140CPU43412UC Modicon Quantum CPU | 66 MHz Unity Processor 1056 KB RAM

Schneider Electric 140CPU43412UC: The Brain of Your Quantum System

The Schneider Electric 140CPU43412UC is a high-performance Unity processor for Modicon Quantum racks. It runs at 66 MHz with 1056 KB RAM. Handles 31 remote I/O stations plus distributed I/O. Built for large-scale process control. Conformal coating protects harsh environments.

Why This CPU Outperforms

• 66 MHz processing speed – Boolean exec from 0.12 µs
• 2.49 Kinstructions/ms – mixed Boolean and numerical
• 31.7K remote inputs + 31.7K remote outputs capacity
• 3 communication ports – 1 Modbus Plus, 2 Modbus
• 6 optional modules – Ethernet, Profibus, AS-Interface, Sy/Max
• Conformal coating – Humiseal 1A33 for marine and harsh duty

Technical Specifications (Performance Data)

• Brand: Schneider Electric
• Model: 140CPU43412UC
• Series: Modicon Quantum
• Type: Unity Processor CPU Module
• Clock frequency: 66 MHz
• RAM: 1056 KB internal
• Boolean exec time: 0.12 to 0.585 µs
• Float point exec: 0.1 to 0.27 µs
• Instructions per ms: 2.49 Kinst/ms (65% Boolean/35% numerical)
• Local racks: 2 (up to 26 slots each)
• Remote I/O stations: 31 via S908
• Remote I/O capacity: 31.7K in / 31.7K out
• Distributed I/O: 8K in / 8K out per Modbus Plus
• Distributed stations: 63 per Modbus Plus
• I/O interrupt tasks: 64
• Timer interrupts: 16
• Fast task cycle: 0.2 ms
• Master task cycle: 1 ms
• Power consumption: 1800 mA @ 5 VDC
• Optional modules: 6 (Ethernet, Modbus, Modbus Plus, Profibus DP, Sy/Max)
• Communication ports: 1 Modbus Plus (9-pin D-Sub), 2 Modbus (9-pin D-Sub)
• Max Ethernet connections: 6 TCP/IP
• Key switch: Memory start/stop, memory protection
• Slide switch: ASCII/RTU/Memory selection
• Protective coating: Humiseal 1A33 conformal
• Operating temperature: 0 to 60°C
• Storage temperature: -40 to 85°C
• Certifications: UL, CSA, CE, GOST, Marine, HazLoc
• EAN: 3595863839838

Installation & Setup (15 Minutes)

• 1. Insert CPU into leftmost slot of Quantum rack
• 2. Connect battery for memory backup (included)
• 3. Set key switch to STOP/MEM position
• 4. Power up rack – READY LED lights green
• 5. Download program via Modbus or Ethernet
• 6. Turn key to RUN – system starts
• Unity Pro or Control Expert software required

Where This CPU Dominates

• Large water/wastewater treatment plants
• Oil and gas pipelines with remote I/O
• Power generation balance of plant
• Marine and offshore control systems
• High-speed packaging lines with interrupt inputs
• Multi-rack Quantum systems with distributed I/O

Diagnostics & Status LEDs

• RUN (green): CPU solving logic
• READY (green): Power-up diagnostics passed
• BAT LOW (red): Battery low or missing – replace
• MEM PORT (orange): Memory write-protected
• ERROR A (red): Modbus Plus communication fault
• Modbus LED (green): Activity on Modbus port
• Modbus Plus LED (green): Activity on Modbus Plus
• All LEDs: Visible through front bezel

Frequently Asked Questions (Real Answers)

• What is the difference between 140CPU43412UC and 140CPU43412A?UC version has conformal coating. A version does not. UC is for harsh, wet, or marine environments.
• Can I mix remote and distributed I/O on same CPU?Yes. Use S908 for remote I/O. Use Modbus Plus for distributed I/O. Both run simultaneously.
• How much program memory is actually usable?1056 KB total. After OS and system overhead, approximately 900 KB free for user logic and symbols.
• Battery low LED is on. Can I run without battery?Yes. Program runs. But RAM and real-time clock lose power if CPU powered down. Replace battery with powered CPU.
• What is max distance for remote I/O?S908 remote I/O uses coaxial cable. Max 15.2 km (9.4 miles) with repeaters. Standard single drop 300 m.
• Does this CPU support Ethernet I/O directly?No. Ethernet is for programming and HMI only. Use Profibus or Modbus Plus for distributed I/O.

Buying Guide & Field Experience

• Conformal coating check:Always verify coating presence. UC suffix = coated. Non-UC = uncoated. Uncoated units fail in high humidity.
• Battery replacement rule:Replace every 2 years. Use Schneider 990XTLBAT00. Do not wait for BAT LOW LED. Proactive change avoids program loss.
• Memory backup:Use memory card for program storage. Battery only holds RAM. Card holds program without power.
• Fast task timing:Fast task set to 0.2 ms minimum. Keep code short here. Long loops cause watchdog timeout.
• Spare CPU strategy:Store one 140CPU43412UC per site. Full swap takes 5 minutes. No need to reconfigure I/O.
• Our strong advice:Order with pre-loaded program. We download your logic and test before shipping. Zero field programming. Just RUN.

Package Contents

• 1 x Schneider Electric 140CPU43412UC Unity Processor
• 1 x Battery (990XTLBAT00) pre-installed
• 1 x Memory card holder (card optional)
• 1 x Key switch with 2 keys
• 1 x Product documentation CD
• 1 x Conformal coating inspection certificate
• 1 x Factory test report with execution times

Certifications & Approvals

• UL 508 – Industrial control equipment
• CSA C22.2 No 142 – Canadian standard
• CE – European Union
• GOST – Eurasian customs
• Marine – Lloyd’s Register, DNV, ABS (specific inquiry)
• HazLoc – Class 1 Division 2 hazardous locations

Warranty & Shipping

• Warranty: 12 months from shipment. Full replacement coverage.
• Shipping: Fedex Priority, UPS Express, DHL Express Worldwide
• Processing: Same business day before 15:00 CST
• Packaging: Anti-shock, anti-static, double-boxed with desiccant

Ordering & Contact

• Email: info@oiltechcontrols.com
• WhatsApp: +86 158 8020 0923
• Series info: Modicon Quantum Series

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