ALF111-S00 Yokogawa CENTUM VP Datasheet & Technical Manual

ALF111-S00 Yokogawa CENTUM VP FOUNDATION Fieldbus H1 Module

ALF111-S00 Yokogawa CENTUM VP FOUNDATION Fieldbus H1 Module

Availability: 10 left in stock

Yokogawa ALF111-S00 FOUNDATION Fieldbus Communication Module Configured for high-speed network integration in industrial automation environments, the Yokogawa ALF111-S00, also cataloged...

SKU: ALF111-S00

Manufacturer: Yokogawa
Product No.: ALF111-S00
Product Type: FOUNDATION Fieldbus Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 400g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Yokogawa ALF111-S00 FOUNDATION Fieldbus Communication Module

Configured for high-speed network integration in industrial automation environments, the Yokogawa ALF111-S00, also cataloged as the ALF111 FOUNDATION Fieldbus Communication Module, provides direct physical/electrical execution between field control stations and intelligent field instruments. The hardware acts as a dedicated deterministic link interface, establishing simultaneous connectivity across physical segments without intermediate gateways.

Hardware Specifications

Parameter	Specification
Model	ALF111-S00
Brand	Yokogawa
Origin	Japan
Weight	0.40 kg
Dimensions	12.7 cm x 2.5 cm x 12.7 cm
Operating Temp	0 to 60 deg C
Power Consumption	Max 0.5 A at 5 VDC (from backplane)
Interface Type	FOUNDATION Fieldbus H1 (low-speed voltage mode)
Number of Ports	4 channels (1 independent segment per port)
Transmission Rate	31.25 kbps
Device Capacity	Max 32 units per segment (including module)
Control I/O Channels	Up to 48 points per segment
Electrical Isolation	1500 VAC (field-to-system, channel-to-channel, 1 min)
Termination	Internal, software-switchable fieldbus terminators

Process Control & Distributed Network Topology

The module executes direct digital physical layer management across four independent H1 segments. It enforces the Link Active Scheduler (LAS) function to maintain synchronous, time-critical network control, acting as the centralized clock master for connected transmitters and valve positioners. By operating directly on the system backplane of Field Control Units (AFV30, AFV40, AFF50, A2FV50, A2FV70) or bus node units (ANB10, ANB11, ANR10), it processes cyclic data transfers via the FOUNDATION Fieldbus protocol. Channel-to-channel galvanic isolation prevents ground loop interference from skewing differential voltage modes across adjacent segments, preserving signal integrity under severe electromagnetic variations.

Frequently Asked Questions

Q: Does the module require dedicated external hardware terminators for each connected H1 segment?

A: No. The hardware contains internal, switchable terminators built directly into the circuitry. These can be enabled or disabled via system configuration, removing the need for external resistor-capacitor networks at the module side of the segment.

Q: What are the restrictions regarding hot-swapping the module during active control operations?

A: Online replacement is supported only when the module is deployed in a dual-redundant configuration slot pair. Removing a single, non-redundant module causes immediate termination of the Link Active Scheduler (LAS) on all four segments, leading to a loss of cyclic data communication with the connected field instruments.

Field Installation Guidelines

Bus Segment Wiring: Secure all field cables to the removable pressure clamp terminal block. Ensure that total cable length per segment does not exceed 1900 meters for Type A shielded twisted-pair wire.
Shield Grounding: Connect the fieldbus cable shield to a single, dedicated instrument ground point at the control cabinet side. Terminate the shield cleanly to prevent stray noise injection, and ensure the shield remains completely isolated at the field device end.
Backplane Seating: Power down the node slot if installing a non-redundant unit. Insert the module firmly into the designated slot on the AFV or ANB backplane until the locking mechanisms click, preventing intermittent communication faults caused by physical vibration.

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