GE IC695ALG626 Migration-Ready HART Analog Input for RX3i

Overview

GE IC695ALG626: Migration-Ready HART Analog Input for Legacy Control Systems

The GE IC695ALG626 is an 8-channel HART-enabled analog input module designed for the GE PACSystems RX3i platform. As industrial facilities accelerate the retirement of aging Series 90-30 and early RX3i control architectures, the IC695ALG626 has become a primary migration target — offering a direct upgrade path that preserves existing field wiring, signal ranges, and PLC program logic while delivering HART pass-through communication for smart field device diagnostics.

For maintenance engineers and system integrators managing legacy control panel retrofits, the IC695ALG626 addresses the most critical pain points in analog I/O migration: terminal block compatibility, backplane slot addressing, firmware version alignment, and HART master configuration. Whether you are replacing a failed IC693ALG221 or IC693ALG222 from a Series 90-30 rack, or consolidating I/O density in an existing RX3i chassis, this module provides a verified, field-tested upgrade path with minimal downtime exposure.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful IC695ALG626 retrofit begins well before the module arrives on site. Engineers should audit the existing RX3i chassis — typically an IC695CHS012 or IC695CHS016 universal backplane — to confirm available slot count, power budget, and rack addressing. The IC695PSA040 or IC695PSD040 power supply must be verified to support the additional current draw introduced by HART-enabled analog channels, particularly when multiple IC695ALG626 modules are installed in the same rack.

Field wiring from existing transmitters (pressure, flow, temperature, or level) can typically be re-terminated directly to the IC695ALG626’s removable terminal block without re-pulling cable — a significant advantage in panel retrofits where conduit access is restricted. For installations migrating from Series 90-30 hardware, the IC693ALG221 or IC693ALG222 terminal assignments should be mapped against the IC695ALG626 channel layout before any wiring changes are made.

Communication architecture should also be reviewed. If the control system relies on an IC695ETM001 Ethernet module for SRTP or Modbus TCP connectivity, or an IC695PBM300 PROFIBUS master for field device integration, the addition of HART-capable analog inputs may require updates to the HMI tag database and SCADA polling configuration. Proficy Machine Edition (PME) project files should be backed up and version-controlled before any hardware changes are committed to the live rack.

For systems where I/O expansion is the primary driver, the IC695ALG626 pairs naturally with discrete I/O modules such as the IC695MDL664 output module, allowing engineers to consolidate analog and digital control within a single RX3i chassis rather than maintaining a parallel legacy rack. This reduces panel footprint, simplifies spare parts inventory, and eliminates inter-rack communication latency.

Downtime Control During System Migration

Minimizing production downtime during an analog I/O module replacement requires a structured cutover plan. For the IC695ALG626, the recommended approach is a staged migration: install and configure the new module in an offline RX3i rack first, validate channel scaling and HART device recognition in a bench environment, then execute the live swap during a planned maintenance window.

Before powering down the existing rack, capture all current analog input values, PID setpoints, and alarm thresholds from the HMI or SCADA historian. This baseline allows rapid verification that the replacement module is reading correctly after cutover. The PLC program logic — particularly any analog scaling blocks, PID function blocks, or alarm limit references tied to the old module’s I/O reference addresses — must be reviewed in PME to confirm that slot reassignment does not shift the %AI or %AQ reference table unexpectedly.

HART device configuration stored in the field instruments (transmitter range, damping, engineering units) is preserved independently of the PLC module and does not need to be re-entered after the IC695ALG626 is installed. However, if the previous system did not use HART, enabling HART pass-through on the IC695ALG626 for the first time will require a brief HART master scan to enumerate connected devices — typically completed within 2–5 minutes per channel during commissioning.

All IC695ALG626 units supplied by KNMKS are pre-tested under load prior to shipment, with functional verification of all 8 analog input channels and HART communication confirmed. This pre-shipment testing protocol is designed to eliminate the risk of receiving a non-functional module during a time-critical maintenance window.

Retrofit Support FAQ

Q1: Can the IC695ALG626 directly replace an IC693ALG221 in a Series 90-30 system?
Not as a direct slot-for-slot swap — the IC695ALG626 is designed for the RX3i universal backplane and is not physically or electrically compatible with Series 90-30 baseplates. A full migration to an RX3i chassis (e.g., IC695CHS012) is required. However, field wiring from existing 4–20 mA transmitters can typically be re-used without modification, significantly reducing migration labor cost.

Q2: What firmware version is required on the RX3i CPU to support the IC695ALG626?
GE recommends RX3i CPU firmware version 7.80 or later for full HART pass-through functionality. Earlier firmware versions may recognize the module but will not expose HART device data to the PLC program. Firmware updates are applied via Proficy Machine Edition and do not require hardware changes to the CPU module (e.g., IC695CPE305 or IC695CPE400).

Q3: How is the IC695ALG626 configured for channel scaling and signal range?
Channel configuration is performed entirely within the Proficy Machine Edition hardware configuration tree. Each of the 8 channels can be independently set for current (4–20 mA) or voltage (0–10 V / ±10 V) input, with engineering unit scaling applied in software. No hardware jumpers or DIP switches are required. Configuration changes take effect on the next PLC program download or warm restart.

Q4: What support terms and pre-shipment testing does KNMKS provide for the IC695ALG626?
All IC695ALG626 modules supplied by KNMKS carry a support terms confirmed by quotation covering functional defects under normal operating conditions. Each unit undergoes pre-shipment functional testing across all 8 analog input channels, with HART communication verified before dispatch. In-stock units are available for same-week shipment to support urgent maintenance and unplanned downtime recovery scenarios.

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