Product Description:

The 7AI261.7 is an analog input module manufactured by B&R Automation for the System 2003 Controllers series. Designed for installation next to CPU and output slices, it conditions bridge sensor signals so the PLC can act on precise load or pressure data. By providing a dedicated measurement channel, the module supports strain-based feedback loops in assembly lines, packaging equipment, and other motion applications.

Its converter works at 24-bit resolution, yielding 16,777,216 codes that capture minute gauge changes. Basic accuracy is ±55 ppm with an offset of ±11 µV at 25 °C, keeping error small relative to span. The module excites the bridge with 4.5 VDC (±3%) and can source up to 60 mA, so most sensors do not need an external supply. Input loading is negligible because the differential circuit draws <140 nA. The housing is rated IP20, so it suits indoor cabinets and offers finger-safe terminals. Additional safeguards include short-circuit and overload protection, and the module tolerates accidental supply wiring. Because channel-to-PLC isolation is absent, ground management is required, while the 4-wire connection helps reduce lead resistance errors.

The digital value is sent to the CPU in a 32-bit physical unit format, providing a wide numeric range for scaled engineering units. With a power draw of 0.6 W, the slice places little demand on the backplane supply and allows dense racks. The housing follows the Screw-In Module concept of System 2003, locking into the carrier without tools and standing up to vibration. The module is intended for a Full-Bridge Strain Gauge connected through a 4-wire interface, and the differential topology improves noise rejection on long sensor leads. The signal path helps limit common-mode noise even though channel-to-PLC galvanic separation is not provided.