TA40-0N Yokogawa Terminal Block Unit | 40-Point FA-M3 PLC

Yokogawa TA40-0N — 40-Point Terminal Block Unit

The Yokogawa TA40-0N is a 40-point terminal block unit for industrial control wiring. It provides a compact connection interface for compatible Yokogawa PLC I/O configurations, with a rated voltage of 5–24 V DC and an operating voltage range of 4.5–26.4 V DC.

For panel designers and maintenance engineers, the key selection criteria are connector compatibility, conductor size, per-point current, terminal screw requirements, and available mounting space. The TA40-0N supports conductors from 0.08 to 0.26 mm² (AWG 23–28) and has a maximum current rating of 0.5 A DC per point.

Connection Interface at a Glance

Compatible PLC I/O module → TA40-0N terminal interface → Field wiring → External control devices

The TA40-0N is a terminal block unit, not a standalone PLC input or output module. Its function is to provide a field-wiring connection point. Signal processing and I/O functionality depend on the connected module and the wider control system.

01 | Mechanical and Electrical Limits

Parameter	Specification
Manufacturer	Yokogawa
Model	TA40-0N
Product type	Terminal block unit
Number of points	40
Rated voltage	5–24 V DC
Operating voltage range	4.5–26.4 V DC
Maximum current	0.5 A DC per point
Applicable conductor size	0.08–0.26 mm² (AWG 23–28)
Terminal block screw	M2, slotted head
Clamping screw	M2.6, cross head
Color	Black
External dimensions	61.4 × 11.8 × 4.57 mm, with terminal cover
Weight	50 g
Operating temperature	0 to 55°C
Storage temperature	-20 to 75°C
Operating humidity	10–90% RH, non-condensing
Storage humidity	10–90% RH, non-condensing

02 | Compatibility Gate — Check Before Ordering

Connector compatibility must be verified before installing the TA40-0N. According to the supplied product information, this terminal block unit cannot be used with the following Yokogawa modules:

• F3YP04
• F3YP08
• F3YP14
• F3YP18
• F3NC32
• F3NC34

Do not assume that a 40-point interface is compatible with every module that has a similar channel count. Check the exact module model, connector arrangement, pin assignment, and system documentation. If replacing an existing terminal block, compare the original part number and the mating connector before purchase.

03 | Wiring Rules for Panel Builders

• Conductor selection: Use wire within the specified 0.08–0.26 mm² (AWG 23–28) range.
• Current loading: Keep each point within the maximum rating of 0.5 A DC. Do not interpret this as a 0.5 A rating for the entire terminal block.
• Voltage limits: Confirm that the connected circuit operates within 4.5–26.4 V DC and respects the rated operating conditions of the connected I/O hardware.
• Tool selection: Use a suitable slotted tool for the M2 terminal block screw and a cross-head tool for the M2.6 clamping screw.
• Mechanical clearance: Allow for the stated dimensions, terminal access, wire routing, and any additional clearance required by the complete assembly.
• Terminal identification: Label field conductors and verify point assignments against the wiring diagram before energizing the system.

The supplied specification does not state a tightening torque. Do not guess the torque value; obtain it from the applicable Yokogawa documentation. Incorrect tightening can damage small terminals or lead to intermittent connections.

04 | Suitable Equipment and Application Scenarios

When paired with a compatible I/O module, the TA40-0N can be used as part of the field-wiring interface in industrial control panels and automation assemblies.

• PLC control cabinets: Organizing field connections for supported digital I/O configurations.
• Machine control panels: Providing a compact terminal interface for low-voltage DC control circuits within the specified limits.
• Equipment skids: Connecting compatible field wiring in packaged process or utility equipment.
• Production-line control: Supporting structured wiring for discrete signals between the field and a PLC I/O system.
• Maintenance and replacement: Replacing a matching terminal block where the installed module and connector arrangement have been verified.

These are potential use cases, not a guarantee of compatibility with a particular PLC or field device. The connected module determines the actual I/O function, and the full assembly must meet its electrical and mechanical requirements.

