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Yokogawa ALF111-S01 FOUNDATION Fieldbus Communication Module

Configured for deterministic cyclic data exchange in CENTUM VP and CENTUM CS 3000 distributed control systems, the Yokogawa ALF111-S01 (base model ALF111) provides direct physical-layer interfacing to FOUNDATION Fieldbus H1 segments at 31.25 kbit/s, executing scheduled link-active communication without supervisory intervention.

Hardware Specifications

Parameter	Specification
Model Brand	Yokogawa ALF111-S01
Origin	Japan
Weight	340 g
Dimensions	88 x 58 x 23 mm (W x H x D)
Operating Temp	0 to 50 degC
Power Consumption	4.5 W max (24 VDC ±10%)
Transmission Speed	31.25 kbit/s
Number of H1 Ports	4 segments
Max Devices per Port	32 (practical limit ~12–16)
Max Segment Length	1900 m (Type A cable, no repeaters)

FOUNDATION Fieldbus Protocol Integration

The module supports 4-20 mA HART loop protocol overlay on FOUNDATION Fieldbus segments, enabling simultaneous analog signaling and digital data transfer. Channel-to-channel isolation prevents crosstalk between segments, while cold junction compensation maintains accurate temperature referencing for connected instrumentation. The deterministic schedule ensures bounded message latency under full process load.

Frequently Asked Questions

Q: Does the ALF111-S01 support hot-swapping in an operational node unit?

A: No. Removal or insertion must occur only after powering down the associated node unit to prevent backplane transients.

Q: What is the redundancy behavior during dual-module operation?

A: In redundant configuration, the standby module assumes communication within one scheduled macrocycle following active module failure.

Q: Are firmware updates backward-compatible with older CENTUM CS 3000 revisions?

A: Firmware compatibility depends strictly on the installed system revision; consult the Yokogawa engineering manual before upgrading.

Field Installation Guidelines

Mount the ALF111-S01 in designated ESB/ER bus node unit slots using correct torque on securing screws. Use shielded Type A fieldbus cable with shield drain wires terminated at the host end only. Maintain minimum separation of 30 cm from high-voltage power wiring to reduce electromagnetic interference. Install fieldbus terminators at both ends of each segment and verify termination resistance before energizing the network.

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