IC694ALG221A GE 4-Channel Analog Current Input Module RX3i

Product Overview: IC694ALG221A Analog Input Module

When process signals must reach a PACSystems RX3i controller without ambiguity, the IC694ALG221A provides a precise interface. This 4-channel analog current input module accepts 0-20 mA and 4-20 mA loops, converting each channel with 12-bit resolution in 2 ms. Consequently, engineers gain exact process visibility for control loops that demand repeatable measurement. The module draws 5 V DC from the backplane bus, so no external supply is required for logic operation.

Originally developed by GE Fanuc and now owned by Emerson, the IC694ALG221A remains part of the RX3i I/O family. Its engineering-grade design targets continuous industrial service, and the 145 × 34 × 140 mm housing fits standard RX3i racks.

IC694ALG221A Technical Specifications

• Channels: 4 analog current inputs
• Input range: 0-20 mA and 4-20 mA
• Resolution: 12-bit
• Conversion time: 2 ms
• Backplane current: 5 V DC from backplane bus
• Operating temperature: 0 to +60°C ambient
• Storage temperature: -40 to +85°C
• Humidity: 5 to 95% non-condensing
• Protection rating: IP20
• Dimensions (H×W×D): 145 × 34 × 140 mm

Notably, the 2 ms conversion time across four channels supports scanning of fast-changing process variables. Meanwhile, 12-bit resolution yields 4096 discrete counts, which is critical when loop accuracy directly affects product quality. Weight is not available in current documentation; refer to official datasheet for weight.

Why the IC694ALG221A Suits Process Control

Consulting engineers often specify current-loop inputs because 4-20 mA signals resist electrical noise over long cable runs. Therefore, the IC694ALG221A fits naturally into flow, pressure, and level monitoring architectures. In addition, the IP20 rating suits clean control cabinets, while the 0 to +60°C ambient range covers most plant-floor environments. For retrofit projects, the module integrates into existing RX3i racks without external transmitters in many cases.

Installation and Maintenance Guidance

Mount the IC694ALG221A in a compatible RX3i backplane slot and verify that the 5 V DC backplane budget accommodates the module. Keep cabinet humidity within 5 to 95% non-condensing and avoid condensing conditions. Periodically inspect terminal connections for corrosion or looseness, and confirm that ambient temperature stays below +60°C. Because the module has no moving parts, wear is minimal; however, environmental contamination remains the primary failure risk. Follow the manufacturer's safety manual for all service procedures.

Availability and Support

Official Emerson production status is unverified, and the IC694ALG221A is currently available through aftermarket channels. Please verify current lifecycle status and availability with AutoDCSTech before ordering. Contact AutoDCSTech with your exact requirements for precise matching.