NFAI841-S00 | Yokogawa Analog I/O Module
The Yokogawa NFAI841 - S00 is a high-performance analog I/O module originating from Japan. It is a key component specially designed for Yokogawa's Centum CS 3000 distributed control system (DCS) and can also work with Stardom controllers. It is widely used in industrial process control scenarios due to its stable performance and flexible configuration. The detailed specifications and characteristics are as follows:
- Core I/O Performance
- Channel Configuration: It adopts an 8 - input and 8 - output channel design, which can simultaneously collect and output multiple analog signals, supporting up to eight control loops in industrial control systems. The input mode is non - isolated differential input, which is suitable for common industrial signal acquisition needs.
- Signal Compatibility: The input signals support DC 4 - 20mA current signals and 1 - 5V voltage signals, and the output signal is fixed as DC 4 - 20mA, which is compatible with most industrial sensors and actuators. The allowable load resistance range is 0 - 750Ω, and the allowable input current is 25mA, which has good adaptability to different load conditions.
- Precision and Conversion: Equipped with a 16 - bit A/D converter, the input accuracy can reach ±0.1% of the full scale, and the output accuracy is ±0.3% of the full scale. The data refresh cycle is 10ms, which can quickly capture and respond to changes in on - site signals, ensuring the timeliness of control. In addition, its temperature drift is up to ±0.01%/°C, which can maintain stable precision under temperature fluctuation conditions.
- Electrical and Connection Specifications
- Power Supply: It has dual power supply requirements. The current consumption is 310mA under 5V DC, and 500mA under 24V DC. There are also sources mentioning that it can be powered by DC 24V alone, which is in line with the common power supply standards of industrial control cabinets.
- Connection Method: It adopts pressure clamp terminals and MIL connector cables for external connection, which is firm and reliable and convenient for wiring and later maintenance. At the same time, it has an open - circuit detection function for input and output channels, and the open - circuit detection current is ≤0.65mA, which can promptly discover wiring faults.
- Fallback Function: The output fallback detection time is 4 seconds. This function can automatically switch to the preset safe output state when an abnormal situation occurs in the module, avoiding dangerous conditions in the production process.
- Physical and Environmental Adaptability
- Physical Dimensions: There are slight differences in the dimension data from different sources. One common set is 110mm×35mm×100mm, and another is 76mm×116mm×26mm. Its weight is about 0.3kg, which is compact and lightweight, facilitating dense installation in control cabinets. It supports DIN rail installation, which is in line with the standard installation mode of industrial modules, and the protection level reaches IP20.
- Environmental Adaptability: The storage temperature range is -40°C to 80°C, and some sources indicate that the working temperature can reach -40°C to 85°C, and the working humidity range is 10% - 90% relative humidity (non - condensing). This enables it to operate stably in harsh industrial environments such as high and low temperatures and high humidity.
- Key Functions and Application Scenarios
- Extended Communication: It supports HART communication. Users can carry out parameter configuration and fault diagnosis of the module through the HART protocol without disassembling the equipment, which greatly simplifies the maintenance work.
- Practical Functions: It has overcurrent protection to prevent module damage caused by excessive current. The software - configurable design allows it to adapt to different process control requirements, and it can also cooperate with the system to realize dual - redundant configuration, improving the reliability of the whole control system.
- Typical Applications: It is widely used in oil and gas, chemical processing, power generation and other industries. It is mainly used for data acquisition and control signal output in processes such as temperature, pressure, and flow, and provides stable signal conversion and transmission support for DCS systems.
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