GE IC693CPU372-AE | Series 90-30 CPU, 10K Word Reg, In Stock

Description

Key Technical Specifications

Product Introduction

Series 90-30 CPUs don’t fail because they’re old; they fail because the lithium backup battery leaked onto the PCB or the flash memory hit its write-cycle limit after 20 years of logging. The IC693CPU372-AE is a mid-range processor in the Series 90-30 family, sitting above the entry-level 363/364 but below the high-memory 374. It provides 30K words of program memory and 10K words of register memory, which is plenty for most packaging, pumping, and skid-level applications that don’t require motion control or massive data buffering.

The IC693CPU372-AE includes a built-in SNP/SNPx/Modbus RTU serial port on the front panel, eliminating the need for a separate CMM or communication module for basic HMI or SCADA connectivity. It supports up to 2048 discrete and 2048 analog I/O points across the Series 90-30 backplane, making it a workhorse for distributed I/O architectures. If your system is running this CPU and it’s still functional, don’t replace it just because it’s discontinued — replace it only when it actually fails or when your application outgrows the 30K program limit.

GE IC693CPU372-AE

QA/QC Transparency SOP

1. Intake & Origin Verification: Every IC693CPU372-AE is inspected for battery corrosion, bent backplane pins, and physical damage. We verify the “-AE” suffix, as earlier revisions (e.g., -A, -B) may have different flash memory capacities or boot ROM versions.
2. Live Functional Testing: The IC693CPU372-AE is mounted on a Series 90-30 test rack with a known-good power supply and I/O module. We download a test program, run it for 1 hour, and verify scan time consistency and watchdog timer operation.
3. Electrical Parameter Tests: Using a Fluke 87V, we verify 5VDC backplane draw (typically 1.8A max), check battery backup circuit voltage, and confirm serial port TX/RX signal integrity with a loopback test.
4. Firmware/Config Verification: The CPU’s firmware version is read via Logicmaster 90 or VersaPro. We verify it matches the target system’s expected version to prevent “CPU Type Mismatch” errors during program download.
5. Final QC & Anti-Static Packaging: Passed units are cleaned, fitted with a fresh lithium battery, and sealed in an ESD bag with desiccant. The IC693CPU372-AE is labeled with test date, firmware version, and pass/fail status.

Field Engineer Gotchas

• Battery Corrosion Kills CPUs: The CR2032 battery holder on the is a known failure point. If the battery leaks, the electrolyte eats through the PCB traces under the holder, causing intermittent memory loss or total CPU death. Solution: Always replace the battery during PM, and inspect the holder for white/green crust. If you see corrosion, the CPU is likely toast — don’t waste time trying to clean it.
• Firmware Version Lock: Series 90-30 CPUs are picky about firmware. If your existing is running V5.10 and you drop in a V6.20 surplus unit, Logicmaster 90 may refuse to download the program or throw a “CPU Configuration Error.” Solution: Always read the firmware version from the old CPU before pulling it. Match the exact version, or be prepared to reconfigure the CPU from scratch.
• Backplane Power Budget: The draws 1.8A from the 5VDC backplane rail. If you’ve got a full rack of high-draw modules (analog I/O, high-speed counters, CMMs), you might be sagging the 5V rail below 4.75V, causing random CPU resets. Solution: Calculate your backplane load before adding modules. I’ve seen techs blame a “bad CPU” when the real problem was an overloaded power supply.
• Serial Port Wiring: The front-panel serial port on the uses a 9-pin D-sub, but the pinout for SNP vs. Modbus RTU is different. Using the wrong cable will get you no communication, and you’ll waste hours blaming the CPU. Solution: Verify the cable pinout against the GFK-0895 manual before connecting.

GE IC693CPU372-AE

Application Scenarios

• Water/Wastewater Lift Stations: The handles pump alternation, level control, and alarm monitoring for remote lift stations, communicating with a central SCADA via the built-in Modbus RTU port.
• Packaging Line Skids: Mid-speed packaging machines use the for conveyor sequencing, sensor logic, and HMI interface, with 30K words providing ample room for recipe management.
• Retrofit Replacements for 363/364: Plants upgrading from entry-level 363/364 CPUs use the to gain extra program memory and faster scan times without migrating to PACSystems.
• Case Study: A food processing plant had a Series 90-30 panel controlling a pasteurizer. The original started losing program memory after power cycles. Diagnostics showed a failing backup battery, but replacing the battery didn’t fix it. Further inspection revealed corrosion under the battery holder had eaten through a trace. A verified surplus with a fresh battery holder was installed, and the system has been stable for 18 months.

FAQ

• The 374 has 60K words of program memory and 20K words of register memory. The has 30K/10K. If your program is under 30K, the 372 is sufficient and cheaper.
• Can I use this with a PACSystems RX3i rack?
  No. The is strictly Series 90-30. RX3i uses IC695 CPUs. The backplane connectors and protocol are incompatible.
• Does this CPU support Ethernet?
  No. The has only a serial port. For Ethernet, you need a CMM (IC693CMM002) or upgrade to an RX3i CPU.
• Is the -AE suffix important?
  Yes. The suffix indicates the revision. Earlier revisions may have different flash memory sizes or boot ROMs. Always match the exact suffix when replacing.
• Can I hot-swap this CPU?
  No. Series 90-30 CPUs are not hot-swappable. Power down the rack, replace the CPU, then restore power.
• What programming software do I need?
  Logicmaster 90 (DOS/Windows 3.1) or VersaPro (Windows). Proficy Machine Edition can also program it, but VersaPro is simpler for Series 90-30.
• Is this CPU still manufactured?
  No. Series 90-30 is discontinued. The is available only through surplus and aftermarket channels.