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Key Technical Specifications
| Parameter | Value |
| Manufacturer | GE Fanuc |
| Part Number | IC693CPU311-AC |
| Hardware Revision | Revision AC (Backward compatible with all earlier IC693CPU311 revisions) |
| Series | Series 90-30 |
| Module Type | Embedded Processor Baseplate |
| Processor Clock Speed | 10 MHz (80188 Microprocessor) |
| User Memory Capacity | 18K Bytes (RAM with battery backup, optional EPROM/EEPROM) |
| I/O Discrete Capacity | 512 Inputs / 512 Outputs |
| Analog Memory | 128 %AI words / 128 %AQ words |
| Baseplate Slots | 5 total slots (1 Power Supply slot + 4 general-purpose I/O slots) |
| Baseplate Expansion | Standalone baseplate (Does NOT support external expansion baseplates) |
| Sweep Speed | 0.4 milliseconds per 1,000 boolean instructions |
| Communication Ports | RS-485 SNP port located on the power supply module |
| Backplane Power Draw | Draws operating power from the plug-in Series 90-30 Power Supply |
Product Introduction & Supply Chain Strategy
The GE Fanuc IC693CPU311-AC is an entry-level processor baseplate unit for Series 90-30 PLCs. Unlike modular CPU designs that plug into a standard slot, the CPU311 features a 10 MHz 80188 processor embedded directly onto a 5-slot baseplate chassis, providing a compact, cost-effective solution for small-scale control systems.
Securing this embedded CPU baseplate as New Surplus provides a critical hedge against unplanned line stoppages. Procuring factory-fresh, uninstalled surplus eliminates the risk of memory corruption, cold solder joints, and battery circuit degradation inherent in second-hand hardware pulled from aged plant installations.
IC693CPU311-AC
IC693CPU311-AC
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
- Perform Lock-Out/Tag-Out (LOTO) procedures on the power feeds supplying the system power supply and connected field I/O devices.
- Wear a grounded anti-static wrist strap during handling to protect embedded processor chips and RAM circuits from ESD damage.
- Take clear photos of existing I/O module slot placements, power supply wiring, and the RAM backup battery orientation before disassembly.
Stage 2: Removal
- Disconnect incoming power connections and remove the power supply module from the leftmost slot.
- Unplug field wiring terminal blocks and extract all I/O cards from slots 1 through 4.
- Loosen the four mounting bolts securing the IC693CPU311 baseplate to the panel enclosure and remove the chassis.
Stage 3: Installation (Clone & Seat)
- Securely mount the replacement IC693CPU311-AC baseplate to the panel using 4 M4 (or #8) screws, ensuring bare-metal earthing contact.
- Install the power supply into the dedicated leftmost slot and re-insert all I/O modules into their original slot locations.
- Connect a fresh lithium RAM backup battery (IC693ACC301) to the power supply battery connector to ensure user program retention upon power-down.
Stage 4: Power-On & Testing
- Reapply power to the power supply module and observe the status LEDs.
- Confirm the “PWR” and “OK” LEDs light solid green, indicating the embedded processor passed its power-on self-test (POST).
- Connect via Proficy Machine Edition or Logicmaster 90 using an RS-485 SNP adapter cable to upload/verify the logic program and verify CPU RUN mode.
Firmware/Software Versions & Upgrade Notes
- Revision Compatibility: The “-AC” suffix represents the physical manufacturing hardware and firmware revision. Revision AC is fully backward-compatible with all earlier IC693CPU311 revisions (such as AA and AB).
- Software Programming: Programmed using Proficy Machine Edition or legacy Logicmaster 90-30 software via the SNP port on the system power supply.
- System Expansion Restrictions: The is an embedded single-rack CPU chassis. It lacks a 25-pin expansion bus port on the right end of the board and cannot be connected to local or remote expansion baseplates. If your application requires expansion racks, upgrade to a modular CPU (such as IC693CPU331 or CPU350) paired with an IC693CHS397 or IC693CHS391 baseplate.
Frequently Asked Questions (FAQ)
Is this -AC unit brand new or a refurbished board?
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability.
Why is buying New Surplus so critical for embedded CPU baseplates?
Embedded CPU baseplates combine controller electronics and physical backplane trace routing on a single printed circuit board. Refurbished or pulled units often suffer from degraded RAM backup circuitry, thermal fatigue on surface-mount processor solder joints, and loose card-edge connector pins. New Surplus guarantees full component lifespan, zero operating hours, and clean memory logic execution.
What testing is conducted on this -AC before shipment?
Every -AC undergoes a complete quality inspection. This includes anti-counterfeit serial checks, backplane connector pin alignment verification, power-on self-test execution, and SNP port communication handshakes in a test environment.
Can I upgrade the memory capac?
The onboard RAM is fixed at 18K Bytes. However, you can install an optional EPROM or EEPROM memory chip into the designated socket on the baseplate board to provide permanent, non-volatile backup for the user program in environments where battery maintenance is difficult.
What happens if the backup battery fails while power is turned off?
If the RAM backup battery dies while primary power is disconnected, the user program and CPU configuration stored in volatile RAM will be lost. Installing an optional EEPROM chip or maintaining a fresh battery replacement schedule prevents program loss.
What warranty coverage is included with this New Surplus processor baseplate?
This unit comes with a full 1-year functional warranty. If any operational defect or hardware failure occurs during normal use within 12 months, we will immediately provide a replacement unit from our active buffer inventory.
