Yokogawa AFV30D Duplexed Field Control Unit

Hardware Specifications

Vnet/IP Redundant Field Control Architecture and Signal Handling

The AFV30D series implements dual-redundant Vnet/IP communication channels with channel-to-channel synchronization logic across paired processor modules (CP451) and power supply modules (PW481/PW482/PW484). In CENTUM VP configurations, the FCU operates as a deterministic field data concentrator for ESB Bus and ER Bus node units, supporting up to 14 connected nodes per FCU.

Within Yokogawa DCS architectures, the internal I/O execution path supports structured process signal handling over redundant backplane and network layers. The system design includes channel isolation behavior typical of process control FCUs, ensuring separation between redundant processor domains and field interface modules such as EC401 and EB401.

A key functional characteristic is Vnet/IP dual-redundant communication transport, maintaining synchronized data exchange between FCU and higher-level control stations under continuous scan cycle execution.

Frequently Asked Questions (FAQ)

Q: Can the AFV30D FCU operate with a single processor module configuration?
A: Yes. Single configuration is supported; however, redundancy requires two CP451 modules installed in mirrored slots.

Q: What is the limitation of ESB Bus node expansion per FCU?
A: Maximum 14 node units per FCU, with ESB Bus limited to 9 nodes depending on configuration and license expansion package.

Q: Does Vnet/IP communication continue during power supply redundancy switching?
A: Communication is maintained through dual-redundant Vnet/IP interfaces; transient switching is handled by synchronized FCU logic.

Field Installation Guidelines

The FCU shall be installed in a standard 19-inch industrial rack using M5 mounting hardware and insulation bush accessories. Power wiring shall follow terminal torque specifications for M4 screw terminals, with protective grounding executed at a dedicated earth point.

For ESB Bus configuration, EC401 modules must be installed in slot 7 and slot 8 for redundant operation; single configurations require slot 7 only. ER Bus integration requires EB401 installation in an odd-numbered slot with adjacent slot clearance.

Network cabling shall use CAT5e or higher UTP cable connected to Layer 2 industrial switches supporting Vnet/IP traffic segmentation. Redundant power supplies must be wired independently to maintain failover continuity.