Product Description:

The 7AI774.70 analog input module is produced by B&R Automation for the System 2003 Controllers series. It installs in the controller rack to acquire low-level process currents from field devices. The module then relays digitized data to the CPU, allowing accurate monitoring in distributed industrial automation stations. Its role is to convert small analog current signals into values that the control system can process directly.

The module uses a 12-bit converter across four differential channels. Each channel accepts a differential input pair, and sampling is available when the host base contains the AF101 Adapter Module in the CP-Interface slot. With 4 available inputs, multiple transducers can be connected to one module position while preserving rack space. The manufacturer specifies a gain error of 0.05% of the final value, and the linearity error remains at the same margin, so scaling stays consistent across the signal span. Channel-to-channel isolation is not provided, and there is no galvanic isolation between the analog section and the PLC backplane, so external wiring must remain within the permitted common-mode voltage limits.

The offset error does not exceed ±5 µA, which helps maintain zero stability for sensors that return small standing currents. Converted data are transferred to the CPU in INT format, matching the word width used by the System 2003 command set. During operation, the board draws only 0.4 W, which helps limit the power demand of densely populated racks. Environmental protection is rated at IP20, so the unit must be installed inside a control cabinet while remaining protected against direct finger contact. The module uses a Screw-In Module carrier, which helps the card stay secure under vibration without additional rail clamps. It is suited to cabinet-mounted control systems that need compact analog acquisition without isolated channels.