Description

Yokogawa NFAI141-H00 Analog Input Module

The Yokogawa NFAI141-H00, also cataloged as the NFAI141 Analog Input Module, operates as a dedicated hardware component for acquiring 4-20 mA process signals within CENTUM VP and CENTUM CS 3000 Distributed Control Systems. It is designed for direct electrical execution of analog-to-digital conversion and HART protocol communication.

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa
Origin	Japan
Weight	Approx. 0.36 kg (0.79 lbs)
Dimensions	Compact module for standard FIO slot
OperatingTemp	0 to 55 degC (ambient operation)
PowerConsumption	Max 320 mA @ 5 VDC (internal node)
ModuleType	Analog Input Module (Current Input)
Channels	16 isolated channels
InputSignal	4-20 mA DC
Communication	HART 5 / 6 / 7 protocol pass-through
AllowableInputCurrent	24 mA
InputResistance	Power ON: 250 Ω; Power OFF: ≥500 Ω
Accuracy	±0.1% of full scale
DataRefreshCycle	10 ms
WithstandVoltage	1500 V AC, 1 min (input to system)
HotSwappable	Yes
SystemCompatibility	CENTUM VP / CS 3000 FIO

Process Control & DCS Features

The NFAI141-H00 provides channel-to-channel isolation to prevent signal interference between analog inputs. HART communication allows digital configuration and diagnostics without disrupting the 4-20 mA loop. Cold junction compensation (CJc) is internally applied for improved measurement stability under ambient temperature fluctuations. This module supports concurrent analog signal processing and digital overlay, maintaining data integrity across redundant FIO nodes.

Frequently Asked Questions

Q: What are the limitations for hot-swapping the NFAI141-H00?
A: The module can be replaced online without shutting down the FIO system. Ensure loop wiring is stable and no surge voltage is present during removal.

Q: Can the module handle signals exceeding 20 mA?
A: The allowable input current is 24 mA. Signals above this may trigger overcurrent protection; do not exceed specified ratings.

Q: Is firmware update required for HART protocol compatibility?
A: The module supports HART 5/6/7 by default; firmware updates are generally not required for standard DCS operations.

Field Installation Guidelines

• Install the module in the FIO slot with proper alignment to prevent connector damage.
• Maintain shielded wiring continuity to system ground to minimize electrical noise.
• Route analog signal cables separately from power lines to avoid crosstalk.
• Ensure ambient temperature remains within the rated range for stable operation.
• Verify isolation between channels when connecting multiple field devices.

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems