Overview
Suffix Breakdown & Model Matrix
The supplied documentation identifies the complete ordering code as AFV10S-S31251. The available suffix definitions are partially documented.
| Suffix | Description |
|---|---|
| AFV10S | Field Control Unit |
| -S | Standard model |
| 3 | 24 VDC power supply |
| 1 | Basic configuration (as documented) |
| 2 | Standard ordering option |
| 5 | Basic type without explosion protection |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AFV10S-S31251 |
| Brand | Yokogawa |
| Origin | Japan |
| Product Type | Field Control Unit (FCU) |
| Processor | VR5432, 133 MHz |
| Main Memory | 32 MB |
| Memory Backup | Battery-backed RAM, maximum 72 hours |
| Battery Recharge Time | Minimum 48 hours |
| Vnet/IP Interface | Dual-redundant |
| Maximum Node Units | 14 per FCU |
| Maximum ESB Bus Nodes | 9 |
| Supported Processor Module | CP451 |
| Supported Power Modules | PW481, PW482, PW484 |
| Maximum I/O Modules | 8 |
| ESB Bus Interface | EC401 Coupler Module |
| ER Bus Interface | EB401 Interface Master Module |
| Status Output | NC and C contacts |
| Contact Rating | 30 VDC, maximum 0.3 A |
| Input Power | 100 – 120 VAC, 50/60 Hz; 220 – 240 VAC, 50/60 Hz; or 24 VDC (model dependent) |
| Power Consumption | 200 VA (100 – 120 VAC), 230 VA (220 – 240 VAC), 5.5 A (24 VDC) |
| Weight | Approximately 7 kg |
| Mounting | 19-inch rack mounting |
| Network Connection | CAT5e or higher UTP cable to Layer 2 switch |
| Power Terminal | M4 screw terminal |
| Ground Terminal | M4 screw terminal |
| Operating Temp | Refer to Yokogawa Vnet/IP System Overview (environmental specifications not listed in supplied data) |
Process Control Signal Architecture
The AFV10S is designed for distributed process control using Yokogawa FIO architecture rather than direct field signal acquisition. Analog signal conditioning, including functions such as channel-to-channel isolation, HART communication support, cold junction compensation, or FOUNDATION Fieldbus connectivity, is implemented by the associated FIO I/O modules rather than by the FCU processor chassis itself. The FCU manages processor execution, network communication, and deterministic data exchange across the Vnet/IP control network while coordinating connected ESB Bus and ER Bus node units.
Frequently Asked Questions
Q: Does the AFV10S support redundant processor operation?
A: Yes. Dual-redundant configurations use two CP451 processor modules together with dual power supply modules.
Q: How are ESB Bus interfaces installed?
A: ESB Bus communication requires EC401 modules. In redundant processor configurations, EC401 modules are installed in both Slot 7 and Slot 8. Single configurations use Slot 7 only.
Q: Can ESB Bus and ER Bus node units be mixed?
A: Yes. The combined total of connected ESB Bus and ER Bus node units cannot exceed 14. The documentation specifies a maximum of 9 ESB Bus node units.
Field Installation Guidelines
- Install the chassis using the specified 19-inch rack hardware and M5 mounting screws.
- Connect protective grounding to the designated M4 grounding terminal before energizing the system.
- Use CAT5e or higher Ethernet cable for Vnet/IP network connections through a Layer 2 switch.
- Verify the installed power supply module matches the specified supply voltage before commissioning.
- Install EC401 or EB401 interface modules only in the designated slots according to the selected ESB Bus or ER Bus architecture.
- Maintain cable separation between power wiring and communication wiring to minimize conducted electrical noise.
- Follow the environmental installation limits specified in the Yokogawa Vnet/IP System Overview for enclosure selection and site conditions.
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