Product Overview

The Yokogawa NFAI141-S00 S2 (NFAI141-S00 S2) is a high-density, 16-channel analog input module engineered for the STARDOM FCN autonomous controller platform. It is widely specified in oil and gas extraction fields, chemical batching plants, and water treatment facilities, where real-time tracking of process variables like pressure, temperature, and flow is essential. The module interfaces with 4 to 20 mA DC normalized signals from both 2-wire and 4-wire transmitters, and features integrated HART communication capabilities. By delivering a fast 10 ms data refresh cycle and onboard overcurrent protection, this module ensures accurate, low-latency measurements. Its ultra-reliable signal acquisition prevents unexpected process trips and safeguards processing loops, dramatically minimizing unscheduled plant downtime.

Suffix Breakdown

The system ordering code for the NFAI141-S00 S2 designates its precise electrical specifications, environmental options, and hardware design generation:

• NFAI141: Base product model for the 16-channel, 4 to 20 mA, Non-Isolated Analog Input Module.

• -S: Standard type module designed for standard industrial process requirements.

• 0: Specifies a hardware build with no explosion protection ratings.

• 0: Basic type functional configuration.

• S2: Style 2 hardware revision, denoting modern components and backward compatibility within standard STARDOM FCN baseplates.

Core Technical Specifications

Technical FAQs

• Q: How does the NFAI141-S00 S2 accommodate both 2-wire and 4-wire transmitters?

  A: The module contains internal physical setting pins for each of the 16 channels. Technicians must configure these jumpers depending on the loop power requirements: 2-wire transmitter mode utilizes the module's onboard 24 V DC power loop, while 4-wire transmitter mode configures the channel to accept externally powered current loops.

• Q: What is the maximum voltage drop across the input terminals during normal operation?

  A: Due to the internal protective circuitry built to prevent current spikes from damaging the system, a voltage drop of up to 3 V DC may occur across the 250 Ohm input resistance at full-scale current.

• Q: Can the NFAI141-S00 S2 be connected directly to a Zener safety barrier for hazardous locations?

  A: No, connecting a Zener barrier directly to this module is not permitted. For intrinsically safe applications in hazardous areas, you must install an active galvanic isolation barrier between this non-isolated module and the field devices.

On-Site Engineering & Installation Guidelines

• Field Power Requirement for 2-Wire Transmitter Loops: When configuring channels for 2-wire transmitter operation, you must supply an external 24 V DC source to the analog field power supply terminal on the rack's power supply module. Without this external 24 V DC field feed, the module cannot distribute loop power to the field transmitters.

• Signal Cable Isolation and Shielding: To eliminate high-frequency electromagnetic noise, route the analog input cables through dedicated instrument trays. Ground the cable shields at a single point inside the control cabinet. Avoid running these low-voltage signal lines parallel to high-voltage AC motor lines or variable frequency drive (VFD) outputs.

• Jumpers and Pin Setting Protection: Always power down the FCN rack before removing the module to adjust individual channel 2-wire or 4-wire setting pins. Modifying the jumpers while the module is live can trigger overcurrent faults or cause momentary process signal disruption on adjacent channels.