ET-2228CI is an 8-channel analog output module with channel-to-channel isolation. All analog output channels can be individually configured with output ranges, including 0 ~ 5 V, 0 ~ 10 V, 4 ~ 20 mA, and 0 ~ 20 mA. The module can be set as voltage or current outputs via the software. It offers configurable AO power-on value and safe value settings, as well as open wire detection for each 4 ~ 20 mA output channel. The module complies with the RF (Radiated, radio-frequency) immunity of IEC 61000-4-3 standard and provides EMS (EFT/ESD/Surge) protection, 3000 VDC I/O isolation, and channel-to-channel isolation to enhance noise protection capabilities in industrial environments.

Moreover, the module supports I/O Pair-Connection functionality, allowing the establishment of AI-to-AO pairing connections with the remote module via Ethernet. Once configured, remote AI data can be written to local AO channels in Pull mode via Modbus TCP.

ET-2228CI supports the MQTT protocol, serving as a publisher and subscriber of messages. When connected to an MQTT Broker Server, it can publish real-time statuses of I/O in the form of topics and receive messages from subscribed topics. If a disconnection occurs between the module and the broker during communication, its mechanism for reconnecting can automatically restore the connection. Additionally, its Keep-Alive Interval mechanism ensures a continuous connection with the broker.