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YOKOGAWA F3CX04-ON
Product Overview:
The F3CX04-ON is a 4-channel analog input module for Yokogawa’s F3 (FAST/TOOLS) Series Programmable Logic Controller (PLC). The 04 indicates 4 input channels. The -ON suffix denotes no local LCD display (non-display type). This module accepts 4–20 mA DC and 1–5 V DC input signals and converts them to 12-bit digital values for the PLC processor.
Detailed content
Technical Specifications:
| Parameter | Value |
|---|---|
| Number of Channels | 4 channels (single-ended) |
| Input Signal Type | 4–20 mA DC / 1–5 V DC (selectable per channel) |
| Resolution | 12-bit (4096 steps) |
| Conversion Time | 1 ms per channel (4 channels scanned in 4 ms total) |
| Input Impedance (Current) | 250 Ω (for 4–20 mA input) |
| Input Impedance (Voltage) | 1 MΩ minimum (for 1–5 V input) |
| Isolation | Non-isolated (field-side reference to CPU-side common) |
| Accuracy | ±0.1% of full scale (at 25°C) |
| Temperature Drift | ±0.02% of full scale per °C |
| Power Consumption | 0.9 W (from CPU bus) |
| Operating Temperature | 0°C to +55°C |
| Storage Temperature | -20°C to +70°C |
| Dimensions | 25 mm (W) × 90 mm (H) × 85 mm (D) |
| Weight | Approximately 80 g |
| Mounting | DIN rail (35 mm) or direct CPU backplane mounting |
Functional Features:
- 4 independent input channels with per-channel range selection via software
- Software-configurable input range: 4–20 mA or 1–5 V on each channel
- Linearization function available via F3 function block programming
- Diagnostic LED on module indicates communication status and channel fault
- Hot-swappable when used with F3 CPU backplane (with CPU in RUN mode on supported configurations)
Working Principle:
The module uses a precision resistor network and 12-bit successive approximation ADC to convert analog input signals to digital values. For 4–20 mA input, the signal passes through a 250 Ω shunt resistor, producing a 1–5 V drop that is digitized. For 1–5 V input, the signal is directly fed to the ADC. The converted digital value is transferred to the F3 CPU via the backplane bus during each scan cycle. The CPU applies scaling and engineering unit conversion in the user program.
Advantages:
- Compact form factor — saves rack space in small control panels
- No local display reduces cost while retaining full functionality
- Fast 1 ms conversion time enables high-speed process control loops
- Software configurability eliminates need for hardware jumpers or DIP switches
Applicable Industries:
- Water & Wastewater Treatment — level, flow, and pressure transmitter interfacing
- HVAC & Building Automation — temperature and humidity sensor input
- Food & Beverage — process variable monitoring
- Machine Automation — sensor input for packaging and assembly machines
Installation Requirements:
- Mount on DIN rail (EN 60715, 35 mm Top Hat) or insert into F3 CPU backplane slot
- Ensure proper termination of shielded cables — shield grounded at CPU side only
- Do not mix input signal types on the same channel (current vs. voltage)
- Verify CPU firmware version supports the module before installation
Usage Precautions:
- Do not apply voltage exceeding 30 VDC to any input terminal
- For 4–20 mA inputs, ensure loop power is provided externally (2-wire transmitters) or from CPU (4-wire transmitters)
- Keep input wiring away from high-power cables (>100 mm separation) to prevent EMI
- Check input polarity — reverse polarity on current input may damage the module
