Product Description:

The X20AO2622/PL3 analog output module is produced by B & R Automation and belongs to the X20 Fieldbus Input Output Modules series. Intended for distributed control systems, the unit converts numerical setpoints from the controller into electrical current or voltage signals that drive actuators, positioners, or variable-speed drives on the machine line. It mounts on the X20 backplane and exchanges process data over the internal bus while drawing only minimal bus power, making it suitable for high channel density applications.

The module provides 2 isolated analog outputs that can be parameterized for voltage or current ranges. Each channel processes commands with a 12-bit voltage resolution and a 12-bit current resolution; the least-significant steps are 2.441 mV and 4.883 µA, respectively, allowing fine adjustment of drive speed or valve position. A conversion cycle finishes in 200 µs, after which the output settles within tolerance in 1 ms. To suppress aliasing, an internal analog filter limits the signal bandwidth to 10 kHz. Voltage accuracy is affected by a gain error of ±0.15% and an offset error of ±0.05%. Integral nonlinearity remains below 0.007%, so the transfer curve stays nearly straight across the entire range. The electronics require only 0.01 W from the X20 bus and 1.1 W from the system’s internal I/O supply, minimizing cabinet heat. When configured for voltage mode, the load must not fall below 1 kΩ to preserve proper operation.

An insulation barrier rated at 500 Veff provides galvanic isolation between the output stage and the X20 backplane, protecting the CPU from potential field voltages. If a load is shorted, the driver restricts flow to ±40 mA, a predefined current limit that prevents damage while diagnostics flag the error. These protections complement the fast analog performance covered earlier and allow the module to share racks with safety I/O without additional isolation cards.