GE IC694ALG221A Analog Current Input Module

FAQ

Q1: What is the GE Fanuc IC694ALG221A used for?
The IC694ALG221A is used to collect analog current signals from field devices such as pressure transmitters, flow meters, level sensors, and other 4–20 mA instruments, then convert these signals into digital values for RX3i PLC processing.

Q2: How many analog input channels does the IC694ALG221A provide?
The module provides four differential analog current input channels, allowing four separate current-loop devices to be connected simultaneously.

Q3: What input signal ranges are supported by the IC694ALG221A?
The module supports two selectable current input ranges: 0–20 mA and 4–20 mA. These ranges are commonly used in industrial measurement and control systems.

Q4: What is the resolution of the IC694ALG221A?
The module provides 12-bit analog-to-digital conversion. The resolution is 4 µA per count for 4–20 mA input and 5 µA per count for 0–20 mA input.

Q5: Does the IC694ALG221A require an external power supply?
Yes. The module requires an isolated 24 VDC supply in addition to the 5 VDC power provided by the RX3i backplane.

Q6: What PLC platform is compatible with the IC694ALG221A?
The IC694ALG221A is designed for the GE Fanuc PACSystems RX3i platform and can be installed in any compatible RX3i I/O slot.

Q7: Does the IC694ALG221A provide electrical isolation?
Yes. The module provides optical isolation between field wiring and the PLC backplane, with isolation ratings of 250 VAC continuous and 1500 VAC for one minute.

Q8: What should be checked before replacing an IC694ALG221A module?
Before replacement, verify the RX3i chassis compatibility, 24 VDC isolated power supply, current loop wiring, input range configuration, terminal connections, and PLC hardware configuration to ensure correct operation after installation.

GE IC694ALG221A

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