Schneider Electric 140CPU43412A – Modicon Quantum PLC Processor Module | Quantum Automation Platform
Engineering Background: The Schneider Electric Modicon Quantum platform is one of the most widely deployed high-availability PLC architectures in heavy industry. Designed for mission-critical process control, the Quantum rack-based system supports hot-standby redundancy, distributed I/O over Modbus Plus and Ethernet, and deterministic scan-cycle execution — making it the backbone of safety-instrumented and continuous-process environments across petrochemical, power generation, and water infrastructure sectors. The 140CPU43412A occupies the central processing role within this architecture: it executes the application program, manages I/O scanning, handles communication scheduling, and arbitrates memory access across all rack-mounted modules.
Product Positioning: The 140CPU43412A sits in the mid-to-upper tier of the Quantum CPU family, positioned above entry-level units such as the 140CPU11302 and below the high-end 140CPU67160 redundancy-optimized processors. Its 512 KB user memory and dual-port Ethernet capability make it the preferred choice for standalone or moderately complex distributed architectures where full hot-standby redundancy is not required but network connectivity and program capacity are critical. It is not suited for SIL-rated safety loops without supplementary safety modules, and it does not natively support Profibus DP master without an additional NOE/NOM communication module.
Complete Technical Specifications
Electrical
- Supply Voltage: 5 VDC (backplane-supplied via Quantum rack)
- Power Consumption: ≤ 3.5 W (backplane)
- User Memory: 512 KB (application program + data)
- Executive Memory: Flash EPROM (non-volatile, battery-independent for program retention)
- Battery Backup: Lithium battery for RAM data retention (replaceable)
- Communication Ports: 1 × Modbus RS-232/RS-485 (Modbus RTU/ASCII), 1 × Modbus Plus (1 Mbps token-passing), 1 × 10/100 Mbps Ethernet (Modbus TCP/IP)
- Max I/O Points: Up to 64,000 discrete / 4,000 analog (system-level, rack-dependent)
- Scan Time: Configurable; typical 1–10 ms for standard applications
Mechanical
- Form Factor: Single-slot Quantum rack module
- Dimensions: 26.9 mm (W) × 149 mm (H) × 120 mm (D) (approximate)
- Weight: ~650 g
- Mounting: Quantum backplane slot 1 (CPU slot)
- Front Panel: LED status indicators (RUN, ERR, MBP, ETH), RS-232 port, battery compartment
Environmental
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: −40 °C to +85 °C
- Relative Humidity: 5% to 95% non-condensing
- Vibration: IEC 60068-2-6 compliant
- Shock: IEC 60068-2-27 compliant
- Altitude: Up to 2,000 m without derating
- Pollution Degree: 2 (IEC 60664-1)
Certifications
- CE (European Conformity)
- UL Listed (UL 508)
- CSA Certified
- FM Class I, Division 2 (hazardous locations)
- RoHS compliant
Data sourced from Schneider Electric Modicon Quantum Hardware Reference Manual (840 USE 101 00) and product datasheet 140CPU43412A. Specifications subject to revision; verify against current OEM documentation for safety-critical applications.
Proven Application Environments
- Petrochemical Refinery: Crude distillation unit | DCS-PLC hybrid architecture | Continuous 24/7 scan with Modbus TCP supervisory SCADA integration
- Thermal Power Plant: Boiler combustion control system | Multi-rack Quantum configuration | High-speed analog loop control with ±0.1% process accuracy requirement
- Municipal Water Treatment: Pump station automation | Remote I/O over Modbus Plus | Unattended operation with alarm-on-deviation logic
- Offshore Oil & Gas Platform: Wellhead control panel | Vibration and humidity-stressed enclosure | FM Div. 2 compliance mandatory
- Steel Mill: Rolling mill drive coordination | High discrete I/O count (>2,000 points) | Deterministic scan-cycle critical for synchronized motion sequencing
- Pharmaceutical Manufacturing: Batch reactor control | 21 CFR Part 11 audit-trail via SCADA | Validated program version control with Unity Pro project archiving
Engineering Advantages
- For continuous-process environments requiring uninterrupted control, this processor module maintains deterministic scan execution, because its Flash EPROM executive is immune to power-cycle corruption and restores to RUN state without operator intervention.
- For distributed plant architectures spanning multiple buildings or process units, this processor module supports simultaneous Modbus Plus and Ethernet TCP/IP communication, because dual-port connectivity allows peer-to-peer PLC messaging and SCADA polling on independent network segments without bandwidth contention.
- For aging Quantum installations requiring CPU replacement, this processor module provides backward-compatible program execution, because it shares the same Unity Pro / Concept software toolchain and backplane pinout as earlier 140CPU432xx variants, minimizing re-engineering effort.
