F3XH04-3N Yokogawa FA-M3 Pulse Input Module 24V DC 4-Channel

Yokogawa F3XH04-3N | High-Speed Pulse Input for FA-M3

The Yokogawa F3XH04-3N is a 4-channel high-speed digital input module for the FA-M3 programmable controller platform. It accepts 24 V DC signals and detects short-duration pulses that may be missed during a normal PLC scan.

With a minimum input pulse width of 50 μs, photocoupler isolation, and four independent input circuits, this module supports fast event detection in industrial automation systems. Its pulse-capture and interrupt functions help the controller respond to brief input transitions without relying solely on routine scan-based processing.

Engineering highlight: Pulse-capture and interrupt functions cannot operate simultaneously. Select the required operating mode according to the application, configure the module correctly, and verify the signal timing during commissioning.

01 | Signal Acquisition at a Glance

02 | Electrical Interface and Switching Thresholds

Signal-level check: The stated ON and OFF thresholds define the expected input states. When a field signal falls between the specified OFF and ON limits, do not assume a guaranteed logic state. Check the sensor output, voltage drop, common wiring, and signal waveform.

03 | Timing Logic: From Field Pulse to PLC Processing

The module is designed for applications where short input events require more attention than ordinary scan-based digital input processing can provide.

1. Field event: A photoelectric sensor, proximity switch, or compatible pulse source generates a 24 V DC transition.
2. Electrical detection: The input circuit evaluates the voltage and current against its specified switching thresholds.
3. High-speed capture: The pulse-capture function detects a qualifying transition even when its ON duration is shorter than the normal PLC scan period.
4. Processing support: The detected state is held for 512 μs after an OFF-to-ON transition, according to the module specification.
5. Application response: The PLC program processes the captured input according to the configured system logic.

The F3XH04-3N also supports an interrupt function. This can be useful when the application requires event-driven processing. The pulse-capture and interrupt functions are mutually exclusive, so the required mode must be selected before commissioning.

Timing caution: The 50 μs minimum pulse width is an input detection specification, not a guarantee that the complete PLC application will respond within 50 μs. Program execution, interrupt handling, communication, and output-device response introduce additional timing considerations.

04 | Configuration and Wiring Requirements

The terminal block includes terminals intended for shielded cable connections. Follow the equipment wiring diagrams for shield termination, signal routing, and grounding. Keep high-speed signal wiring away from strong electrical noise sources where practical.

Before energizing: Confirm terminal assignments, field polarity, input voltage, DIP switch positions, and program configuration against the applicable Yokogawa documentation. Do not infer terminal functions from terminal count alone.

05 | FA-M3 Integration and Application Fit

The manufacturer specifies no restriction on the type of CPU module that can be used with the F3XH04-3N. The complete installation must still comply with the selected FA-M3 configuration, system documentation, and application requirements.

• Photoelectric sensing: Captures short pulses from photo-micro switches and compatible photoelectric sensors.
• Proximity detection: Detects brief switching events from compatible 24 V DC proximity sensors.
• Part counting: Supports fast event acquisition on production lines where short sensor pulses may be missed by routine scan-based inputs.
• Position and sequence detection: Monitors short-duration switching events used in indexing, sorting, and machine sequencing.
• Event-driven control: Supports interrupt-based processing where the application benefits from a configured response to an input event.
• Industrial inspection equipment: Acquires rapid sensor transitions for synchronized handling or inspection sequences.

Selection boundary: This is a discrete DC input module, not a general-purpose analog input module or a dedicated high-speed counter specification. If the application requires frequency measurement, pulse accumulation, quadrature decoding, or a defined maximum count rate, verify those capabilities separately before selection.

06 | Operating Environment

Install the module in an environment that meets the specified temperature, humidity, and atmospheric conditions. Assess enclosure ventilation, cabinet contamination, and electrical noise where high-speed signals are involved.

07 | Diagnostic Matrix for Commissioning and Maintenance

Diagnostic method: Start at the field sensor and verify its waveform. Next, confirm voltage and current at the module terminals. Then check the operating mode, PLC configuration, and program behavior. This sequence helps separate field wiring faults from configuration or application-logic problems.

The module’s high-speed input function does not by itself identify the root cause of a machine fault. System diagnostics depend on the PLC program, available status information, the connected sensor, and the overall control architecture.

08 | Global PLC Spare HUB's Insight

When selecting a high-speed input module, engineers should compare the shortest valid field pulse with the input module’s detection requirements and the PLC application's response time. A short input response specification is only one part of the timing chain.

• For high-speed photoelectric sensing: Confirm that the sensor produces a pulse of sufficient width and meets the module’s voltage and current thresholds.
• For production-line counting: Evaluate the minimum interval between events as well as pulse width. Confirm that the program can process events at the required rate.
• For interrupt-driven applications: Review the interrupt configuration, program execution, and potential event frequency before enabling the function.
• For replacement projects: Match the exact model code, terminal arrangement, input voltage, and required operating mode. Check the existing program before replacing a module with a different input type.
• For fault investigation: Use an oscilloscope or suitable measurement instrument to confirm the actual pulse waveform when intermittent events are difficult to reproduce.

The Yokogawa F3XH04-3N is most appropriate when the control system needs reliable detection of short 24 V DC input pulses. Applications that require pulse accumulation or precise frequency measurement should be checked against the specifications of the complete FA-M3 system.

09 | Five Professional FAQs

Q1. How can I determine whether the F3XH04-3N is suitable for my sensor?

Check the sensor’s output type, supply voltage, ON-state voltage and current, OFF-state leakage, and minimum pulse width. The module is designed for 24 V DC inputs, with an operating voltage range of 20.4–26.4 V DC. Confirm that the sensor output meets the module’s switching thresholds under actual load conditions.

Q2. Will the module reliably capture pulses generated at a very high repetition rate?

The 50 μs minimum pulse width describes the specified pulse detection capability, but it does not establish a maximum event frequency for every application. Check the pulse period, OFF time, event spacing, PLC processing load, and required counting behavior. Obtain the applicable manufacturer specifications if the application depends on a guaranteed maximum event rate.

Q3. What should I check before changing from pulse-capture mode to interrupt mode?

Confirm which function the control program requires and review the existing DIP switch settings. The two functions cannot be used simultaneously. Check the per-point interrupt setup in WideField3 and validate the program response after making any configuration changes.

Q4. Is this module a direct replacement for a standard 24 V DC digital input module?

Not necessarily. Although it accepts 24 V DC signals, it includes high-speed pulse-capture and interrupt features that may require specific configuration and program logic. Before replacement, verify the FA-M3 system configuration, terminal wiring, input behavior, and application requirements.

Q5. What details should I provide when requesting a quotation for this module?

Provide the full model number F3XH04-3N, required quantity, destination country, and any timing or application requirements. If replacing an installed unit, include the controller model, existing module model, and a clear nameplate photo where available. These details help verify the requested configuration and reduce selection errors.

10 | Ordering, Warranty and Shipping

• Manufacturer: Yokogawa
• Model: F3XH04-3N
• Series: FA-M3
• Product type: High-Speed Pulse Input Module
• Configuration: 24 V DC, 4 independent input channels
• Warranty: 12 months, subject to the seller’s written warranty terms.
• Shipping options: FedEx, UPS, and DHL, subject to destination and service availability.
• Dispatch target: 24–48 hours after order confirmation, subject to stock availability and payment clearance.

Request a quote for Yokogawa F3XH04-3N. Include your required quantity, destination, and application details. For replacement orders, provide the existing module model and relevant FA-M3 system information to help confirm compatibility before shipment.

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