NFAI141-S00 S1 Yokogawa STARDOM Datasheet & Technical Manual

NFAI141-S00 S1 Yokogawa 16-Channel Analog Input Module

NFAI141-S00 S1 Yokogawa 16-Channel Analog Input Module

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Yokogawa NFAI141-S00 S1 Analog Input Module Configured for multi-channel analog signal evaluation in Yokogawa STARDOM autonomous controller platforms, the Yokogawa...

SKU: NFAI141-S00 S1

Manufacturer: Yokogawa
Product No.: NFAI141-S00 S1
Product Type: Digital Output Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 600g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Yokogawa NFAI141-S00 S1 Analog Input Module

Configured for multi-channel analog signal evaluation in Yokogawa STARDOM autonomous controller platforms, the Yokogawa NFAI141-S00 S1 (NFAI141-S00 Analog Input Module) provides direct physical/electrical execution. This 16-channel non-isolated module digitizes 4-20 mA DC and 1-5 V DC instrumentation loops, updating controller memory registers over the backplane bus every 10 ms. The unit supplies 22.8 to 26.4 V DC loop power directly to field transmitters while protecting internal electronics via an integrated 27 mA current limiter.

Hardware Specifications

Parameter	Specification
Model	NFAI141-S00 S1
Brand	Yokogawa
Origin	Japan
Input Channels	16 channels, non-isolated
Input Signal Types	4-20 mA DC, 1-5 V DC
Allowable Input Current/Voltage	27 mA DC / +/-7.5 V DC
Input Resistance	250 ohm (Power ON), 500 kohm or more (Power OFF)
Measurement Accuracy	+/-0.1% of full scale
Data Refresh Cycle	10 ms
Input Step Response Time	100 ms
Transmitter Power Supply Output	22.8 V DC to 26.4 V DC (Output current limit: 27 mA)
Temperature Drift	Maximum +/-0.01% per deg C
Power Consumption	310 mA at 5 V DC, 450 mA at 24 V DC
Weight	0.30 kg
Dimensions	Standard STARDOM module form factor
Operating Temp	0 to 55 deg C

4-20 mA HART Loop Protocol & Fieldbus Integration

The NFAI141-S00 S1 integrates 4-20 mA HART loop protocol pass-through capability, allowing the module to overlay digital bi-directional communication onto analog measurement signals. By maintaining an internal input resistance of 250 ohm during powered operation, the circuit preserves signal integrity for digital frequency-shift keying (FSK) HART signals while maintaining a 100 ms step response time for process variables. The non-isolated channel architecture routes 16 process loops into a single high-density node, reducing backplane footprint while providing stable cold junction compensation (CJC) references and signal conversion metrics across process control networks.

Frequently Asked Questions

Q: How does the module input impedance react when backplane power is removed?

A: When system power is ON, the channel input resistance maintains a 250 ohm load to process the current loop. When backplane power is turned OFF, internal switching raises the channel input resistance to 500 kohm or more, preventing current drain on connected transmitter loops during system shutdown.

Q: Can the internal transmitter power supply drive 2-wire field transmitters directly?

A: Yes. The module delivers an integrated auxiliary transmitter power supply ranging from 22.8 to 26.4 V DC per channel. The internal circuit features a hardware current limit set to 27 mA to safeguard the module during field wiring shorts or transmitter fault conditions.

Q: Does the module support hot-swapping during active controller operation?

A: Hot-swapping depends on the field terminal block configuration. When mounted with compatible pressure-clamp or MIL-connector terminal units, field technicians can remove the module without disconnecting field wiring, provided system installation rules for STARDOM backplanes are observed.

Field Installation Guidelines

Terminal Board Wiring: Route all 4-20 mA and 1-5 V DC field cables through pressure-clamp terminals or pre-assembled MIL-connector assemblies. Ensure tight screw torque on terminal clamps to avoid high-resistance signal drift.
Shielding and Grounding: Terminate overall cable shields at a single ground bar near the base of the control cabinet. Keep shield drains floating at the transmitter end to eliminate ground loop currents across the non-isolated channel banks.
Separation of Signal Lines: Maintain a minimum clear distance of 200 mm between 24 V DC signal cables and high-voltage AC power distribution or drive output cables to prevent inductive interference.
Power Supply Integrity: Verify that the incoming 24 V DC field power supply stays strictly within the 22.8 to 26.4 V DC window under full 16-channel load conditions.

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