A-B 1321-3RB400-B Universal Analog Input

Key Features and Specifications

While specific specifications vary greatly depending on the module series and type, here are common features and parameters you'll find in AB input modules:

General Features

• Module Type: Digital (DC, AC, Relay), Analog (Voltage, Current, RTD, Thermocouple).

• Number of Inputs: Typically ranging from a few (e.g., 2, 4) to many (e.g., 8, 16, 32, 64) channels per module.

• Isolation: Many modules feature optical isolation to protect the control system's logic circuits from electrical transients and noise in the field wiring. This enhances system reliability and safety.

• Diagnostics: Advanced modules often include built-in diagnostics for fault detection, such as wire-off, short-circuit, or open-circuit detection.

• Filtering: Input modules typically incorporate filtering to reduce electrical noise, ensuring accurate and stable signal readings.

• Form Factor: Available in various form factors to suit different control system architectures (e.g., CompactLogix, ControlLogix, Micro800, POINT I/O).

Electrical Specifications (Common Examples)

• Input Voltage Range:

• Digital: Common ranges include 10-30V DC, 120V AC, or 240V AC.

• Analog: Standard ranges like 0-10V DC, +/-10V DC, 4-20mA, or 0-20mA.

• Input Current: Specified for digital inputs, indicating the current drawn by the input when active.

• Input Impedance: Relevant for analog voltage inputs.

• Resolution (for Analog): Measured in bits (e.g., 12-bit, 16-bit), indicating the module's precision in converting analog signals to digital values. Higher resolution means finer measurement increments.

• Conversion Time (for Analog): The time it takes for the module to convert an analog signal to a digital value.

• Accuracy (for Analog): The deviation of the measured value from the true value, often expressed as a percentage of the full scale.

• Scan Time/Update Rate: How quickly the module reads and updates input data.

• Wiring Type: Sink (sourcing output from field device) or Source (sinking output from field device) for digital DC inputs.

Environmental Specifications

• Operating Temperature: Typically -20°C to 60°C (or wider for industrial-grade modules).

• Storage Temperature: Range for safe storage.

• Humidity: Max ambient humidity (non-condensing), e.g., 5% to 95%.

• Vibration and Shock Resistance: Designed to withstand industrial environments.

• Certifications: UL, CE, c-UL-us, ATEX, etc., depending on region and application.

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