7MM432.70-1 B & R Automation
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The 7MM432.70-1 is a controller manufactured by B & R Automation as part of the System 2003 Controllers series. It features 6 digital input channels operating at 24 VDC, 2 current measurement channels with a resolution of 50 mA, and supports a peak current of 8.0 A for up to 2 seconds. The unit has two motor bridges, a power consumption of 2.5 W, a protection type of IP20, and a PWM frequency of 16 kHz.
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Product Description:
B&R Automation's System 2003 Controllers series includes the 7MM432.70-1 module, a compact motion and I/O controller used for coordinating low-voltage servo stages inside distributed machine cabinets. The unit combines incremental encoder evaluation, current measurement, and digital signal processing so that a higher-level PLC can regulate position loops and diagnose axis performance in real time. Within an automation cell, it serves as the local interface between small DC motors, feedback sensors, and the 24 V power domain, reducing wiring lengths while maintaining deterministic cycle times.
Six opto-isolated digital inputs operate at 24 VDC logic, allowing direct connection to limit switches or proximity sensors, and the controller accommodates 6 channels so each axis can monitor multiple reference points. For velocity feedback, it performs encoder evaluation up to an edge multiplication factor of 4x, while its dedicated ABR paths accept signals at 20 kHz without missing transitions. Two galvanically isolated shunts provide 2 current measurement channels with a resolution of 50 mA, supporting closed-loop torque control and load detection. The input circuit is configured as a sink type, can withstand transient overvoltage up to 35 VDC without functional loss, and the ABR section offers six incremental input channels for quadrature tracking.
Two integrated motor bridges can source a continuous 4.0 A. They can deliver bursts of 8.0 A for up to 2 s, matching the demands of small brushed DC drives during acceleration. Pulse-width modulation is clocked at 16 kHz. This minimizes audible noise while keeping switching losses within the module's 2.5 W power budget. Environmental protection is rated at IP20, indicating that the housing is finger-safe and intended for mounting inside a closed electrical cabinet.
