GE IC693CPU331T: High-Performance Modular CPU for Series 90-30 PLC

Core Processing Capabilities

The GE IC693CPU331T executes ladder logic and control programs for automation systems. This modular CPU features a built-in floating-point math coprocessor for complex calculations. It manages local I/O and communicates with remote racks seamlessly. Consequently, the module delivers reliable control for mid-size industrial applications.

Physical Dimensions and Board Layout

This modular CPU measures 140 mm in total length. Its width reaches 115 mm for a single-slot form factor. The board thickness stands at 30 mm including all component heights. You will find 456 discrete components on this six-layer PCB. These include a main processor, memory ICs, and communication controllers. The GE IC693CPU331T weighs approximately 340 grams for secure mounting.

Processor and Memory Configuration

The GE IC693CPU331T houses a 16-bit 80C186 microprocessor running at 10 MHz. A dedicated 80C187 math coprocessor accelerates floating-point operations. The CPU contains 32 KB of flash memory for firmware storage. It also includes 16 KB of battery-backed RAM for program and data retention. A replaceable lithium battery preserves this memory during power loss. The battery provides a typical retention period of one year.

I/O Capacity and Scan Performance

This modular CPU supports up to 256 local I/O points directly. It also handles up to 1,024 additional remote I/O points via expansion. The typical scan rate reaches 0.5 milliseconds per kilobyte of logic. The CPU stores up to 16 KB of user ladder logic program. It also holds 512 timers, 512 counters, and 2,048 internal coils. The module supports up to 128 analog I/O words for process applications.

Communication Ports and Interfaces

The GE IC693CPU331T offers one RS-232 port for programming and debugging. It also provides one RS-485 port for serial device networking. Furthermore, the module includes a 15-pin D-sub connector for the programmer interface. A dedicated expansion port supports rack-to-rack communication with a cable. Four status LEDs indicate power, run, fault, and communication activity.

Built-in Functions and Features

This modular CPU includes a real-time clock with battery backup. The clock enables time-stamped event logging and scheduled tasks. The CPU also features a watchdog timer for system safety monitoring. Auto-location of I/O modules simplifies system configuration. The module supports interrupt inputs for high-speed event response. A built-in key switch selects RUN, STOP, or PROGRAM modes securely.

Energy Storage and Power Requirements

The GE IC693CPU331T draws 420 mA from a 5 V DC logic supply. It also requires 30 mA from a 24 V DC field supply. The board incorporates six 47 µF tantalum capacitors for power decoupling. Total stored energy reaches approximately 0.05 joules at nominal voltage. The module dissipates 2.4 W of heat during normal operation.

Installation and Programming Notes

You must install this CPU in the first slot of a Series 90-30 rack. Always replace the lithium battery during scheduled maintenance every 10 months. Then, connect the programming cable to the RS-232 port for configuration. The module supports GE Proficy Machine Edition software for ladder logic development. Regular program backups prevent data loss during unexpected power outages.