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Description
Yokogawa NFAI135 Analog Input Module
Configured for 4-20 mA signal acquisition in CENTUM VP and CENTUM CS 3000 I/O subsystems, the Yokogawa NFAI135-S00 (NFAI135 Analog Input Module) provides direct electrical termination and digitization of field transmitter current loops into DCS process data via a 40-channel isolated input architecture.
Suffix Breakdown & Model Matrix
Model: NFAI135
Suffix: S00
S: Standard type configuration
0: Standard hardware revision
0: Basic configuration variant without additional protective or coating options
The module implements per-channel electrical isolation within the CENTUM I/O node backplane interface, separating each 4-20 mA loop termination from adjacent measurement paths and system logic ground. This architecture reduces ground loop propagation paths and limits common-mode disturbance transfer during field-side transient events. Integration is aligned with Yokogawa CENTUM VP I/O node assemblies such as ANB10S and ANT10D, where isolation domains are maintained at the terminal and A/D conversion boundary.
Frequently Asked Questions
Q: Can the module accept voltage input directly (e.g., 1-5 VDC)? A: The documented primary configuration is 4-20 mA current input. Voltage measurement requires external conversion via precision shunt resistor unless explicitly supported by variant wiring configuration.
Q: Is hot-swap supported during operation? A: Hot insertion/removal is supported only within redundant node configurations and approved I/O base assemblies. Signal disturbance may occur if removed under active single-redundant operation.
Q: What is the electrical isolation boundary of the module? A: Isolation is implemented between each input channel and between input circuitry and system backplane logic, with specified withstand levels up to 1500 VAC.
Field Installation Guidelines
Maintain shield grounding at single-point termination on cabinet side to avoid loop currents on 4-20 mA return conductors.
Ensure field wiring separation between analog input loops and high-voltage switching conductors to minimize capacitive coupling.
Verify correct seating on Yokogawa I/O node base units (e.g., ANB10S / ANT10D) before energizing backplane power.
Use specified Yokogawa signal cables (e.g., KS1) or equivalent shielded twisted pair conductors for loop integrity.
Do not exceed rated input current of 30 mA per channel during loop testing or transmitter simulation.
