) from field devices, converts the data to HART or Modbus register format, and presents it to the host DCS/PLC via the host-side interface. For HART devices on the FF segment, it passes HART commands transparently using HART over FF encapsulation.
Advantages and Highlights:
- Seamless FF-to-DCS integration without requiring a full FF-capable DCS
- Supports up to 8 FF H1 devices per module, reducing system cost
- HART pass-through maintains compatibility with existing HART smart transmitters
- Galvanic isolation (500 V AC) protects host system from field bus faults
- Compact DIN rail form factor fits standard control panels
- LAS redundancy support — can be configured as backup LAS
Applicable Industries:
- Oil and Gas (refineries, offshore platforms)
- Chemical and Petrochemical
- Power Generation
- Pulp and Paper
- Pharmaceutical
Installation Requirements:
- Mount on DIN 35mm rail inside a control cabinet
- Connect FF H1 bus wiring using shielded twisted-pair cable (Type A, 100Ω characteristic impedance)
- Install 120Ω termination resistor at each end of the FF H1 segment
- Connect 24V DC power supply to the host-side terminals
- Ensure proper grounding of cable shields at one end only (typically at the LAS end)
- Verify LAS address setting — only one LAS per FF H1 segment
Usage Precautions:
- Only one LAS (Link Active Scheduler) per FF H1 segment — do not install multiple AFV10D modules as LAS on the same segment
- Use only Type A shielded twisted-pair cable with 100Ω ± 20% characteristic impedance
- Do not exceed 32 devices (including spurs) on a single FF H1 segment
- Maintain maximum segment length of 1900m (including spurs) for 31.25 kbps operation
- Perform FF device commissioning using Yokogawa FieldMate or AMS Device Manager
- Do not apply more than 32V DC to the FF bus terminals
