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Yokogawa AFV30D-A41251 Duplexed Field Control Unit

The Yokogawa AFV30D-A41251, also cataloged as the AFV30D Duplexed Field Control Unit, operates as a dedicated hardware component for deterministic regulatory and sequencing execution within CENTUM VP distributed control platforms.

Suffix Breakdown & Model Matrix

Code Segment	Definition
AFV30D	Duplexed Field Control Unit, Vnet/IP, FIO compatible, 19-inch rack mount
-A	Standard type optimized for CP471 processor modules
4	Dual-redundant Vnet/IP interfaces and dual-redundant power supplies
1	Internal designation (fixed value)
2	220–240 V AC power supply voltage
5	Basic type, no explosion protection
1	LFS1700 control function software license for CP471

Hardware Specifications

Parameter	Specification
Model Brand	Yokogawa AFV30D-A41251
Origin	Japan
Weight	8.0 kg
Dimensions	482.6 x 310 x 177 mm (W x D x H)
Operating Temp	0 to 50 degC
Storage Temp	-40 to 85 degC
Power Consumption	Max 160 W
Processor Module	CP471, dual-redundant
Network Interface	Vnet/IP, 1 Gbps, dual-redundant
Main Memory	128 MB
Memory Backup Duration	Up to 72 hours on full battery charge
Node Unit Capacity	Up to 13 FIO expansion nodes
Ready Contact Output	2 terminals (NC, C)

FOUNDATION Fieldbus & 4-20 mA HART Loop Protocol

The AFV30D-A41251 integrates FOUNDATION Fieldbus H1 segments through connected FIO nodes, enabling scheduled execution of function blocks without impacting cyclic scan times. HART protocol operates concurrently with 4-20 mA analog signaling, permitting device parameter access and diagnostics without interrupting control loops. Channel-to-channel isolation reduces ground potential differences when interfacing multiple field devices.

Frequently Asked Questions

Q: Is hot swapping supported for processor modules?

A: Yes, processor modules can be replaced while the unit is operational without disrupting control execution.

Q: How many FIO nodes can connect to a single AFV30D-A41251?

A: The unit supports connection of up to 13 FIO expansion node units via ESB bus.

Q: Does the unit require recalibration after CPU replacement?

A: No. All control logic and configuration reside in non-volatile storage and synchronize automatically between CPUs.

Field Installation Guidelines

Install the FCU into a grounded 19-inch rack ensuring unobstructed airflow around ventilation openings. Separate power and signal cabling into distinct pathways to minimize electromagnetic coupling. Ground cable shields at the rack entry point only. Verify input voltage matches the 220–240 V AC specification before applying power. Confirm all Vnet/IP connectors are fully engaged and latched prior to system energization.

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