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Yokogawa AFV30D-A41252 Field Control Unit

The Yokogawa AFV30D-A41252, also cataloged as the AFV30D Duplexed Field Control Unit, operates as a dedicated hardware component for executing distributed process control over dual-redundant Vnet/IP networks within CENTUM VP systems. It provides deterministic signal processing and direct interface to Field Input/Output modules through a rack-mounted architecture.

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa AFV30D-A41252
Origin	Japan
Weight	8.0 kg
Dimensions	482.6 mm W × 221.3 mm H × 265.9 mm D
OperatingTemp	-10 degC to +55 degC
PowerConsumption	230 VA
Processor Module	CP471, hot-swappable dual-redundant
Minimum System Version	CENTUM VP R6.01
Network Interface	Dual-redundant Vnet/IP, 1 Gbps full duplex, RJ45
Max Node Capacity	14 nodes per FCU
Power Supply	Dual-redundant 220-240 V AC, 50/60 Hz
READY Contact Output	2 terminals (NC, C); 30 V DC, 0.3 A max
Mounting	19-inch rack, 8 × M5 screws
Memory Backup	Battery-backed, 72 h max

Channel-to-Channel Isolation

The AFV30D-A41252 architecture enforces electrical and data isolation between individual process channels to minimize signal interference. Each CPU pair maintains independent grounding paths, and the communication buffers on the Vnet/IP ports provide deterministic timing to prevent cross-channel data corruption. Cold junction compensation (CJc) routines are embedded in the processor firmware to maintain thermal stability across sensor inputs.

Frequently Asked Questions

Q: Can the AFV30D-A41252 CPU modules be replaced while the system is operating?
A: Yes, the CP471 processor modules are hot-swappable. The backup module maintains process integrity during replacement.

Q: What is the maximum cable distance for Vnet/IP connections?
A: Directly connected nodes support up to 100 meters using CAT5e or higher UTP cables.

Q: Are the READY contact outputs affected by power redundancy loss?
A: The contacts open if any FCU failure occurs, including power module failure, ensuring external monitoring receives a clear fault signal.

Field Installation Guidelines

1. Mount the unit on a standard 19-inch rack using 8 × M5 screws. Ensure adequate airflow around the module for cooling.
2. Connect dual-redundant power supplies to separate AC circuits when possible to preserve redundancy.
3. Shielded twisted pair or CAT5e/6 cables must be used for Vnet/IP connections; separate signal and power lines to avoid electromagnetic interference.
4. Ground the chassis according to local electrical codes. Avoid using shared ground with high-current devices to minimize noise.
5. When connecting FIO nodes, follow the ESB bus topology limits and observe the maximum node capacity per FCU.

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