F3XD08-6F Yokogawa DC Input Module | 8-Point FA-M3 I/O

F3XD08-6F | Yokogawa 8-Point DC Input Module

The F3XD08-6F is a Yokogawa DC input module designed for discrete signal acquisition.

It accepts 12–24V DC sink or source inputs across eight independent input points.

Photocoupler isolation separates the field input circuit from the module interface.

Selectable input sampling times support applications ranging from normal monitoring to fast event detection.

Engineering Identity

Item	Specification
Brand	Yokogawa
Model	F3XD08-6F
Product Type	DC Input Module
Input Type	DC Voltage, Sink/Source
Number of Inputs	8 Points
Rated Input Voltage	12–24V DC
Operating Voltage Range	10.2–26.4V DC
Isolation	Photocoupler Isolation
Input Current	4.1mA/point at 12V DC; 8.5mA/point at 24V DC
Terminal Connection	10-Point M3.5 Screw Terminal Block
Common Configuration	8 Points/Common
Current Consumption	40mA at 5V DC
Weight	130g

Signal Recognition | The Electrical Thresholds Matter

Signal State	Voltage Requirement	Current Requirement
ON	8.0V DC minimum	2.6mA minimum
OFF	3.4V DC maximum	1.0mA maximum

The operating voltage range extends from 10.2V to 26.4V DC.

Engineers should evaluate actual field voltage rather than relying only on the nominal 24V supply.

This check becomes important when long cables or multiple field devices share the same DC supply.

Input Speed | Five Sampling Choices for Different Events

The F3XD08-6F provides five selectable input sampling settings.

• Always: 0μs sampling setting
• Fast: 62.5μs
• Fast-Medium: 250μs
• Standard: 1ms
• Slow: 16ms

The same five settings apply to both OFF-to-ON and ON-to-OFF response detection.

Interrupt operation can also be specified for each individual input point.

This allows engineers to align input processing with the timing requirements of the machine.

Why Sampling Time Should Match the Field Signal

Application Condition	Practical Approach
Slow machine status	Use a longer sampling interval when rapid response adds little value.
Normal control signal	Use an intermediate setting suitable for the machine sequence.
Fast event detection	Use a shorter sampling interval when signal timing matters.
Interrupt-driven event	Assign an interrupt to the required input point.

Field engineers should avoid selecting the fastest setting automatically.

The sampling choice should reflect the actual signal characteristics and control sequence.

Field Wiring Architecture

The module uses a 10-point M3.5 screw terminal block for external connections.

Eight input points share the specified common arrangement.

The sink/source design provides flexibility when integrating compatible DC field devices.

• Confirm the field device output type before wiring.
• Verify the DC supply polarity before energizing the input circuit.
• Check the common-point arrangement against the machine wiring diagram.
• Keep field wiring organized for easier troubleshooting.
• Verify terminal tightness during scheduled maintenance.

Application Fit | Equipment That Benefits From Eight DC Inputs

Equipment	Typical Signals	Engineering Value
Conveyors	Limit switches and position sensors	Tracks machine movement and interlocks
Packaging Machines	Proximity and status signals	Captures sequence conditions
Material Handling	Travel and safety-related status signals	Supports discrete machine monitoring
Assembly Equipment	Part-present and position inputs	Supports step-by-step control sequences
Process Machinery	Valve and equipment status	Monitors discrete operating conditions
Factory Automation	Switches, sensors, and machine interlocks	Provides eight-channel DC acquisition

Environmental Operating Window

Environmental Item	Operating Condition	Storage Condition
Temperature	0 to 55°C	-20 to 75°C
Humidity	10–90% RH, non-condensing	10–90% RH, non-condensing
Atmosphere	Free from corrosive gases, flammable gases, and heavy dust	Not specified in supplied data

The installation environment should remain clean and free from condensation.

Engineers should also consider cabinet temperature when several modules operate together.

Commissioning Route | Four Checks Before Production

1. Supply check: Confirm the field circuit operates within 10.2–26.4V DC.
2. Signal check: Confirm each device reaches the required ON threshold.
3. Logic check: Verify sink/source wiring matches the control design.
4. Timing check: Select the sampling interval according to signal behavior.

