The Yokogawa ALF111-S50 serves as a specialized 4-port communication module designed for the FIO hardware series. Specifically, this module facilitates data exchange between the Field Control Station (FCS) and field devices operating in low-speed voltage mode. As the "Standard Type" with no explosion protection, it offers a reliable and cost-effective solution for safe-zone automation architectures. Meanwhile, the integrated LAS function allows the module to manage all communications on the fieldbus segment independently, ensuring deterministic control.
In terms of safety and reliability, the Yokogawa ALF111-S50 provides impressive electrical isolation across all ports. Specifically, the module features a withstanding voltage of 1500 V AC per minute between the field-side wiring and the system-side electronics. Furthermore, the unit includes removable pressure clamp terminals with built-in terminators that engineers can manually switch on or off. This integrated design eliminates the need for external bus terminators, which significantly reduces the complexity and failure points within the wiring cabinet.
Regarding system availability, the Yokogawa ALF111-S50 supports full dual-redundancy when users install two modules in adjacent slots. In this configuration, the secondary unit takes over communications instantly if the primary module encounters a hardware fault. Additionally, each of the four ports can host up to 32 fieldbus devices, including the module itself as one unit. Therefore, a single module can potentially coordinate up to 128 devices across its four segments, providing massive scalability for large-scale industrial plants.
Specifically, the Yokogawa ALF111-S50 is a "Basic Type" module with a net weight of approximately 0.40 kg. Its rugged industrial housing allows it to function stably within the standard temperature ranges of Yokogawa node units. Moreover, the module mounts seamlessly on several baseplate series, including the ANB10, ANB11, and AFV30/40. Because it lacks explosion protection, maintenance teams should ensure its installation remains within non-hazardous or appropriately purged enclosures.
First, verify that the baseplate is a compatible model such as the ANB10 or AFV30 series. Next, insert the Yokogawa ALF111-S50 into the designated slot on the node unit until the backplane connectors fully engage. After that, configure the built-in terminators based on whether the module is at the physical end of the fieldbus segment. Finally, connect the field cables to the pressure clamp terminals and initialize the LAS configuration through the Centum VP system software to begin device discovery.
1 x Yokogawa ALF111-S50 Communication Module
Factory-Sealed Anti-Static Protective Bag
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Q: How many devices can I connect to a single port on the ALF111-S50? Specifically, each of the four segments supports a maximum of 32 units, though the Yokogawa ALF111-S50 itself counts as one unit in that total.
Q: Does this module support redundant configurations? Yes, you can enable dual-redundancy by installing two units of Yokogawa ALF111-S50 in adjacent slots within the same node.
Q: What is the purpose of the built-in terminators? These terminators can be switched on to provide the necessary impedance at the end of a bus segment, which simplifies wiring and improves signal quality.
Q: Can this module operate as a clock master? Absolutely, the module includes a Clock master function to synchronize timing across all devices on the fieldbus segment.
Q: What is the standard transmission speed for this module? The Yokogawa ALF111-S50 operates at a fixed transmission speed of 31.25 kbps, adhering to FOUNDATION Fieldbus H1 standards.
| Brand Name | Yokogawa Electric |
| Model No. | ALF111-S50 |
| Product Type | FOUNDATION Fieldbus Communication Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
