ECPA42-2 B & R Automation
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The B & R Automation ECPA42-2 is a multi-control module from the ECP Multi Control Modules series with four outputs and a resolution of 11 bits. It features a ±20 mA channel current limit, 0.2 percent linearity, and an output signal range of 0 to 20 mA. The module operates without galvanic isolation and supports a maximum load of 560 ohms.
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Product Description:
The ECPA42-2 is an analog output module produced by B & R Automation for the ECP Multi Control Modules series. It fits into an ECP backplane and supplies four independent current channels that translate digital words from the controller into process-level signals for valve positioners, drives, or indicator meters. By embedding the conversion hardware directly on the card, the module simplifies wiring and gives machine programmers deterministic control of current loops used throughout industrial automation.
Each channel sources a programmable current from 0 to 20 mA, and the converter resolves that range with 11-bit precision, providing 2,048 discrete steps for fine adjustment. The load resistance can be as high as 560 Ω before the output saturates, so typical 250 Ω measurement shunts remain well within the drive capability. An internal limit clamps the channel to ±20 mA to protect downstream devices from overcurrent faults. Overall transfer accuracy is supported by a linearity of 0.2 %, meaning the current stays close to the commanded value across the full span. The card draws 1.7 W from the +15 V rail and 0.5 W from the +8 V logic supply. It has no galvanic isolation, so system grounding must prevent potential differences between field wiring and control electronics.
Zero-point stability is characterized by an offset of ±0.2 % at 20 °C and an offset drift of ±0.08 % from 0 to 60 °C, ensuring minimal deviation when the ambient temperature changes. Span accuracy is maintained by a gain drift limited to ±0.04 % / °C, keeping the scale factor nearly constant over the same temperature range. Worst-case power dissipation reaches 3.0 W when the channels drive sinks referenced at −30 V, which should be considered when calculating enclosure cooling requirements.
