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                                                            • GE IC694ALG221 Analog Input Module

                                                              Overview

                                                              IC694ALG221 is a 4-channel isolated analog input module for GE Series 90-30 PLC, compatible with RX3i universal backplanes for mixed new & legacy hardware deployment. It converts standard 4–20mA field analog signals into digital values readable by the PLC CPU, widely used to collect pressure, flow, temperature and liquid level measurements in process automation.

                                                              Specifications

                                                              • Channels: 4 isolated analog input channels
                                                              • Signal type: 4–20mA DC current loop
                                                              • Isolation: 500V channel-to-backplane isolation to suppress field interference
                                                              • Resolution: 12-bit analog-to-digital conversion
                                                              • Input impedance: Low impedance design matching standard transmitter loops
                                                              • Single-slot rack-mounted module, hot-swappable on RX3i backplanes
                                                              • Operating temperature: 0°C ~ +60°C indoor cabinet use
                                                              • Front LED indicators for module run status and channel fault alarms
                                                              • Supports open-loop detection for broken transmitter wiring

                                                              Key Functions

                                                              1. Analog signal acquisition
                                                                  
                                                                 Receive 4–20mA signals from field transmitters and convert them into digital engineering values for PLC logic processing.
                                                              2. Circuit isolation protection
                                                                  
                                                                 Isolate noisy field loop circuits from the backplane bus to avoid surge interference damaging the CPU and other modules.
                                                              3. Broken wire diagnosis
                                                                  
                                                                 Automatically detect open current loops (transmitter power loss or cable break) and trigger fault flags for HMI alarm prompts.
                                                              4. Scaling configuration
                                                                  
                                                                 Users set high/low engineering range via programming software; the module converts raw digital values into actual physical units (bar, m³/h, °C).
                                                              5. Multi-point stable sampling
                                                                  
                                                                 Continuous signal averaging filtering reduces data fluctuation caused by field electrical noise, improving measurement accuracy.

                                                              Compatible Equipment

                                                              • RX3i backplanes IC695CHS007 / IC695CHS012, Series 90-30 racks
                                                              • RX3i CPU series IC695CPE305 / IC695CPE305BGAE
                                                              • IC695PSD140 rack power supply
                                                              • Proficy Machine Edition programming software
                                                              • 4–20mA pressure, flow, temperature and level transmitters

                                                              Applications

                                                              Process industrial analog signal collection:
                                                              • Petrochemical production parameter monitoring
                                                              • Thermal power plant auxiliary system measurement racks
                                                              • Water treatment flow & liquid level control panels
                                                              • Factory HVAC and boiler temperature monitoring systems

The structure and details of the product：