NFAI141-S01

The Yokogawa NFAI141-S01 is a 16-channel analog input module designed to receive 4-20 mA current signals from field instruments. Its non-isolated channel configuration provides analog signal acquisition for a Yokogawa control system. The module is intended for applications requiring multiple current-input signals to be collected through a single I/O module.

Technical Specifications

Parameter	Specification
Model	NFAI141-S01
Brand	Yokogawa
Product Type	Analog Input Module
Product Platform	STARDOM FCN/FCJ
Number of Channels	16
Input Signal	4-20 mA DC
Isolation	Non-isolated
Allowable Input Current	27 mA
Input Resistance (Power ON)	250 ohm
Input Resistance (Power OFF)	500 kohm or more
Input Accuracy	+/-0.1% of full scale
Data Refresh Cycle	10 ms
Input Step Response Time	100 ms
Temperature Drift	Max. +/-0.01%
Transmitter Power Supply	22.8-26.4 VDC
Transmitter Output Current Limit	27 mA
Maximum Current Consumption	310 mA at 5 VDC; 450 mA at 24 VDC
External Connection	Pressure clamp terminal or MIL connector cable
Weight	0.2 kg

Signal Processing and Channel Configuration

The module accepts 4-20 mA current signals from field transmitters and converts them into measurement data for the controller. The 16-channel arrangement allows multiple process variables to be acquired through one module. Its non-isolated design means the input channels do not provide individual galvanic isolation, which should be considered when evaluating field wiring and grounding arrangements.

The specified input accuracy of +/-0.1% of full scale describes the measurement deviation relative to the configured full-scale range. The 10 ms data refresh cycle and 100 ms input step response time describe different aspects of signal performance: controller data updating and the response to a change in the input signal.

Transmitter and Wiring Requirements

The NFAI141 hardware specification supports both 2-wire and 4-wire transmitter configurations. Each channel is configured through its setting pin. When using a 2-wire transmitter, the analog field power supply terminal of the power supply module must receive 24 VDC. The transmitter supply has a specified output current limit of 27 mA.

The module supports pressure clamp terminal connections and MIL connector cable connections. Yokogawa's field connection documentation identifies the NFTA4S terminal block and a 40-pin MIL connector arrangement for the NFAI141 module. The actual connection hardware should be checked against the installed system configuration.

Frequently Asked Questions

Q: Can the NFAI141-S01 accept both 2-wire and 4-wire transmitters?

A: The NFAI141 hardware supports both transmitter types. Each channel requires the corresponding setting-pin configuration, and 2-wire transmitter applications require the specified 24 VDC analog field power supply.

Q: Does this module provide channel-to-channel isolation?

A: No. The NFAI141 is specified as a non-isolated 16-channel analog input module. Applications requiring isolated input channels should not treat this model as equivalent to an isolated analog input module.

Q: What connection options are available?

A: The NFAI141 supports pressure clamp terminal connections and MIL connector cables. The documented terminal block combination is NFTA4S with a 40-pin MIL connection option.

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