Technical Description
The ALF111-S00 S1 is a high-performance Fieldbus communication interface module designed for integration with Yokogawa CENTUM VP control systems. It enables seamless communication with Foundation Fieldbus H1 (FF-H1) compliant field instruments, supporting efficient bidirectional data exchange between the control system and smart devices.
The module can manage up to four independent FF-H1 segments, allowing the system to collect primary process variables as well as advanced diagnostic information from devices such as smart transmitters and valve positioners. By handling Fieldbus protocol processing independently, the ALF111-S00 S1 reduces the workload on the main controller and ensures deterministic and reliable communication within the plant network.
The S1 revision represents a refined hardware version featuring optimized circuitry for lower power consumption and improved signal stability within the FIO (Field Interface Option) backplane architecture.
Technical Specifications
| Parameter | Specification |
|---|---|
| Communication Protocol | Foundation Fieldbus H1 (IEC 61158-2) |
| Segment Capacity | 4 independent FF-H1 segments |
| Bus Speed | 31.25 kbps per segment |
| Maximum Devices per Segment | Up to 16 devices (depending on power and segment length) |
| Connection Interface | Dedicated Fieldbus connector (terminal board dependent) |
| Isolation | 1500 V AC between segments and system bus |
| Power Consumption | 500 mA @ 5 V DC (internal system bus) |
| Operating Temperature | -20°C to +70°C |
| Mounting | Compatible with FIO node backplane |
| Dimensions | 127 mm × 127 mm × 25 mm |
| Weight | 0.3 kg |
Operational Application
The ALF111-S00 S1 plays a key role in modern digital process automation systems, particularly in chemical plants, refineries, and oil & gas facilities where advanced device diagnostics and predictive maintenance are essential.
Through Foundation Fieldbus integration, engineers can remotely access instrument health information, calibration status, and communication diagnostics, reducing the need for manual field inspections. The module’s design also allows plants to modernize legacy analog loops, gradually transitioning to digital Fieldbus networks while maintaining compatibility with existing CENTUM VP control infrastructure.
Frequently Asked Questions
Can I mix different brands of Fieldbus devices on the same segment?
Yes. Foundation Fieldbus is an open and interoperable protocol, so the ALF111-S00 S1 supports any FF-registered device, enabling vendor-neutral integration.
What does the S1 suffix represent?
The S1 designation indicates an updated hardware revision of the ALF111 series, featuring improved component reliability and enhanced firmware compatibility with modern CENTUM VP software versions.
Does the module provide power to Fieldbus devices?
No. The ALF111-S00 S1 manages communication only. Field devices must receive power from a dedicated Fieldbus Power Supply (FPS) along with appropriate segment conditioning components, as the module does not supply power to the H1 loop.
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| Warranty | 12 Months |
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