3AI775.6 B & R Automation
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The B & R Automation 3AI775.6 is part of the System 2005 Controllers series and features 8 differential analog input channels with a 12-bit converter resolution. It provides input-to-PLC isolation, has a basic accuracy of ±0.1 percent at 25°C, and offers a conversion time of less than 1 ms. The unit operates with a total power of 4.5 watts and carries an IP20 protection rating.
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Product Description:
The 3AI775.6 analog input module is produced by B & R Automation for the System 2005 Controllers series. Installed in a modular rack, the unit occupies a single slot and mates with the backplane bus that distributes power and field data. It converts low-level process voltages into numerical values so the PLC can regulate temperature, pressure, or flow in automated machinery and auxiliary equipment.
It accepts 8 analog inputs that are wired as isolated pairs, and each channel is processed by a successive-approximation converter with 12-bit resolution. The sampling path completes in less than 1 ms conversion time, enabling rapid proportional control without cycle overruns. Measurement accuracy remains within ±0.1% at 25 °C, which suits closed-loop tasks that require tight setpoint tracking. Sensors encounter a fixed 50 Ω input load, and this low impedance helps preserve signal quality when the module is connected to bridge, thermocouple, or shunt sources. Because wiring is differential, common-mode disturbances are rejected, improving immunity on installations that span long cable trays. Raw data are delivered to the CPU in signed INT format, and the lack of input-to-input isolation requires a shared sensor ground.
Power demand is limited to 3.5 W at 24 VDC from the peripheral supply and 1.0 W at 5 VDC from the logic rail, bringing total dissipation to 4.5 W that can be handled by standard enclosure airflow. The board carries an IP20 rating, so live parts must be shielded inside a control cabinet. Converter diagnostics are indicated by a front-panel LED that lights steadily during normal operation and flashes when an out-of-range condition is detected. Optocouplers provide input-to-PLC isolation, allowing the controller backplane to remain referenced to clean logic ground even when field transducers float on noisy potentials.
Frequently Asked Questions about 3AI775.6:
Q: How many analog input channels does the 3AI775.6 have?
A: The 3AI775.6 module provides 8 analog input channels for differential measurements.
Q: What is the analog input conversion time for the 3AI775.6?
A: This model offers a conversion time of less than 1 ms per channel.
Q: What is the measurement accuracy of the 3AI775.6 at room temperature?
A: The 3AI775.6 achieves a basic accuracy of ±0.1% at 25°C.
Q: Does the 3AI775.6 provide input-to-input or input-to-PLC isolation?
A: The analog inputs on the 3AI775.6 are not isolated from each other but are isolated from the PLC.
Q: What is the resolution of the analog-to-digital converter in the 3AI775.6?
A: This module features a 12-bit converter resolution for its analog inputs.
