GE IC695CRU320CA Migration-Ready Redundant CPU

Overview

GE IC695CRU320CA Migration-Ready Redundant CPU for Legacy Control Systems

The GE IC695CRU320CA is a migration-ready redundant CPU module designed for the GE PACSystems RX3i platform, engineered to serve as a direct replacement for legacy and discontinued control system components including the earlier IC695CRU320 and IC695CRU320B revisions. For facilities operating aging automation infrastructure — whether inherited from legacy Series 90-70 architectures or first-generation RX3i deployments — the IC695CRU320CA provides a validated upgrade path that preserves existing program logic, minimizes downtime, and extends the operational life of installed control cabinets.

This module supports hot-standby redundancy, enabling seamless switchover between primary and secondary CPUs without interrupting process control. It is fully compatible with the IC695RMX128 redundancy memory xchange module and operates within standard RX3i Universal Backplanes such as the IC695CHS016 and IC695CHS012. Engineers migrating from non-redundant single-CPU configurations should verify backplane slot availability and confirm that the IC695PSA140 or IC695PSD140 power supply modules provide sufficient current capacity for the expanded redundant configuration.

Before installation, retrofit planners must audit the following critical parameters: terminal wiring compatibility with existing I/O modules such as the IC694MDL754 discrete output module or IC695ALG600 analog input module; backplane interface revision levels; module addressing within the hardware configuration tool (Proficy Machine Edition); HMI screen tag bindings that reference CPU-resident data blocks; EtherNet/IP and PROFINET communication link assignments; available rack space for the redundancy sync cable; firmware version alignment between primary and secondary CPU units; and field commissioning procedures for bumpless transfer validation.

Communication protocol migration is a key consideration. The IC695CRU320CA supports both EtherNet/IP and PROFINET natively, making it suitable for facilities transitioning from legacy serial-based SRTP or SNP communication links. Where existing HMI panels or SCADA systems rely on older protocol drivers, a communication module such as the IC695ETM001 EtherNet/IP interface may be required to bridge legacy and modern network segments without requiring full HMI replacement.

For I/O expansion during the retrofit, the IC695CRU320CA integrates with RX3i distributed I/O drops over PROFINET, allowing engineers to extend field device connectivity without redesigning the main control cabinet. This is particularly valuable in brownfield projects where physical cabinet space is constrained and adding new local I/O racks is not feasible.

All units supplied by KNMKS are sourced from verified channels, subjected to pre-shipment functional testing, and covered by a support terms confirmed by quotation. Inventory is maintained to support urgent replacement requirements, with same-day dispatch available for in-stock units.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful retrofit begins well before the maintenance window opens. Engineers should extract the full hardware configuration from Proficy Machine Edition and document every module address, I/O map, and communication link currently active in the rack. For systems using the IC695ETM001 for EtherNet/IP connectivity or the IC695PBM300 PROFIBUS master module for legacy field device communication, these modules must be retained in their original backplane slots to avoid address conflicts during the CPU swap.

Power budget verification is essential. The IC695PSA140 power supply module provides 40W of backplane power; adding a redundant CPU pair alongside existing analog modules such as the IC695ALG600 and discrete modules such as the IC694MDL754 may approach this limit. A detailed power consumption audit should be completed before ordering replacement hardware.

Where the existing control cabinet includes a QuickPanel+ HMI or a third-party SCADA terminal communicating via SRTP, engineers should confirm that the IC695CRU320CA’s SRTP server remains enabled in the CPU configuration and that IP address assignments are preserved post-swap. For facilities migrating to PROFINET-based distributed I/O, the IC695CRU320CA’s integrated PROFINET controller eliminates the need for a separate communication module in many configurations, freeing a backplane slot for additional I/O expansion.

Programming cable access via the IC690USB485 or direct USB port on the CPU should be confirmed prior to the maintenance window to ensure that firmware updates and program downloads can be executed without additional hardware procurement delays on-site.

Downtime Control During System Migration

Minimizing unplanned downtime is the primary objective of any redundant CPU migration. Because the IC695CRU320CA supports hot-standby operation, the recommended migration sequence involves installing and commissioning the replacement unit as the secondary CPU while the existing primary remains in control. Once the secondary has synchronized its memory image — confirmed via the redundancy status bits in the CPU data block — a controlled switchover can be initiated, transferring control to the new unit with zero process interruption.

Original program logic stored in flash memory on the legacy IC695CRU320 or IC695CRU320B should be backed up to a project archive in Proficy Machine Edition before any hardware is removed. This archive preserves all rung logic, function block diagrams, variable tables, and hardware configuration settings, providing a complete recovery baseline if the migration encounters unexpected compatibility issues.

Field I/O continuity is maintained throughout the switchover because the IC695CRU320CA retains all I/O module scan cycles during the transition. Analog output modules such as the IC695ALG704 will hold their last commanded values during the brief switchover interval, preventing unintended actuator movement. Discrete output modules will similarly hold state, protecting downstream equipment from spurious commands.

Post-switchover, engineers should validate all communication links — EtherNet/IP connections to remote I/O adapters, PROFINET device assignments, and SRTP sessions to HMI panels — before releasing the system to normal production operation. A structured commissioning checklist covering all 12 validation points (power, firmware, program, I/O scan, communication, HMI, redundancy sync, bumpless transfer, alarm acknowledgment, historian connection, safety interlock, and operator acceptance) is recommended to ensure no step is omitted under time pressure.

Retrofit Support FAQ

Q: Is the IC695CRU320CA a direct replacement for the IC695CRU320 and IC695CRU320B?
A: Yes. The IC695CRU320CA is the current production revision and is a direct drop-in replacement for both the IC695CRU320 and IC695CRU320B in all standard RX3i backplane configurations. No hardware modifications to the rack or wiring are required.

Q: What pre-shipment testing is performed on each unit?
A: Every IC695CRU320CA unit supplied by KNMKS undergoes functional power-on testing, firmware version verification, and communication port validation before dispatch. A test report is available upon request. All units are covered by a support terms confirmed by quotation from the date of shipment.

Q: Do I need to update my Proficy Machine Edition hardware configuration after installing the IC695CRU320CA?
A: In most cases, no configuration change is required if you are replacing an IC695CRU320 or IC695CRU320B with the IC695CRU320CA, as the catalog entry is compatible. However, if your project was created with an older version of Proficy Machine Edition, updating the software to the latest supported release is recommended to ensure full firmware and diagnostic compatibility.

Q: What is the typical lead time and do you maintain stock?
A: KNMKS maintains inventory of the IC695CRU320CA to support urgent replacement requirements. In-stock units are available for same-day dispatch. For large-quantity orders or scheduled maintenance projects, please contact our sales team to confirm availability and arrange priority allocation.

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GE
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IC695CRU320CA
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PLCs & Controllers

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