Yokogawa AAI141-S50/K4A00 16-Channel Analog Input Module

The AAI141-S50/K4A00 is a 16-channel analog input module manufactured by Yokogawa for receiving 4-20 mA DC signals from field transmitters. It uses a non-isolated channel configuration and supports both 2-wire and 4-wire transmitter connections, selectable individually for each channel through setting pins. Furthermore, its 10 ms data update period supports regular acquisition of analog process signals.

Input Channel Configuration

The module provides 16 non-isolated analog input channels for 4-20 mA DC signals. Each channel measures the current supplied by a connected transmitter and converts it into input data for the control system. The allowable input current is 27 mA, which defines the specified maximum input current.

Meanwhile, the input resistance varies with the operating condition. When powered on, it ranges from 400 ohms at 20 mA to 1000 ohms at 4 mA. When powered off, the input resistance is at least 500 kohms.

Transmitter Connection and Power Supply

The AAI141-S50/K4A00 supports both 2-wire and 4-wire transmitters. Users can select the connection type separately for each channel through the corresponding setting pin.

In addition, the module provides transmitter power with an output current limit of 27 mA. The specified transmitter supply voltage is at least 14.8 V at 20 mA and no more than 26.4 V at 0 mA. Therefore, the connected transmitter must meet these voltage and current conditions.

Measurement Performance

The module has a specified input accuracy of +/-16 uA and a temperature-related drift of +/-16 uA per 10 deg C change in ambient temperature. Its data update period is 10 ms, while the step response time is 100 ms.

These specifications describe different aspects of signal acquisition. For example, the update period indicates how frequently the module refreshes input data, whereas the step response time describes its response to a change in the input signal.

Technical Specifications

Frequently Asked Questions

Q: How many analog input channels does the AAI141-S50/K4A00 provide?

A: It provides 16 non-isolated analog input channels, each designed to receive 4-20 mA DC signals.

Q: Can the AAI141-S50/K4A00 connect to both 2-wire and 4-wire transmitters?

A: Yes. The module supports both transmitter configurations. Users select the connection type individually for each channel using the setting pins.

Q: What is the data update period of this module?

A: The data update period is 10 ms, and the specified step response time is 100 ms. These values describe the data refresh interval and response to input changes, respectively.