YOKOGAWA NFAI143-H00 Simulation Input Module
The Yokogawa NFAI143-H00 is a high-density Analog Input Module belonging to the STARDOM FCN/FCJ intelligent controller series.
It is designed to interface field sensors with the control system, specifically supporting HART digital communication for advanced device diagnostics.
1. Introduction
The NFAI143-H00 is a 16-channel, isolated current input module. It primarily receives 4 to 20 mA DC signals from 2-wire or 4-wire transmitters.
The “H” in the suffix indicates HART Communication capability, allowing the module to not only read process variables but also transmit and receive digital information
(like sensor health and calibration data) over the same analog wiring.
2. Technical Parameter Table
| Feature | Specification |
| Model Code | NFAI143-H00 |
| Number of Channels | 16-channel, isolated |
| Input Signal | 4 to 20 mA DC |
| Accuracy | $\pm 0.1\%$ of full scale |
| Data Refresh Cycle | 10 ms |
| Input Step Response | 100 ms |
| Input Resistance | 250 $\Omega$ (Power ON), $\ge$ 500 k$\Omega$ (Power OFF) |
| Withstanding Voltage | 1500 V AC between input and system (for 1 min) |
| Transmitter Power | 24.0 V to 25.5 V DC (current limit: 25 mA) |
| Current Consumption | 230 mA (5 V DC), 540 mA (24 V DC) |
| Weight | Approx. 0.3 kg |
3. Related Models
The NFAI143 is often used in conjunction with other STARDOM or CENTUM FIO components:
NFAI143-H50: The direct replacement/newer version for the discontinued H00 model.
NFAV144: A voltage input variant (1 to 5 V or -10 to +10 V).
NFAI543: The analog output equivalent (16-channel, 4 to 20 mA).
NFTA4S: The pressure clamp terminal block typically used for external connections.
NFBU050: The base module (rack) where these I/O modules are seated.
| ALSTOM | MBCI01N1AB0761B |
| ALSTOM | MCGG22L1CB0753E |
| ALSTOM | MCTI40N1AB0751G |
| ALSTOM | MFAC34N1AA0001A |
| ALSTOM | MVAJ21L1GB0771B |
| ALSTOM | N70032702L |
| ALSTOM | N897164610L |
| ALSTOM | N897164611M |
| ALSTOM | N897164624A |
| ALSTOM | P70035W82V |
| ALSTOM | N895314513L |
| ALSTOM | N895313512X |
4. Product Advantages and Features
HART Integration: Supports digital communication for asset management, enabling remote configuration and detailed sensor diagnostics without extra wiring.
Channel Isolation: Each channel is isolated, preventing electrical noise or ground loops on one circuit from affecting the rest of the system.
Hot-Swappable: Modules can be replaced while the controller is running, ensuring continuous process operation.
Dual Redundancy: Two modules can be configured in a redundant pair; if one fails, the backup takes over in milliseconds.
Versatile Powering: Supports both 2-wire (loop-powered) and 4-wire (self-powered) transmitters, configurable via internal pins.
NFAI143-H00
5. Application Cases
Smart Instrumentation: Ideal for plants using “Smart” transmitters (pressure, temperature, flow) that require periodic remote calibration via HART.
Critical Process Monitoring: Used in chemical and pharmaceutical facilities where high-speed data refresh (10 ms) and isolation are required for safety.
Asset Management Systems: Integrated with Yokogawa’s PRM (Plant Resource Manager) software to track the health of field devices.
6. Other Models in the Same Series
NFAI143-S00: Standard model (without HART communication).
NFAI143-H01: Variant with ISA Standard G3 conformal coating for use in highly corrosive environments (high $H_2S$, $SO_2$).
NFAI141: A non-isolated 16-channel variant used in less electrically noisy environments to save cost.