7AI294.70 B & R Automation
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The 7AI294.70 is a module manufactured by B & R Automation and is part of the System 2003 Controllers series. It features four single-ended inputs for potentiometers, offering a converter resolution of 13-bit and basic accuracy of ±0.1% FS at 25°C. The device includes integrated screw clamp connections, IP20 protection rating, and a power consumption of 0.5 W.
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Product Description:
The 7AI294.70 is an analog input module produced by B&R Automation for the System 2003 Controllers series. It is designed to digitize potentiometer feedback so a host CPU can monitor shaft positions or panel setpoints within an automated cell. By converting four independent single-ended voltage tracks into integers, the device links field-mounted sensors to the control backplane without external signal conditioners. This arrangement is useful in control cabinets where simple wiring and direct signal acquisition are preferred.
The module has a basic accuracy of ±0.1% FS at 25 °C, so the numeric result stays very close to the true potentiometer position. Each channel is sampled in 4 ms, allowing a PLC task cycle to receive updated data at a steady rate. The internal SAR converter provides 13-bit resolution, giving 8192 quantization levels across the full-scale span. With an input bias current of less than 0.2 µA, sensor loading remains negligible and potentiometer linearity is preserved. The module provides 4 inputs in a single-ended topology, so the negative terminals share a common module ground and wiring remains straightforward. This channel arrangement suits applications that need several position or setpoint signals to be read in parallel without added interface hardware.
Front-edge screw clamps accept field conductors, while the screw-in mechanical design secures the unit on the System 2003 rack. The dedicated potentiometer excitation rail supplies +4.5 V ± 3% at 40 mA, removing the need for auxiliary power blocks when compatible sensors are connected. Overall consumption remains 0.5 W, which helps limit loading on the backplane power rail when multiple modules are installed. The housing has an IP20 rating for installation inside standard control cabinets. Output words are stored in controller memory as INT values, which simplifies signed arithmetic and routine data handling in IEC 61131-3 code. Protection against supply-voltage miswiring and an internal short-circuit or overload circuit add resilience during startup and normal operation.
Frequently Asked Questions about 7AI294.70:
Q: How many input channels are available on the 7AI294.70 module?
A: The 7AI294.70 module provides four single-ended inputs for sensor connections.
Q: What type of connection does the 7AI294.70 module use?
A: This module features integrated screw clamps for reliable electrical connections.
Q: What is the converter resolution specified for the 7AI294.70?
A: The converter resolution of this module is 13-bit, ensuring detailed signal processing.
Q: What is the protection rating of the 7AI294.70 module?
A: The 7AI294.70 is equipped with IP20 protection rating for operation in controlled environments.
Q: What potentiometer supply voltage does the 7AI294.70 provide?
A: This module supplies a potentiometer supply voltage of +4.5 V ±3% at 40 mA for sensor operation.
