IC694ALG221 IC694ALG221-1 IC694ALG221-2 IC694ALG221 5

The GE IC694ALG221 is a high-performance analog input module engineered for GE Fanuc PACSystems/RX3i and Series legacy PLC environments, offering accurate real-world signal integration into automation logic. With 4 differential current input channels, it converts field sensor signals into precise digital values for process control, machine monitoring, and advanced data acquisition. This module is ideal in applications that require robust industrial signal capture — including pressure transmitters, flow meters, and other 4–20 mA current loop devices.

Technical Specifications

Specification	Details
Module Type	4-Channel Analog Input Module
Compatible PLC Series	GE Fanuc / Emerson PACSystems RX3i and legacy platforms
Number of Channels	4 differential inputs
Input Signal Range	0–20 mA or 4–20 mA (jumper selectable)
Resolution	12-bit (4 µA @ 4–20 mA; 5 µA @ 0–20 mA)
Update Rate	2 ms all channels (0.5 ms/channel each)
Accuracy	±0.1 % full scale + 0.1 % reading
Input Impedance	~250 Ω
Isolation	Field-to-backplane optical isolation
Power Consumption	~25 mA @ 5 VDC backplane; ~100 mA @ isolated +24 VDC
LED Indicator	“Module OK” status LED
Mounting	Standard PLC I/O slot
Dimensions (L×W×H)	85 × 120 × 140 mm
Weight	~0.84 lbs (~0.38 kg)

Recommended Related Modules

GE IC693CPU331 – Core CPU module for rack-based PLC systems
GE IC693DSM314 – High-density discrete output module
GE IC693MDL752 – Standard 16-point digital input module
GE IC693PWR330 – High-capacity power supply module

Popular GE PLC Modules

GE IC693DNM200 – DeviceNet master communication module
GE IC693DNS201 – DeviceNet slave communication module
GE IC693ALG222 – Companion analog input with different configuration
GE IC693ACD001 – Analog conversion/detail module

Applications

The IC694ALG221 analog input module is suited for a broad range of industrial automation use cases, such as:

Process control systems capturing real-time sensor data
Factory automation networks requiring precise current loop measurement
Energy and utility monitoring applications with 4–20 mA sensors
Temperature, pressure, and flow signal integration into PLC logic
Feedback systems for closed-loop control and analytics

With support for differential inputs and fast update rates, it helps automation systems respond quickly and accurately to field changes.

Advantages

Multiple differential inputs support high-accuracy current loop measurements

Fast conversion and update speeds (2 ms total) for responsive control

High resolution and linearity ensure precise signal representation

Optical isolation and robust design enhance noise immunity in harsh environments

Reliable LED diagnostics simplify status verification

Modular I/O form factor integrates seamlessly into PLC racks

This combination makes the IC694ALG221 a reliable choice for both legacy systems and modern PAC architectures where analog signal fidelity matters.

Technical FAQs

What input signal ranges does the IC694ALG221 support?
It supports both 0–20 mA and 4–20 mA current input ranges with jumper configuration.
How many analog channels does it have?
It offers 4 differential input channels.
What resolution does the module provide?
12-bit resolution delivers 4 µA or 5 µA per count accuracy.
Is isolation provided between field signals and the backplane?
Yes — optical isolation improves signal integrity and noise immunity.
What is the typical update rate?
The module has a 2 ms update rate across all four channels.
Does the module draw power from the PLC backplane?
Yes — it consumes power from both the +5 V backplane bus and isolated +24 V supply.
Can the IC694ALG221 be hot-swapped?
No — hot swapping is generally not supported.
What types of sensors can it interface with?
Standard 4–20 mA industrial sensors including transmitters and transducers.
Where is this module used?
In PLC systems that require precise analog current measurements for control and monitoring.
Does it include status LEDs?
Yes — it includes a “Module OK” LED to display operational status.