NFAI841-S50 Yokogawa FIO Series Datasheet & Technical Manual

Analog Input Output Module | Yokogawa NFAI841-S50

Analog Input Output Module | Yokogawa NFAI841-S50

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Yokogawa NFAI841-S50 Analog I/O Module The Yokogawa NFAI841-S50, also cataloged as the NFAI841 Analog I/O Module, operates as a dedicated...

SKU: NFAI841-S50

Manufacturer: Yokogawa
Product No.: NFAI841-S50
Product Type: Analog Input Output Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 450g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Yokogawa NFAI841-S50 Analog I/O Module

The Yokogawa NFAI841-S50, also cataloged as the NFAI841 Analog I/O Module, operates as a dedicated hardware component for simultaneous 4-20 mA DC input and output signal processing within CENTUM VP Distributed Control System platforms.

Suffix Breakdown & Model Matrix

NFAI841: Analog I/O Module (4 to 20 mA, 8-channel input / 8-channel output)
-S: Standard hardware type
5: Basic type with no intrinsic explosion protection
0: Basic type with standard conformal coating

Hardware Specifications

Parameter	Specification
Model	NFAI841-S50
Brand	Yokogawa
Origin	Japan
Weight	0.35 to 0.45 kg
Dimensions	Standard FIO single-slot width
Operating Temp	-20 deg C to +70 deg C
Power Consumption	230 mA (5 V DC), 540 mA (24 V DC)
Input Channels	8 channels, non-isolated, 4-20 mA DC
Output Channels	8 channels, non-isolated, 4-20 mA DC
Accuracy	+/- 16 uA
Temperature Drift	+/- 16 uA per 10 deg C
Data Update Period	10 ms
Isolation	1500 V AC between I/O channels and system backplane (1 min)
Environmental Rating	ISA G3 corrosion resistance

DCS Process Control & Instrumentation Attributes

The NFAI841-S50 integrates 8 analog input channels and 8 analog output channels onto a single FIO card footprint. To preserve signal fidelity, the module utilizes internal multiplexing linked to a central analog-to-digital converter for inputs, and independent digital-to-analog converters for loop current outputs. While individual channels share a common negative return path (non-isolated design), a 1500 V AC galvanic isolation barrier separates the entire process-side circuitry from the sensitive backplane logic. This design shields the controller network from high common-mode field disturbances and electrical line noise.

Frequently Asked Questions

Q: How should power distribution be structured given that the channels are non-isolated?

A: Because the 8 input and 8 output channels share a common internal ground line, you must ensure that all external field loops operate on the same potential. Avoid connecting transmitters powered from different non-isolated power grids to prevent ground loops.

Q: Is this combined I/O module compatible with dual-redundant deployment?

A: Yes. The NFAI841-S50 supports dual-redundant installation slots. If a critical internal component fails, the system triggers a seamless switchover to the redundant module without disrupting active field loop output values.

Q: Can this standard module connect directly to field transmitters in Zone 1 or Zone 2 hazardous areas?

A: No. Suffix codes "5" and "0" denote a lack of internal explosion-proof protection. Any field signals routed from hazardous classification zones must pass through external intrinsic safety barriers or galvanic isolators before entering the module.

Field Installation Guidelines

Mounting Method: Insert the module vertically into the designated slot of the FIO node unit rack. Ensure the retaining levers lock securely to prevent communication disruption with the backplane bus.
Cabling Integrity: Make field terminations using standard pressure clamp terminal blocks or dedicated KS1 interface cables. Securely torque terminal screws to minimize junction resistance on the 4-20 mA loops.
Grounding Configuration: Connect the overall cable shields to the designated system cabinet instrument ground bar. Avoid multiple shield ground points to prevent circulating loop currents.
Thermal Constraints: Maintain adequate cabinet ventilation. If ambient internal temperatures approach the upper 70 deg C operating threshold, arrange hardware configurations to space out modules and prevent thermal drift.

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