The IC694ALG392 is an 8-channel analog current/voltage output module used in GE RX3i PLC systems. It provides up to eight single-ended output channels, which can be configured individually as either current loop outputs or voltage outputs. Each channel supports multiple output ranges, including 0–10 V (unipolar), ±10 V (bipolar), 0–20 mA, and 4–20 mA, making the IC694ALG392 suitable for a wide range of industrial analog control applications.
Each output channel of the IC694ALG392 performs high-resolution digital-to-analog conversion, supporting approximately 15 to 16 bits of resolution depending on the selected range. The module updates all eight channels every 12 milliseconds, ensuring consistent and timely analog signal output. In current mode, the IC694ALG392 can detect and report open-wire faults back to the PLC CPU, improving diagnostic capability and system reliability.
From a system integration perspective, the IC694ALG392 supports configurable behavior during power or system state changes. The module can be configured to either hold the last output value or reset outputs to zero when the system transitions to STOP mode or experiences power interruption, provided external power remains available. It requires an external isolated +24 VDC power supply, which can be connected via the backplane terminal (TB1) or directly to the module depending on the backplane type.
Additionally, the IC694ALG392 supports detailed configuration of active channels, output scaling, and memory mapping. Output data is mapped through %AQ reference addresses, while module and channel status information is provided through %I reference addresses. Scaling ensures linear conversion between PLC data and analog outputs, such as 0–20 mA mapping to 0–32000 counts or ±10 V mapping to ±32000 counts.