- For hazardous-area installations classified as Class I Division 2, this processor module carries FM certification, because the module’s internal circuitry meets the energy-limitation requirements for non-incendive equipment in gas-risk zones.
- For applications with large data table requirements, this processor module provides 512 KB user memory, because the expanded address space accommodates complex ladder/FBD programs with extensive register arrays without requiring external memory expansion.
- For maintenance teams operating in remote or unmanned facilities, this processor module supports remote diagnostics via Modbus TCP, because the onboard Ethernet port allows Unity Pro online monitoring and program modification without physical site access.
System Architecture & Signal Flow
Signal Flow: Field sensors/actuators → Quantum I/O modules (140DAI/140DAO/140DDI/140DDO series) → Quantum backplane bus → 140CPU43412A processor (scan, solve, update) → Output modules → Final control elements. Supervisory layer communicates via Modbus TCP (port 502) to SCADA/DCS historian. Peer PLCs exchange data via Modbus Plus global data tables.
Compatible Modules:
- Quantum Racks: 140XBP01600, 140XBP01000, 140XBP00600 — same backplane bus standard
- Power Supplies: 140CPS11100, 140CPS21100 — sized for CPU + I/O module load
- Communication: 140NOE77101 (Ethernet), 140NOM21100 (Modbus Plus) — extend network capability
- Remote I/O Head: 140CRA93100 — extends I/O over Ethernet RIO to remote racks
Substitution Conditions: The 140CPU43412A may be substituted by the 140CPU65150 or 140CPU65160 in applications requiring larger memory (>512 KB) or hot-standby redundancy. Downward substitution to 140CPU43412 (without trailing ‘A’) requires verification of firmware revision compatibility in Unity Pro. Cross-brand substitution is not recommended without full I/O mapping and communication protocol re-validation.
Sourcing & Quality Verification
Units offered through Konmask.com are sourced from authorized industrial distributors, decommissioned OEM-maintained installations, and certified secondary-market channels. Each unit undergoes the following verification process before dispatch:
- Visual Inspection: Enclosure integrity, connector pin condition, label authenticity, and absence of counterfeit indicators (font, hologram, PCB markings)
- Functional Power-On Test: Module inserted into Quantum test rack; RUN LED confirmation, firmware version readout via Unity Pro
- Communication Port Verification: Modbus RTU loopback test on RS-232/485 port; Ethernet ping and Modbus TCP register read on port 502
- Battery & Memory Check: Battery voltage measurement; RAM retention test after 30-minute power-off cycle
Documentation available upon request: Test report, firmware version screenshot, product photos (all six faces), certificate of conformity (where applicable), and decommissioning records for ex-plant units.
Procurement Process
- Inquiry Submission: Submit part number, required quantity, and target delivery date via support@konmask.com or WhatsApp +0086 19859288691. Specify any firmware version or certification requirements at this stage.
- Quotation & Confirmation: A detailed quotation including unit price, lead time, shipping options (DHL/FedEx/sea freight), and payment terms will be issued within 24 hours of inquiry receipt. Stock availability is confirmed at time of quotation.
- Dispatch & Documentation: Orders are packed in anti-static ESD bags with foam-lined cartons. Shipping documentation includes commercial invoice, packing list, and test report. Export compliance documentation (HS code 8537.10) provided for customs clearance.
Technical support is available pre-sale (compatibility verification, firmware guidance, rack configuration review) and post-sale (installation troubleshooting, Unity Pro connectivity assistance). Response time: within 24 hours on business days; urgent cases escalated within 4 hours.
Technical FAQ
Q: Is the 140CPU43412A compatible with Unity Pro XL and the legacy Concept programming environment?
A: The module is fully programmable under Unity Pro (all versions supporting Quantum hardware) and retains backward compatibility with Concept 2.6 XL projects via the Concept-to-Unity migration tool. Verify the target Unity Pro version supports the module’s firmware revision before migration.
Q: Can the 140CPU43412A replace a 140CPU43412 (without the ‘A’ suffix) without hardware changes?
A: In most cases, yes — the ‘A’ suffix denotes a hardware revision with improved EMC performance and updated firmware. The backplane pinout and software interface are identical. However, confirm firmware compatibility in Unity Pro’s hardware catalog before deploying in a validated or safety-adjacent application. A program upload/compare cycle is recommended after substitution.
Q: Is this module suitable for SIL 2 safety applications under IEC 61511?
A: The 140CPU43412A is a standard (non-safety) PLC processor and is not independently certified for SIL 2 or SIL 3 use. For safety-instrumented systems, Schneider Electric’s Modicon M580 Safety or Triconex platforms are the appropriate choice. The 140CPU43412A may coexist in the same facility as a safety PLC but must not execute the safety function itself.
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