Analog I/O Module Yokogawa NFAI841-S00

Hardware Specifications

Yokogawa Process Signal Interface and Loop Handling

The NFAI841-S00 processes analog field signals through 4-20 mA and 1 to 5 V input channels while providing 4-20 mA analog outputs. Furthermore, the module supports eight input loops and eight output loops with non-isolated differential input architecture.

The module supports transmitter power supply output from 22.8 to 26.4 VDC and allows channel-level selection between 2-wire and 4-wire transmitter connections. Therefore, it can interface with standard process transmitters connected to Yokogawa STARDOM controller systems.

For Yokogawa process instrumentation applications, signal handling includes compatibility considerations for 4-20 mA HART loop protocol environments. However, the NFAI841-S00 specification does not define internal HART communication functions. Channel isolation is not provided because this module uses a non-isolated I/O design.

Frequently Asked Questions

Q: Does the Yokogawa NFAI841-S00 provide channel-to-channel isolation?
A: No. The NFAI841-S00 is a non-isolated analog I/O module. The input channels use differential input circuitry without galvanic isolation between channels.

Q: What analog signals can the NFAI841-S00 process?
A: The module accepts 1 to 5 V and 4-20 mA input signals and provides 4-20 mA analog outputs through eight input and eight output channels.

Q: Can the transmitter power supply configuration be adjusted for different field devices?
A: Yes. The module provides transmitter power supply output and supports 2-wire or 4-wire transmitter selection through the setting pin configuration.

Field Installation Guidelines

Install the NFAI841-S00 module according to Yokogawa STARDOM controller hardware installation procedures.

Connect analog signal wiring using appropriate shielded cables for industrial environments. Ground cable shields according to the system grounding design to reduce electrical interference.

Separate analog signal cables from high-voltage power cables and switching circuits. Maintain correct polarity for 4-20 mA loops and verify transmitter wiring before energizing the module.

Confirm the controller backplane connection and power supply capacity before installation. Because the module uses non-isolated channels, verify field device grounding and signal reference conditions before commissioning.