F3XA08-1N Yokogawa Electric 8-Channel AC Digital Input Module | FA-M3

F3XA08-1N | AC Signal Acquisition for FA-M3 Controllers

The Yokogawa F3XA08-1N is an eight-point AC digital input module for compatible Yokogawa FA-M3 programmable controller systems. It receives 100–120 V AC field signals and converts their states into input information for controller logic.

Photocoupler isolation separates the input signal interface from the module's internal logic circuitry. Selectable input response times help engineers balance signal recognition speed and input stability.

The module supports applications that monitor AC-powered auxiliary contacts, relay outputs, and compatible field switching devices. Its screw-terminal connection provides a practical interface for control panel wiring and maintenance.

• Manufacturer: Yokogawa Electric Corporation
• Model: F3XA08-1N
• Product series: FA-M3
• Module category: AC digital input module
• Input capacity: 8 points
• Rated input voltage: 100–120 V AC, 50/60 Hz
• Isolation method: Photocoupler isolation
• Connection type: 10-point M3.5 screw terminal block

Technical Data | Electrical Input Characteristics

Signal Interpretation | ON, OFF and Response Timing

Correct input interpretation depends on the field voltage, input current, and selected response-time setting. Engineers should evaluate all three when integrating the module with relay contacts or AC-powered devices.

Engineering note: The specified thresholds define electrical input conditions, not a safety-rated switching function. Use approved safety hardware for safety-critical interlocks.

Configuration and Wiring Considerations

• Input grouping: The module specifies eight points per common group. Confirm the terminal diagram before wiring multiple field circuits.
• Terminal connections: Use the designated M3.5 screw terminals and the manufacturer's recommended tightening procedure.
• AC signal source: Verify that each field device matches the 100–120 V AC input requirements.
• Isolation: Photocoupler isolation supports electrical separation between field signals and internal logic circuitry.
• Interrupt configuration: Check CPU and program support before assigning interrupt-sensitive signals.
• Input response: Select the documented timing option according to signal characteristics and control-cycle requirements.

Safety precaution: Isolate field power before handling terminals. Follow the applicable electrical safety procedures because these inputs operate at hazardous AC voltage levels.

Environmental Operating Limits

Install the module inside a suitable control cabinet. Provide adequate ventilation and protect terminal connections from contamination and condensation.

Suitable Equipment and Industrial Applications

• Industrial control panels: Acquire AC status signals from compatible field devices.
• Motor control centers: Monitor auxiliary contacts from suitable starters and contactors.
• Conveyor systems: Read AC switching signals used for sequence coordination and equipment status.
• Pump stations: Monitor compatible relay outputs and auxiliary operating indications.
• Packaging machinery: Collect machine-state signals for PLC sequence logic.
• Process automation: Acquire discrete AC status signals from compatible field interfaces.
• Equipment retrofits: Replace a matching input module after verifying terminal assignments and controller compatibility.

Field Diagnostics | Practical Fault Isolation

Field example: An AC contactor auxiliary signal may remain logically ON after the contact opens. Measure the OFF-state voltage and check for leakage before replacing the input module.

Diagnostic boundary: The module reports input states to the controller. Fault localization depends on PLC diagnostics, field measurements, wiring checks, and the application's control logic.

Global PLC Spare HUB's Insight

When commissioning AC input circuits, engineers should verify the actual voltage at the module terminals rather than relying only on the source device's nominal rating. Cable losses, leakage paths, and contact conditions can affect signal recognition.

Practical recommendation: For signals that change close to the input thresholds, inspect the source device and wiring before changing the response-time setting. A longer response time may reduce unwanted transitions, but it can also delay sequence recognition.

Replacement insight: Match the complete model number, input voltage class, terminal arrangement, common grouping, and CPU compatibility. An eight-point module with a different input type may not be a suitable replacement.

Five Professional FAQs

Q1: Can this module accept 24 V DC signals from modern proximity sensors?

No. This model specifies 100–120 V AC inputs. Use a compatible DC input module or an approved interface relay when connecting 24 V DC devices.

Q2: What should engineers do when the field voltage falls between the ON and OFF thresholds?

Do not assume a stable logical state in this region. Check the source voltage, leakage current, wiring, and field device condition against the manufacturer's input specifications.

Q3: How should I choose between the available response-time settings?

Use the faster setting only when the signal and application require it and the manual permits it. Longer response times may help with unstable transitions but can delay signal recognition.

Q4: Does the photocoupler isolation make the module suitable for safety interlocks?

No safety rating is established by the supplied specifications. Use certified safety components and an approved safety architecture for emergency stops and personnel-protection functions.

Q5: What information helps confirm a replacement module before purchase?

Provide the complete catalog number, controller model, field voltage, terminal wiring details, required input response, and application environment. These details help identify electrical and system compatibility issues before installation.

Packaging, Warranty and Shipping

• Product: One Yokogawa F3XA08-1N AC digital input module, subject to the confirmed order configuration.
• Accessories: Terminal accessories, cables, and other hardware require separate confirmation unless explicitly included in the quotation.
• Warranty: 12-month seller warranty under the agreed terms.
• Dispatch target: 24–48 hours after order confirmation, subject to stock availability and payment processing.
• Shipping options: FedEx, UPS, and DHL, subject to destination and service availability.
• Before ordering: Confirm the model, input voltage, quantity, destination, and delivery schedule.

Request a Quote | Global PLC Spare HUB

Contact Global PLC Spare HUB for pricing, availability, and delivery options for the Yokogawa F3XA08-1N FA-M3 AC input module.

Share your controller model and field signal requirements to help confirm compatibility. Our team can review the requested configuration before order placement.

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