Description
Application Scenario
A cement plant in southern China was struggling with an aging relay-and-984-based control system on its raw-material yard and kiln feed line. The original controller had no redundancy, scan times were creeping up as the recipe logic grew, and the only communication path to the central SCADA room was a slow serial link that dropped data during thunderstorms. The engineering team needed a drop-in processor that could keep the existing Quantum I/O racks, cabling, and instrument loops intact while adding a redundant partner and a modern Ethernet uplink.
They chose the 140CPU53414A as the primary CPU, paired it with an identical “A”-revision unit for hot standby, and added a 140NOE77101 Ethernet module for the SCADA connection. Within a single planned maintenance window, the plant gained bumpless failover, a tenfold improvement in communication reliability, and enough free memory to consolidate the batch-recipe and alarm-history logic that had previously lived on a separate PC. Two years later, the control room reports zero process interruptions caused by the CPU, and the maintenance team carries a tested spare 140CPU53414A on site — a practice that has already paid for itself once during an unplanned battery failure.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 140CPU53414A (suffix “A” = hardware revision; Flash executive not cross-compatible with non-A) |
| Manufacturer | Schneider Electric (Modicon brand) |
| Product Category | PLC Central Processing Unit (CPU) / Processor Module |
| Processor | Intel 80586 DX, 133 MHz, with integrated math coprocessor — accelerates PID, flow totalization, and floating-point loops |
| Internal Memory | 2.7 MB (2,972 KB) SRAM, battery-backed — room for large ladder/FBD programs plus data tables |
| Option Module Interfaces | 6 slots for network/communication modules; up to 2 Modbus Plus modules with full Quantum DIO support |
| Communication Ports | 2 × Modbus RS-232 (programming / HMI / RTU-ASCII) + 1 × Modbus Plus RS-485 at 1 Mbps |
| Ethernet | Not native — add a 140NOE77101 or 140NOE77111 option module for TCP/IP |
| Hot Standby | Supported; up to 128 kB unlocated data synchronized each scan for bumpless failover |
| Watchdog Timer | 250 ms, software-adjustable — forces I/O to a safe state if the program freezes |
| Mode Security | Front-panel physical key switch (RUN / STOP / PROGRAM / MEM PRT) — prevents unauthorized or accidental changes |
| Memory Backup | 3 V lithium battery, 1,200 mAh, ~10-year shelf life; data retention through power loss |
| Power Draw | 5 V DC from Quantum backplane, approx. 1,250 mA (6.25 W typical dissipation) |
| Operating Temperature | 0 °C to +60 °C (32 °F to 140 °F) |
| Storage Temperature | -40 °C to +85 °C |
| Humidity / Altitude | 5 %–95 % non-condensing; up to 5,000 m above sea level |
| Dimensions (H × W × D) | Approx. 250 × 30 × 200 mm (single-slot Quantum module) |
| Weight | 0.91 kg (2.00 lbs) |
| Protection / Mounting | IP20, cabinet-mounted; plugs into dedicated CPU slot of a 140XBP backplane |
| Programming Software | Concept 2.6+ or ProWORX (native); upgradable to Unity Pro via OS-Loader (firmware PV04 minimum) |
| Languages | LD, FBD, SFC, ST, IL per IEC 61131-3 |
| Certifications | CE, UL 508, CSA C22.2 No. 142, FM Class I Div. 2 (revision-dependent) |
| Product Status | Discontinued by manufacturer — supplied as new-surplus, refurbished, or tested spare part |
