Technical Description
The NFAI841-S50 S2 is a versatile hybrid analog module designed for Yokogawa CENTUM VP and ProSafe-RS control architectures. It integrates 8 analog input channels and 8 analog output channels within a single FIO (Field Interface Option) module, providing a compact and efficient solution for localized control loops.
Each channel supports standard 4–20 mA current signals, allowing the module to interface directly with field transmitters, actuators, and valve positioners. The S2 designation represents a specific hardware revision, ensuring improved stability and long-term compatibility with modern FIO communication buses.
By combining both input and output functionality in one module, the NFAI841-S50 S2 helps simplify I/O rack configurations, reduce hardware requirements, and optimize space usage in distributed control nodes.
Technical Specifications
| Parameter | Specification |
|---|---|
| Channel Configuration | 8 Analog Inputs / 8 Analog Outputs |
| Signal Range | 4–20 mA DC (input and output) |
| Input Impedance | 250 Ω |
| Output Load Resistance | 0–750 Ω |
| Conversion Accuracy | ±0.1% of full scale |
| Data Refresh Cycle | 10 ms |
| Isolation | 1500 V AC between field terminals and system logic |
| Temperature Coefficient | ±100 ppm/°C |
| Power Consumption | 320 mA @ 5 V DC (internal) / 150 mA @ 24 V DC (external) |
| System Compatibility | Yokogawa CENTUM VP FIO nodes |
| Hardware Revision | S2 |
Operational Application
The NFAI841-S50 S2 is commonly deployed in modular process skids, water treatment facilities, and remote telemetry units (RTUs) where mixed I/O requirements exist.
Because the module includes both analog input and output capabilities, it can manage a complete control loop within a single module. For example, it can receive a signal from a pressure or flow transmitter while simultaneously sending a control signal to a regulating valve or actuator.
This dual-function capability reduces the physical footprint of control cabinets, simplifies marshalling design, and lowers overall system hardware costs, particularly in distributed or non-redundant control installations.
Frequently Asked Questions
Can the inputs and outputs be used independently?
Yes. The 8 analog inputs and 8 analog outputs operate as independent circuits within the control system software, allowing them to be assigned to separate process loops or control functions.
Does this module support HART communication?
No. The NFAI841-S50 S2 is a standard analog I/O module without built-in HART passthrough capability. For HART-enabled functionality, users should consider AAI-series modules or dedicated HART-compatible I/O modules.
What terminal block is compatible with this module?
The module typically uses standard FIO pressure-clamp or screw terminal boards. The /S50 suffix indicates a specific terminal interface configuration, so it is recommended to verify backplane connector compatibility before installation.
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