Description
The Yokogawa AFV30D-S41251 is a duplexed field control unit (FCU) that serves as a primary processing node within the CENTUM VP Distributed Control System (DCS) architecture. Engineered for high-availability process automation, this rack-mountable control unit features dual-redundant processor modules that execute real-time control loops, manage diagnostic databases, and orchestrate communications with distributed I/O nodes via the proprietary Vnet/IP control network.
Commercial Availability & Terms
- Condition: New Original (Factory Sealed Surplus)
- Warranty: 12-Month Comprehensive Industrial Warranty
- Availability: In Stock / Available for Global Shipping
- Standard Lead Time: Ships within 2–3 business days via priority international courier
- Pricing Note: Price is subject to market availability, component lifecycle allocations, and hardware series revisions. Contact our technical sales engineering division for a formal, time-bound quotation.
Part Number & Suffix Code Breakdown
The model designation AFV30D-S41251 specifies the exact hardware configuration, power architecture, module options, and safety compliance parameters built into this specific unit:
- AFV30D: Duplexed Field Control Unit for Vnet/IP (19-inch Rack-Mountable).
- -S: Standard type deployment configuration.
- 4: Dual-redundant 220–240 V AC Power Supply Modules (50/60 Hz).
- 1: Basic system software license/capability package included.
- 2: LXI premium performance hardware acceleration tier.
- 5: Confirmed compliance with standard global explosion-proof/hazardous area regulations (verify exact zone clearances with OEM datasheet markings).
- 1: Standard DIN rail or structural rack-mount chassis footprint variant.
Technical Specifications
| Parameter | Value / Specification |
| Processor Redundancy | Dual-redundant (Duplexed) CPU module configuration with hardware synchronization |
| Control Network Interface | Dual-port Vnet/IP (1 Gbps Ethernet-based proprietary protocol) |
| Input Supply Voltage | 220 V AC to 240 V AC nominal (50/60 Hz frequency delivery) |
| Allowable Voltage Range | 198 V AC to 264 V AC continuous operational envelope |
| Power Consumption | Maximum 200 VA under full computational and communications load |
| I/O Node Extension Bus | Supports ESB Bus or Optical ESB Bus connection for remote node linking |
| Chassis Form Factor | Standard 19-inch rack-mount footprint (requires 5U of vertical rack space) |
| Ambient Temperature | 0 to +50 °C (+32 to +122 °F); 10% to 90% relative humidity (non-condensing) |
| Weight | Approximately 13 kg (28.7 lbs) with dual power supplies and dual CPUs populated |
Field Integration & Architectural Constraints
When deploying or performing a hot-migration using the AFV30D-S41251 control unit, the following technical rules must be followed:
- Vnet/IP Network Segmentation: The unit features two physical Vnet/IP connection ports labeled Bus 1 and Bus 2. These must be routed through independent, isolated layer-2 switches to maintain network path diversity. Do not route both buses through the same physical switch chassis, as a switch backplane failure will cause total communication loss to both the primary and backup processors.
- Synchronized CPU Hot-Swapping: Under normal operations, the dual CPU modules execute in a duplexed “lock-step” mode where memory registers are synchronized in real time. If one CPU module exhibits a system fault LED, it can be hot-swapped while the process runs on the backup unit. However, engineers must ensure the replacement CPU contains the exact same hardware functional revision and baseline firmware image before inserting it into the active chassis.
- Earthing and Noise Isolation: The unit requires an independent, isolated instrument ground wire (Type A grounding, resistance of less than 100 \Omega). Connecting the instrumentation common plane to the high-voltage electrical distribution earth will inject common-mode high-frequency noise into the internal communication buses, leading to intermittent I/O dropouts or diagnostic timeouts.
Frequently Asked Questions
What differentiates the “AFV30D” from the “AFV30S” control units?
The “D” suffix in the base model code denotes a Duplexed system containing dual-redundant processing paths and dual power supplies. The “S” suffix signifies a Single processor configuration. The duplexed architecture protects against sudden processing unit hardware failures by executing a bumpless, sub-millisecond failover to the secondary standby processor card.
Can this unit be configured to use 24 V DC input power?
No, not this specific configuration. The third character in the suffix string (4) indicates this unit is factory-built with dual 220–240 V AC power supply modules. If your cabinet architecture dictates 24 V DC power delivery, you must specify an alternate model configuration containing a suffix code tuned for direct current input.
How do I troubleshoot a “Vnet/IP Communication Link Error” on this unit?
Inspect the Link/Activity LEDs located on the front interface panel of the Vnet/IP modules. A dark LED points to a damaged RJ45/Fiber connector, a failed transceiver, or a disabled port on the upstream network switch. If the LEDs show active link traffic but the CENTUM VP engineering workstation reports a node communication fault, verify that the unit’s physical node dial switches (located behind the security cover) exactly match the software node assignment in the system database builder.
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