05 | Installation and Commissioning Checklist

1. Confirm that the complete model number is TA40-0N.
2. Verify that the mating I/O module is compatible and is not included in the exclusion list above.
3. Compare the connector and pin arrangement with the wiring documentation.
4. Check conductor size, insulation condition, wire preparation, and point-by-point labeling.
5. Confirm that each point's current and the circuit voltage remain within the specified limits.
6. Inspect terminal screws and clamping hardware using the appropriate tools and documented tightening requirements.
7. Before returning the system to service, check wiring continuity and point mapping using the site's approved test procedure.

06 | Field Troubleshooting Matrix

Symptom	Possible cause	Recommended check
One field signal is missing	Loose conductor, incorrect point assignment, damaged wire, or a field-device issue	Compare the terminal label with the wiring diagram and check continuity with power isolated.
Several signals fail at once	Incorrect connector seating, common wiring issue, or a problem in the connected I/O module	Inspect the connector interface and investigate shared circuits before replacing the terminal block.
Intermittent signal behavior	Loose terminal hardware, conductor damage, or vibration-related connection issues	Inspect the wiring and terminal condition. Re-tighten only according to the documented torque requirements.
Terminal or conductor shows heat damage	Excessive current, poor contact, unsuitable conductor, or damaged hardware	De-energize the circuit and investigate the load current, conductor size, and connection quality before reuse.
Replacement unit does not mate correctly	Wrong model, incompatible module, or different connector arrangement	Stop installation and verify the complete part number and manufacturer's compatibility information.
PLC status does not match field wiring	Incorrect point mapping, connected module issue, or a wiring fault	Trace the signal from the field device through the terminal interface to the relevant I/O channel.

Important: The TA40-0N is a connection component. It does not independently diagnose PLC logic or generate I/O status. If a signal problem persists, test the wiring interface first, then investigate the connected I/O module, field device, and PLC program.

07 | Global PLC Spare HUB's Insight

For the TA40-0N, the most important purchasing check is not the 40-point count alone; it is the match between the terminal block and the installed I/O module. The explicit incompatibility list should be checked before ordering, particularly in legacy systems where visually similar connectors may use different assignments.

For maintenance replacements, photograph the original unit, record the mating module's full model number, and label the field wires before removal. This reduces the risk of cross-wiring and shortens recommissioning time. If a terminal shows heat damage or intermittent contact, identify the cause before installing a replacement so that an overloaded or poorly terminated circuit does not damage the new component.

Because the product is rated for up to 0.5 A DC per point, review each circuit's current demand and the connected equipment's requirements. The point rating should not be treated as proof that every connected load is suitable. Confirm the complete circuit design and the limits of the mating module.

08 | Frequently Asked Questions

Q1: Can the TA40-0N be selected based only on the 40-point count?

No. The point count is only one selection factor. Confirm the exact mating module, connector type, pin assignment, voltage, current, and conductor requirements. The supplied documentation specifically excludes several modules from use with this terminal block.

Q2: Does the 0.5 A DC rating apply to all 40 points combined?

The supplied specification states 0.5 A DC per point. It does not establish a total allowable current for the complete assembly. Check the connected module's limits, circuit arrangement, wiring conditions, and manufacturer's guidance before calculating the system load.

Q3: What should I check if a new terminal block fits mechanically but the signals are incorrect?

Do not assume mechanical fit confirms electrical compatibility. Compare the connector pinout and point assignments with the wiring diagram, then verify the connected module model. Incorrect mapping or a different connector assignment can cause signal errors even when the parts appear to mate.

Q4: What information should I send a supplier to reduce the risk of ordering the wrong part?

Provide the full TA40-0N model, the mating I/O module model, a clear photo of the original terminal block and connector, the required quantity, and the destination. For legacy systems, include the relevant cabinet drawing or terminal assignment where available.

Q5: Can a damaged terminal block be reused after tightening the screws?

Not automatically. If the housing, screw threads, clamping parts, or contact surfaces are damaged or heat-discolored, further tightening may not restore a reliable connection. Isolate the circuit, identify the cause, and replace damaged components according to the manufacturer's maintenance requirements.

09 | Ordering, Warranty and Shipping

• Model: TA40-0N
• Product type: Yokogawa 40-point terminal block unit
• Warranty: 12 months, subject to the seller's written warranty terms.
• Shipping methods: FedEx, UPS, and DHL.
• Dispatch target: 24–48 hours after order and payment confirmation, subject to stock availability and order processing.

Request a quote: Send the model number TA40-0N, required quantity, destination, and mating module model to help verify compatibility before ordering.

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