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Yokogawa F3NC95-1N
Product Series: F3 I/O Series — CENTUM VP / CENTUM CS 3000 DCS
Product Overview:
The F3NC95-1N is a single-channel communication interface module for the Yokogawa F3 I/O series. It provides RS-485 serial communication capability, enabling the CENTUM VP/CS 3000 DCS to interface with third-party devices using Modbus RTU and other serial protocols. The 1N suffix indicates a non-redundant single-channel configuration.
Detailed content
Technical Specifications:
| Parameter | Specification |
|---|---|
| Communication Protocol | Modbus RTU (Master/Slave), Yokogawa proprietary protocol |
| Physical Interface | RS-485 (2-wire, half-duplex) |
| Baud Rate | 1200, 2400, 4800, 9600, 19200, 38400 bps (configurable) |
| Data Format | 8 data bits, 1 stop bit, No parity / Even / Odd (configurable) |
| Max Cable Length | 1200 m (at 9600 bps, using shielded twisted pair) |
| Isolation Voltage | 1500 VAC (communication port to backplane) |
| Number of Channels | 1 channel (1N) |
| Operating Temperature | 0°C to +55°C (+32°F to +131°F) |
| Power Supply | 5VDC (bus-powered from backplane) |
| Power Consumption | < 1.5 W |
| Dimensions (W×H×D) | 25 × 160 × 120 mm (approx.) |
| Weight | Approximately 0.2 kg |
Functional Features:
- Master and Slave mode operation selectable via configuration
- Up to 32 Modbus devices addressable per channel
- Online diagnostic monitoring: Communication status, error count, timeout alarm
- Buffer memory: 256 bytes transmit / 256 bytes receive
- Galvanic isolation between communication port and DCS backplane
- Auto-retry on communication failure with configurable retry count
Applicable Industries:
- Water Treatment — PLC-to-DCS data exchange for SCADA integration
- Manufacturing — Machine-level data collection from third-party equipment
- Power Plants — Relay and meter data acquisition via Modbus
- Building Automation — HVAC subsystem integration
- Oil & Gas — Remote terminal unit (RTU) communication
Installation Requirements:
- Install in F3 series I/O station within CENTUM VP/CS 3000 rack
- Use shielded twisted-pair cable (120 Ω characteristic impedance)
- Terminate RS-485 bus with 120 Ω resistor at both ends of the bus
- Daisy-chain topology only — no star or tree topology permitted
- Ground reference wire must be connected at one point only
Usage Precautions:
- Maximum 32 devices per RS-485 segment without repeater
- Do not exceed 1200 m cable length at lower baud rates
- Always install 120 Ω termination resistors at both bus ends
- Ensure all devices share common ground reference to prevent communication errors
- Disable unused protocol features to reduce processing load
