Why the 140CPU11304C Still Earns Its Rack Space
If your Modicon Quantum rack is running production, a failed CPU is not an option. The Schneider Electric 140CPU11304C is a rack-mounted CPU module built for exactly that reality: steady logic execution, predictable memory behavior, and communication your existing network already understands.
This is not a general-purpose controller. It is a Quantum-series CPU with 768 KB of RAM, 1 MB+ extended memory, and a 16 K-step program capacity. For engineers maintaining legacy Quantum systems, that combination keeps proven control logic running without a full platform migration.
Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | Schneider Electric |
| Product Line | Modicon Quantum |
| Product Type | CPU Module |
| RAM | 768 KB |
| Extended Memory | 1 MB+ |
| Program Capacity | 16 K steps |
| User Logic Memory | 16 KB |
| Communication Port | 1 x Modbus Plus |
| Serial Ports | 1 x RS232 |
| Communication Speed | Up to 1 Mbps |
| Execution Time (Boolean) | ~0.3 µs |
| Battery-Backed RAM | Yes |
| Watchdog Function | Integrated |
| Mounting Type | Rack-mounted |
| Status LEDs | Run, Fault, I/O, Comm |
What These Specs Mean on the Plant Floor
Execution Speed You Can Plan Around
A Boolean execution time of roughly 0.3 microseconds matters when scan time budgets are tight. Fast logic throughput keeps deterministic control loops responsive, which is why this module suits demanding automation sequences rather than light monitoring tasks.
Memory Built for Real Programs
With 768 KB RAM, 1 MB+ extended memory, and 16 KB of user logic memory, the 140CPU11304C handles substantial ladder and logic programs. The 16 K-step capacity gives you headroom for process interlocks, sequencing, and data handling without constant optimization.
Communications That Fit Existing Networks
The single Modbus Plus port supports communication speeds up to 1 Mbps, giving you fast data transfer across connected devices. A separate RS232 port handles serial communication for programming and peripheral links.
Reliability Features That Protect Uptime
Battery-backed RAM preserves critical data through power interruptions. The integrated watchdog continuously monitors system operation, and status LEDs for Run, Fault, I/O, and Comm give technicians immediate visual diagnostics at the rack.
Where It Fits
Typical deployments include oil and gas process control, water treatment sequencing, and continuous manufacturing lines where Quantum racks are already installed. In each case, the value is straightforward: you keep the existing architecture, avoid a costly platform change, and restore control fast.
Integration Notes
The 140CPU11304C uses Modbus Plus and RS232. Wiring into these networks may require specific cables or connection modules. Confirm cable and gateway requirements with your supplier before commissioning to avoid downtime during installation.
Selection Checklist
Before ordering, verify your rack configuration, required program size, and network type. Confirm the module physically matches your existing Quantum slot layout. If you are unsure which revision suits your system, hands-on technical selection help is available — just ask.
Oil AutoTech supplies ready-to-ship Quantum spares with fast dispatch, worldwide. Please verify current lifecycle status and availability with Oil AutoTech before ordering.
Contact Oil AutoTech today for pricing and availability.
