GE Fanuc IC698CRE020 Retrofit-Compatible CPU for Legacy Systems

GE Fanuc IC698CRE020 Retrofit-Compatible CPU for Legacy Systems

The GE Fanuc IC698CRE020 is a high-performance CPU module designed for the Series 90-70 programmable logic controller platform — one of the most widely deployed industrial control architectures in process manufacturing, power generation, automotive assembly, and discrete production environments. As original equipment manufacturers phase out support for legacy Series 90-70 hardware, the IC698CRE020 has become a critical retrofit and replacement component for facilities seeking to extend the operational life of their existing control infrastructure without committing to a full platform migration.

At NINERMAS, we maintain verified in-stock inventory of the IC698CRE020 to support urgent replacement scenarios, planned system upgrades, and long-term spare parts programs. Every unit is subject to pre-shipment functional testing, and all orders are covered by a 12-month warranty from the date of delivery.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

Replacing a CPU module in an active production environment requires careful pre-engineering to avoid unplanned downtime and configuration loss. When planning an IC698CRE020 retrofit, the first step is a full audit of the existing rack assembly. In a typical Series 90-70 control cabinet, the CPU slot is flanked by a mix of analog and digital I/O modules — commonly IC697MDL340 discrete input modules, IC697MDL341 discrete output modules, and IC698ALG230 analog input modules — all of which remain fully compatible with the IC698CRE020 and do not need to be replaced during the CPU upgrade.

Power budget verification is essential before proceeding. The IC698PWR101 power supply module, which is standard in most Series 90-70 racks, provides sufficient capacity for the IC698CRE020 CPU alongside a fully populated I/O rack. However, if the existing installation uses an older IC697PWR711 supply, engineers should calculate the total current draw across all installed modules and confirm that the supply’s 5 VDC and 24 VDC rails are not operating near their rated limits. Upgrading the power supply in parallel with the CPU replacement is a common and recommended practice.

Communication architecture is another critical planning area. Many legacy Series 90-70 installations rely on serial communication links — RS-232 or RS-485 — to connect the PLC to upstream SCADA systems, historian servers, or remote I/O drops. The IC698CRE020 supports both serial and Ethernet communication natively. For sites migrating from serial to Ethernet-based supervisory control, the addition of an IC698ETM001 Ethernet TCP/IP module enables seamless integration with modern DCS platforms and OPC-UA servers without requiring changes to the existing I/O wiring or field instrumentation.

Backplane and rack integrity should be inspected during the replacement window. The IC698 series backplane connector is a high-density bus interface, and any corrosion, bent pins, or contamination on the backplane can cause intermittent faults after the new CPU is installed. Cleaning the backplane with appropriate contact cleaner and inspecting the rack for physical damage is a low-cost step that significantly reduces post-installation troubleshooting time.

For sites that use GE Proficy iFIX or Cimplicity as their HMI platform, the CPU replacement process should include a review of all HMI tag bindings. The IC698CRE020 uses the same register address space as its predecessors, so most tag mappings will transfer without modification. However, if the legacy CPU was running a custom communication driver or a non-standard OPC configuration, the HMI engineering team should validate all critical process variable displays — particularly those tied to safety interlocks, alarm setpoints, and production counters — before returning the system to automatic operation.

Programming cable access is required during commissioning. The IC698CRE020 supports programming via the built-in Ethernet port using Proficy Machine Edition, eliminating the need for a dedicated IC690ACC901 serial programming cable in most modern retrofit scenarios. However, for sites without an established Ethernet infrastructure in the control room, a temporary programming connection via the CPU’s serial port remains a reliable fallback option.

Signal isolation should be reviewed for any analog I/O channels connected to field transmitters operating in electrically noisy environments. Where the existing installation uses IC698ALG230 or IC698ALG440 analog modules without external signal conditioners, the retrofit plan should assess whether adding DIN-rail-mounted signal isolators between the field wiring and the module terminals is warranted — particularly in applications involving variable-frequency drives, large motor starters, or welding equipment in the same panel or adjacent enclosures.

