GE IC694ALG222
GE IC694ALG222
GE IC694ALG222
GE IC694ALG222
GE IC694ALG222

GE IC694ALG222 | 16-Ch High-Density Voltage Input for RX3i – Field Notes

  • Model: IC694ALG222
  • Alt. P/N: None (single revision)
  • Product Series: PACSystems RX3i (formerly GE Fanuc, now Emerson Automation)
  • Hardware Type: High-density analog voltage input module
  • Key Feature: 16 single-ended OR 8 differential channels in one slot—wire it your way
  • Primary Field Use: Reads DC voltage signals from positioners, drives, and transmitters in process control loops
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Part number: GE IC694ALG222
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Description

Hard-Numbers: Technical Specifications

  • Input Channels: 16 single-ended OR 8 differential (software-configurable)
  • Voltage Range: 0 to +10V (unipolar) / -10V to +10V (bipolar)
  • Resolution: 12-bit; 2.5mV/count (0-10V) / 5mV/count (±10V)
  • Update Rate: 6ms (all 16 SE channels) / 3ms (all 8 diff channels)
  • Accuracy: ±0.25% of full scale @ 25°C (77°F)
  • Input Impedance: >500kΩ (single-ended mode)
  • Isolation Rating: 250VAC continuous / 1500VAC for 1 minute (field-to-backplane, optical)
  • Cross-Channel Rejection: >80dB
  • Input Filter: 41Hz (single-ended) / 82Hz (differential)
  • Operating Temperature: 0°C to +60°C (32°F to 140°F)
  • Power Draw: 112mA @ +5VDC (backplane) + 41mA @ +24VDC isolated (external supply required for main rack)
  • Hot Swap: Yes—module can be replaced under power
  • Certifications: UL, CE, ATEX, Class I Div 2, marine (ABS, BV, DNV, GL, LR)
GE IC694ALG222

GE IC694ALG222

The Real-World Problem It Solves

You’ve got a dozen position feedback signals from valve actuators, drive speed references, and level transmitters—all putting out 0-10V or ±10V. You need them in one rack slot, not three. The ALG222 packs 16 channels into a single-width module, giving you density without sacrificing isolation.

Where you’ll typically find it:

  • Turbine governor systems reading LVDT position feedback (±10V bipolar)
  • Paper machine drive stands monitoring speed reference voltages (0-10V)
  • Process skids with multiple voltage-output transmitters in tight panel space

Bottom line: Maximum channel count in minimum rack real estate—if your signals are clean enough for single-ended wiring, you get 16 points per card.

 

Hardware Architecture & Under-the-Hood Logic

The ALG222 sits on the RX3i backplane as an intelligent I/O module with its own A/D conversion circuitry. It does not have an onboard microprocessor for autonomous processing—all configuration and scaling happens in the CPU. The module uses a multiplexed architecture: all channels share a single A/D converter, which is why the scan time increases with channel count.

Signal path step-by-step:

  1. Field wiring terminates at a 20-screw terminal block (included). Each input connects to a dedicated analog front-end with overvoltage protection.
  2. Input signal passes through a passive RC filter (41Hz cutoff for SE, 82Hz for diff) to knock down high-frequency noise before sampling.
  3. A multiplexer selects one channel at a time and routes it to the 12-bit successive-approximation ADC. Conversion takes roughly 0.4ms per channel.
  4. Optical isolation sits between field side and backplane logic—1500VAC for one minute is the test spec, 250VAC continuous is the working limit. No channel-to-channel isolation; all inputs share a common reference in SE mode.
  5. Digital value is written to the backplane via the serial bus. The CPU reads it on the next scan.
GE IC694ALG222

GE IC694ALG222

Field Service Pitfalls: What Rookies Get Wrong

Wiring Mode Trap: Single-Ended vs. DifferentialThe module gives you 16 channels OR 8 channels—not both. Rookies wire up 16 signals in single-ended mode, then wonder why they’re picking up VFD hash. Single-ended references all signals to a common ground at the module. If your field devices have different ground potentials, you get ground loops. Differential mode uses two wires per signal and rejects common-mode noise, but it halves your channel count.

  • Field Rule: Use differential for any signal running more than 10 meters, near VFDs, or in electrically noisy areas. Single-ended is fine for short, clean runs inside a cabinet.

External 24VDC Power RequirementThis module needs isolated +24VDC to power its field-side circuitry. If you plug it into a Universal Backplane (main rack), it won’t power up without an external supply connected to TB1 on the left side of the backplane. Expansion racks have built-in 24V supplies. I’ve seen guys swap modules into the main rack and stare at a dark “Module P/S” LED for an hour.

  • Quick Fix: Check where the module lives. Main rack = external 24VDC. Expansion rack = backplane supply. The LED tells you—Module P/S should be solid green.

No Channel-to-Channel IsolationThe isolation is field-to-backplane only. All 16 inputs share a common internal ground in single-ended mode. If you short one input to 24V, you can damage the entire input stage. If you’re mixing 4-20mA loops (current) with voltage inputs, don’t—this module is voltage-only. ALG221/223 are for current.

  • Field Rule: Never mix signal types on the same card. If one channel smokes, the whole module is suspect.

 

Commercial Availability & Pricing Note

Please note: The listed price is for reference only and is not binding. Final pricing and terms are subject to negotiation based on current market conditions and availability.

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