Product Description:

B&R Automation's ECPA81-21 is an analog output module within the ECP Multi Control Modules series. The board-level unit provides eight voltage channels that connect process controllers to final actuators in industrial automation cells. By converting digital setpoints from the central PLC into analog levels, the module permits proportional drive commands, valve positioning, or reference generation inside a compact backplane format. Its design focuses on precision signal scaling and low thermal drift so that downstream equipment receives repeatable output even under fluctuating ambient temperatures.

The analog stages are factory-trimmed for a total gain error of ±3.5 % when terminated by the specified 500 Ω load. Temperature variation is moderated by a gain drift of ±0.04 %/°C, meaning a 10 °C rise changes the output span by only 0.4 %. Static accuracy is further supported by a linearity deviation of 0.2 % across the full code range and a room-temperature offset of ±0.2 %. For applications requiring heavier sinks, the drivers can sustain a maximum burden of 560 Ω without exceeding compliance limits. Offset drift stays within ±0.08 % from 0 °C to 60 °C, so zero shift remains low across normal cabinet climates. The circuitry does not provide galvanic isolation, so the common return must be referenced carefully to avoid ground loops.

The module presents 8 individually buffered channels, each resolved to 12-bit so that one count corresponds to roughly 0.025 % of full scale. Internal converters operate from three supply rails; consumption reaches 4.4 W when the -30 V rail is active and 3.3 W on the +15 V line, while the auxiliary +8 V rail adds only 0.5 W. These modest losses simplify enclosure thermal planning. This helps keep output error and power behavior predictable during worst-case duty cycles.