Downtime Control During System Migration

Minimizing production interruption during a CPU replacement is the primary concern for most maintenance and engineering teams. The IC698CRE020 retrofit process is designed to be executed within a single planned maintenance window, typically four to eight hours for a well-prepared team, including pre-staging, physical swap, program download, I/O verification, and return-to-service testing.

Before the maintenance window begins, the existing CPU program should be uploaded and archived using Proficy Machine Edition. This backup preserves the complete ladder logic, function block diagrams, data tables, PID configurations, and communication parameters. Storing this backup in at least two separate locations — a local engineering workstation and a network file server — ensures that the original program logic can be restored immediately if the new CPU encounters an unexpected compatibility issue during commissioning.

During the physical swap, the rack should be powered down in a controlled sequence: first isolating field power to output modules to prevent unintended actuator movement, then removing control power from the rack. The IC698CRE020 is installed in the same slot as the outgoing CPU, and all existing I/O module wiring, terminal block connections, and communication cables remain undisturbed. This is one of the key advantages of a same-platform CPU upgrade — the field wiring does not need to be re-terminated, which eliminates a major source of commissioning errors and significantly reduces the time required to return the system to service.

After the new CPU is seated and the rack is powered up, the program is downloaded from the engineering workstation. The IC698CRE020 performs an automatic I/O configuration scan on first power-up, identifying all modules present in the rack and comparing them against the stored hardware configuration. Any discrepancies — such as a module installed in a different slot than the configuration expects — will generate a fault that must be cleared before the CPU transitions to RUN mode. Resolving these faults typically requires only a configuration update in Proficy ME and a second program download, adding no more than 30 minutes to the commissioning timeline in most cases.

Final return-to-service testing should include a structured I/O checkout: forcing each discrete output channel individually, verifying analog input readings against calibrated reference signals, and confirming that all communication links — including any Modbus RTU, Ethernet/IP, or SRTP connections to remote devices — are active and exchanging data correctly. Once the I/O checkout is complete and all process variables are displaying correctly on the HMI, the system can be returned to automatic control.

Retrofit Support FAQ

Q: Is the IC698CRE020 a direct drop-in replacement for older Series 90-70 CPU modules such as the IC697CPU772 or IC698CPE010?
A: The IC698CRE020 is mechanically compatible with the Series 90-70 rack and electrically compatible with the Series 90-70 I/O bus. However, it is not a firmware-identical replacement for all legacy CPU models. Program conversion using Proficy Machine Edition is required when migrating from Logicmaster 90 or VersaPro-based programs. Our technical team can advise on the specific conversion steps for your existing CPU model and software version.

Q: What pre-shipment testing is performed on the IC698CRE020 before delivery?
A: Every IC698CRE020 unit shipped by NINERMAS undergoes functional power-on testing, communication port verification, and firmware version confirmation prior to dispatch. Units are shipped with original or equivalent protective packaging to prevent ESD damage and physical shock during transit. A test report is available upon request for critical infrastructure applications.

Q: Can the IC698CRE020 be used with existing Series 90-70 I/O wiring and terminal blocks without re-termination?
A: Yes. Because the IC698CRE020 operates on the same Series 90-70 backplane bus as its predecessors, all existing I/O module wiring, terminal block assignments, and field cable connections remain valid. No re-termination of field wiring is required for a CPU-only replacement. Changes to wiring are only necessary if the retrofit scope includes adding new I/O modules or expanding the rack configuration.

Q: What does the 12-month warranty cover, and how is a warranty claim processed?
A: The 12-month warranty covers manufacturing defects and functional failures under normal operating and storage conditions from the date of shipment. It does not cover damage resulting from incorrect installation, overvoltage events, physical impact, or unauthorized modification. To initiate a warranty claim, contact NINERMAS at sale@ninermas.com with your order reference number and a description of the fault. Replacement units are dispatched within 3–5 business days of claim approval.