Description

Yokogawa NFTA4S-10 Pressure Clamp Terminal Block

Configured for connecting 4-20 mA loop signals from field transmitters in Yokogawa STARDOM Distributed Control System networks, the Yokogawa NFTA4S-10 (NFTA4S-10 Pressure Clamp Terminal Block) provides direct physical/electrical execution.

The unit operates as a 16-channel non-isolated termination interface for analog signal aggregation into FCN-based controller I/O modules. Channel conductors share a common reference potential, and signal integrity is dependent on loop grounding topology and external wiring discipline. Mechanical retention is achieved via pressure clamp terminals intended for vibration-prone cabinet environments.

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa NFTA4S-10
Origin	Japan
Weight	Approx. 0.2 kg (net), approx. 1.0 kg (shipping)
OperatingTemp	-40 degC to +70 degC
PowerConsumption	Passive device (no active power consumption)
Channels	16 analog channels
Signal Types	4-20 mA DC, 1-5 V DC
Isolation	Non-isolated, common ground architecture
Input Resistance	250 ohm (power ON), >=500 kohm (power OFF)
Wiring Range	0.2 to 2.5 mm2
Compliance	IEC61010-1, UL, CSA

Yokogawa STARDOM Interface Electrical Behavior

The NFTA4S-10 is designed for integration with Yokogawa analog I/O infrastructure under the STARDOM Distributed Control System architecture.

The non-isolated channel structure results in all 16 measurement paths referencing a shared electrical ground. In 4-20 mA loop operation, loop compliance voltage and return path impedance directly influence measurement stability. In multi-channel installations, external field wiring layout determines susceptibility to ground potential differences and induced noise coupling between adjacent channels.

Signal conditioning is performed at the paired controller module level rather than at the terminal block, meaning the NFTA4S-10 functions strictly as a passive termination and distribution interface without galvanic separation or onboard filtering.

Frequently Asked Questions

Q: Can the NFTA4S-10 support hot-swap operation under live 4-20 mA loops?
A: The terminal block itself has no active circuitry. However, inserting or removing field wiring under energized loop conditions can interrupt current continuity and should be evaluated against loop power design margins.

Q: Does the non-isolated architecture allow channel-to-channel interference?
A: Yes. All channels share a common ground reference. Crosstalk risk is dependent on wiring separation, shielding termination, and external loop impedance rather than internal isolation.

Q: Is the input resistance stable across power states?
A: The design specifies approximately 250 ohm during energized module operation and high impedance (>=500 kohm) when de-energized, affecting loop diagnostic behavior during shutdown conditions.

Field Installation Guidelines

Maintain segregated routing between analog signal cables and high-voltage conductors to reduce inductive coupling. Shield drains should be terminated at a single cabinet reference point to avoid ground loop formation. DIN rail mounting must ensure full mechanical engagement of the terminal block to prevent micro-disconnection under vibration. Torque-free pressure clamp insertion requires fully stripped conductors within rated cross-sectional limits (0.2 to 2.5 mm2). Verify loop polarity before energization to prevent reverse current conditions in 4-20 mA circuits.

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems