Product Description:

B&R Automation produces the X20DO4332-1, a digital output unit in the X20 Fieldbus Input Output Modules series. Installed on the X20 backplane, it switches loads such as solenoid valves and indicator lamps from a common 24 VDC supply and passes status data to the controller bus, allowing coordinated actuator control in industrial automation cells. This arrangement lets the controller manage field devices directly from a compact slice I/O assembly.

The module offers 4 discrete channels, and each channel is referenced to a system voltage of 24 VDC. Per-channel load capacity reaches a nominal 2 A, while the carrier can distribute a collective load of 8 A across all outputs. Because the output circuit is configured as a source stage, positive switching is possible without external wiring changes. An auxiliary actuator rail supplies 0.5 A for sensor power, and the three-wire connection pattern brings supply, return, and signal into a single plug. Output stages leak only 5 µA when turned off, which helps prevent unintended actuation of high-impedance devices. Oversampled-pulse and pulse-width-modulation modes are available, enabling frequency-coded or duty-cycle-coded actuation without additional motion hardware. Built-in electronics withstand a direct short on the supply line, so external fuse sizing can be based on cable protection alone.

Fast response is supported by a period resolution of 1 µs, while fault reporting is delayed by just 10 ms to filter transient noise. Functional isolation from the backplane is rated at 500 Veff, separating field wiring from internal logic. Mechanical integration follows a mounting pitch of 12.5 +0.2 mm, allowing tight stacking of neighboring modules. Each channel clamps inductive energy at a braking voltage of 0.6 V, which helps reduce electromagnetic emissions during de-energization. The module also signals its operating state through the bus, and PWM operation can be combined with OSP timing for mixed-speed drive tasks.