Yokogawa F3XC08-0C No-Voltage Input Module

Yokogawa F3XC08-0C 8-Point No-Voltage Contact Input Module

Product Introduction

The F3XC08-0C is a no-voltage contact input module designed by Yokogawa for the FA-M3 and FA-M3V programmable logic controller series. Rather than sensing voltage levels, this unit detects the open or closed state of dry contacts such as pushbuttons, limit switches, and relay outputs. Accordingly, it suits panels where field devices provide isolated contact closures and no external wetting voltage is available. Each of the 8 inputs has its own common terminal, which gives engineers full freedom to mix independent circuits in a single module. Furthermore, per-point interrupt capability lets critical signals trigger immediate program handling instead of waiting for the next scan.

Technical Specifications

The F3XC08-0C provides 8 input points for no-voltage contact signals. Contact ratings are 5 V DC minimum and 20 mA maximum, keeping the wetting current gentle on small switch contacts. For a valid ON state, ON resistance must be 200 Ω maximum. Meanwhile, OFF resistance needs to be 100 kΩ minimum, so leakage paths through damp wiring do not create false inputs. These thresholds make the module forgiving with long cable runs in noisy plants.

Isolation between the field side and internal logic relies on transformer isolation, a robust method that blocks common-mode noise and ground potential differences. Every point carries a separate common, and the module allows 100% of inputs turned on simultaneously without derating. Input response time offers five selectable sampling steps: Always (0 μs), 62.5 μs, 250 μs, 1 ms, and 16 ms. Specifically, the total response equals the sampling period plus 1 ms maximum. Interrupts can be assigned to each input point, enabling fast event capture for alarms and safety interlocks. Additionally, the module draws 75 mA from the backplane.

Mechanical and Environmental Parameters

Field wiring connects through an 18-point terminal block with M3.5 screws, a familiar format for maintenance technicians and panel builders. The F3XC08-0C weighs approximately 170 g and fits a single slot in the FA-M3 base unit. Screw terminals also allow ring lugs, which improve vibration resistance on machinery.

For environmental limits, the module operates from 0 to 55 °C and stores between -20 °C and 75 °C. Humidity stays within 10 to 90% RH for both operating and storage conditions, with no condensation allowed. Moreover, the surrounding atmosphere must be free of corrosive gases, flammable gases, and heavy dust. These ratings fit machine control cabinets, process rooms, and general factory environments.

Installation Guide

Careful wiring preserves the noise rejection that transformer isolation provides. First, power down the FA-M3 base and confirm the target slot is free. Next, seat the F3XC08-0C on the base guide rails and press until the backplane connector locks. After that, tighten the mounting screws. For field connections, strip wires to the correct length and land them on the M3.5 screws with proper torque. Because each point has a separate common, label every pair clearly at both ends. Keep contact cables apart from drive and motor power lines, then set the sampling time and interrupt assignments in the PLC configuration. Finally, apply power and confirm each input toggles in the monitor.

Packaging List

• 1x Yokogawa F3XC08-0C No-Voltage Contact Input Module

• 1x Anti-static protective bag

• 1x Carton box with shock-absorbing foam

FAQ

1. What kind of field devices does the F3XC08-0C accept?
It reads dry contact closures such as pushbuttons, limit switches, float switches, and relay contacts. The module supplies its own sensing current, so no external wetting voltage is needed.

2. Why does transformer isolation matter for contact inputs?
Transformer isolation blocks ground loops and common-mode noise between field wiring and PLC logic. This protection improves reliability on long cable runs in electrically noisy plants.

3. Can I use all 8 inputs at the same time?
Yes, the maximum simultaneous ON ratio is 100%, so there is no derating. Every point can stay closed indefinitely without thermal concern.

4. What does "separate commons" mean in practice?
Each input has its own common terminal instead of sharing one line with other points. As a result, you can connect contacts from unrelated circuits to the same module without interference.

5. What shipping methods do you use for international orders?
We ship worldwide through Fedex, UPS, and DHL. Tracking information goes out at dispatch so you can follow the shipment to your site.