Yokogawa NFAI143-H50 16-channel HART Isolated Analog Input Module

I. Basic Model Positioning
Brand: Yokogawa
Model: NFAI143-H50
Series： STARDOM NF Series Modular IO， compatible with CENTUM VP DCS， STARDOM FCN/FCJ controllers， and ProSafe-RS safety system
Model suffix interpretation
NFAI： NF Series Analog Input
H： Built-in HART communication (readable and writable for intelligent transmitters)
50： General standard type， no explosion-proof intrinsic safety certification； the old model NFAI143-H00 has been discontinued, H50 is a direct upgrade replacement
Differences： AAI143-H50 is a CS3000/CENTUM VP rack-mounted IO； NFAI143 is a STARDOM distributed DIN rail IO， the backplanes of the two are not compatible.

Core Hardware Channel Specifications
Channel quantity： 16 fully isolated 4–20mA analog inputs
Signal compatibility： 4–20mA / 0–20mA two-wire / four-wire transmitters， single-channel jumper switching
Built-in HART： Each channel adds HART digital signal， which can read instrument tag numbers， ranges， fault diagnosis， PID parameters， temperature compensation data
Isolation level： Each channel is isolated from each other， channel ↔ system side withstands 1500VAC for 1 minute， eliminating ground loop interference
Sampling accuracy： ±0.1% FS， temperature drift ≤ ±0.01%/℃； 16-bit ADC resolution
Refresh cycle： The entire machine has a 10ms high-speed acquisition， meeting the requirements of process closed-loop control
Input impedance： 250Ω standard sampling resistor， transducer circuit power supply 19.0~25.5VDC

Electrical and Environmental Parameters
Power Supply
System backplane 5V bus： 230mA
Field 24VDC power supply： 540mA (power supply for transmitters)
Installation： Standard DIN rail snap-in installation， module width 32.8mm， high-density cabinet arrangement
Size and weight： 100×78×32.8mm， net weight approximately 0.3kg
Operating environment
Operating temperature： -20℃ ~ +70℃
Storage： -55℃ ~ +85℃
Humidity 5%~95% RH without condensation， industrial EMC anti-interference level
Built-in protection： input overcurrent， open circuit detection， short circuit protection， when disconnected， the system reports instrument failure

Core Function Highlights
Full-channel independent HART
No need for additional HART multiplexer， the upper station can directly online calibrate pressure / level / flow transmitters， remotely troubleshoot instrument zero drift， diaphragm failure.
Break-line self-diagnosis
Real-time detection of 4mA or below break-line faults， distinguish “process zero position” from “instrument break-line”， reducing false alarms in the field.
Distributed expansion
FCN/FCJ controllers can be locally or remotely mounted on the rack， a single controller can expand up to multiple NF series IO， suitable for large-scale refining and power plants for distributed measurement points.
System compatibility
Collect data seamlessly uploaded to CENTUM VP operation station， ProSafe-RS safety logic， participate in SIL interlock control.

Typical Application Scenarios
Oil， chemical， coal chemical process DCS pressure， flow， level， temperature collection
Power plant， hydropower plant auxiliary control system transmitter signal collection
Pharmaceutical， water treatment intelligent HART instrument centralized monitoring
Distributed remote cabinet (on-site local IO cabinet) signal collection

Model Distinction of the Same Series (Not Directly Interchangeable) Table
Model Key Differences
NFAI143-H50 With HART, no explosion-proof feature, general-purpose field device (this model)
NFAI143-S50 Without HART, only pure analog acquisition, lower cost
NFAI143-H00 Old model has been discontinued, hardware interface is consistent, H50 is a perfect replacement
AAI143-H50 CENTUM VP rack card, non-DIN rail NF series