Test each input individually before connecting the complete machine sequence.

This approach makes wiring mistakes easier to identify during commissioning.

Diagnostic Capability | A Signal-First Troubleshooting Method

The module's diagnostic process should begin at the field signal and move toward the controller.

Observed Problem	Recommended Investigation
Input remains OFF	Measure field voltage and confirm the signal exceeds the ON threshold.
Input remains ON	Check residual voltage and confirm the signal falls below the OFF threshold.
Input changes too slowly	Review the selected sampling interval and field signal timing.
Only some points respond	Compare terminal wiring and common connections across affected channels.
Intermittent status changes	Inspect field wiring, supply stability, terminals, and signal quality.
Interrupt event is missing	Verify interrupt assignment and the selected input configuration.

Field example: A proximity sensor may show 24V at the sensor but fail to register reliably at the input.

An engineer should measure voltage directly at the module terminal under operating conditions.

The comparison can reveal wiring loss, common-point errors, or insufficient signal voltage.

Installation and Maintenance Efficiency

• Label every field conductor before terminating the terminal block.
• Record each input's machine function during commissioning.
• Document the selected sampling time for timing-sensitive signals.
• Record interrupt assignments when the application uses event-driven inputs.
• Check terminal connections during scheduled panel maintenance.
• Compare unexpected input states with measured field voltage.

Good signal documentation reduces troubleshooting time when sensors or field wiring require replacement.

Selection Guide | Is F3XD08-6F the Right Input Module?

Choose the F3XD08-6F when the application matches the following requirements.

• Eight DC input points are sufficient.
• The field circuit uses 12–24V DC.
• Sink or source input operation is required.
• Photocoupler isolation suits the signal interface.
• Fast input sampling is useful for the machine sequence.
• Individual input interrupts are required.
• The installation environment remains within the stated temperature and humidity limits.

Do not select this module solely by channel count.

Confirm voltage range, signal thresholds, wiring architecture, timing requirements, and environmental conditions first.

Global PLC Spare HUB Review

The Yokogawa F3XD08-6F offers a practical balance between channel density and signal timing flexibility.

Its eight DC points simplify discrete sensor integration in compact automation systems.

The five sampling choices provide useful control over how the system recognizes changing field signals.

In field applications, this flexibility matters when slow status signals and fast machine events share one I/O platform.

For example, a packaging machine may monitor a guard switch and a fast position sensor simultaneously.

The engineer can assign different input behavior according to each signal's timing requirement.

This approach provides a more controlled commissioning process than applying one timing setting everywhere.

Package, Warranty, and Shipping

• Brand: Yokogawa
• Model: F3XD08-6F
• Product Type: DC Input Module
• Input Configuration: 8-point, 12–24V DC sink/source
• Package: F3XD08-6F module with standard protective packaging.
• Warranty: 12-month warranty under applicable Global PLC Spare HUB sales terms.
• Shipping: FedEx, UPS, or DHL according to destination.
• Dispatch: Target shipment within 24–48 hours after order and stock confirmation.

Request a quotation for F3XD08-6F with your existing I/O configuration and field voltage.

Professional FAQ | Selection and Field Experience

Q1: Why should I measure voltage directly at the module terminal?

The sensor output may differ from the voltage available at the input terminal.

Terminal measurements reveal wiring loss, common-point problems, and supply issues more accurately.

Q2: Can one module handle both sink and source field devices?

The supplied specification identifies the input type as DC voltage with sink/source operation.

Verify the actual wiring arrangement before connecting mixed field-device configurations.

Q3: When would an engineer choose the 16ms sampling setting?

A longer sampling interval can suit slower machine status signals where rapid input recognition is unnecessary.

The correct choice should follow the required machine response time.

Q4: What should I investigate when only one input point behaves incorrectly?

Compare that channel with a known-good point using the same field test signal.

Then inspect terminal wiring, common connections, signal voltage, and input configuration.

Q5: What information should I provide when requesting a replacement?

Provide the complete model number, field voltage, input count, signal type, and existing wiring arrangement.

This information helps engineers confirm whether the selected I/O configuration fits the application.

Tags