140CPU53414 | Schneider Modicon Quantum | Low-End CPU

Schneider Electric 140CPU53414 Modicon Quantum Low-End CPU — 4MB SRAM, 133MHz, 2×Modbus + 1×Modbus Plus

The 140CPU53414 is a low-end CPU module for Schneider Electric's Modicon Quantum automation platform. It features an Intel 586 DX processor at 133 MHz with an on-board math coprocessor, 4 MB SRAM, and supports 2 Modbus (RS-232) ports and 1 Modbus Plus (RS-485) port. The CPU is designed for medium-scale industrial automation with support for local I/O, S908 remote I/O, and distributed I/O networks.

Key Specifications

• Manufacturer: Schneider Electric
• Series: Modicon Quantum
• Type: Low-End CPU Module
• Processor: Intel 586 DX
• Clock Speed: 133 MHz
• Math Coprocessor: Yes, on-board
• Internal Memory (SRAM): 4 MB (2.7 MB user-available after system overhead)
• Discrete I/O Capacity: 64 kbits (any combination)
• Register Capacity: 57 kwords max.
• Extended Register Capacity: 96 kwords
• 984 Ladder Logic Capacity: 64 kwords
• Max IEC Program: 2.5 MB
• Logic Solve Time: 0.1–0.5 ms/K
• Local I/O: Unlimited I/O words, max 2 racks
• S908 Remote I/O: 64 in / 64 out per drop, max 31 remote drops
• Distributed I/O: 1 network (3 with NOM option), 500 in / 500 out per network, max 64 DIO drops
• Ethernet Remote I/O: Not supported
• Communication Ports: 2 × Modbus (RS-232, 9-pin D-shell) + 1 × Modbus Plus (RS-485, 9-pin D-shell)
• Max Option Modules: 6 (NOM, NOC, NOE, PTQ PDP MV1, MMS any combination)
• Bus Current Required: 1250 mA
• Watchdog Timer: 250 ms (software adjustable)
• Key Switch: Yes (memory write protection)
• Battery: 3 V lithium, 1200 mAh
• Battery Shelf Life: 10 years (0.5% loss/year)
• Battery Load @ Power-off: 14 µA typical @ 25°C; 420 µA max @ 60°C
• TOD Clock Accuracy: ±8.0 seconds/day @ 0–60°C
• Operating Temperature: 0°C to 50°C (32°F to 122°F)
• Storage Temperature: -40°C to 85°C
• Weight: 0.85 kg (1.87 lb)
• Programming Software: Concept, ProWORX, Modsoft (IEC 61131-3); upgradable to Unity Pro via OS-Loader
• Hot Standby Support: Yes (requires paired non-A or paired A models)
• CCOTF (Change Config On The Fly): Not supported
• Status: Legacy / Mature product

Versions & Revisions

• 140CPU53414 (Base): Original version, 1.8 A bus current
• 140CPU53414A: Redesigned version with unique flash executive; functionally identical but requires paired A models for Hot Standby; 1.25 A bus current
• 140CPU53414B: Further revision with updated components; functionally identical; 1.25 A bus current; requires paired B models for Hot Standby
• Note: A/B and non-A/B flash executives are not interchangeable

Architecture & Functionality

• Front Panel: LED array, removable hinged door with customer ID label, battery slot, two 3-position slide switches, 1 Modbus port, 1 Modbus Plus port A, 1 Modbus Plus port B
• Slide Switches: Left switch = memory write protect (top=enabled); Right switch = Modbus port comm parameters (top=ASCII 2400bps/Even/7/1, middle=RTU default, bottom=custom)
• Rear Panel: Rotary switches for Modbus Plus network address (1–64)
• LED Indicators: RUN, ERR, I/O, COM, Force, BatL, Modbus, Modbus Plus status
• Memory Protection: Hardware write-protect switch prevents inadvertent program modification
• Modem Support: Modbus port 1 supports full modem interfacing; Modbus port 2 supports RTS/CTS flow control (no modem)

Installation Guide

1. Install the 140CPU53414 into the CPU slot on the Quantum backplane (leftmost slot).
2. Set the Modbus Plus network address via rear panel rotary switches (1–64, unique per network).
3. Configure Modbus port parameters via front panel slide switch (RTU default recommended).
4. Connect Modbus (RS-232) and Modbus Plus (RS-485) cables to the front panel ports.
5. Install the 3V lithium battery (990 XCP 960 00) in the battery slot.
6. Set the memory write-protect switch as required (top position = protected).
7. Power on and verify RUN LED illuminates green.
8. Load program via Concept / ProWORX / Unity Pro software.

FAQ

Q: Is 140CPU53414 part of Modicon M340 series?
A: No. Some sources incorrectly describe it as an M340 CPU with Ethernet/USB/24VDC. The 140CPU53414 is a Modicon Quantum low-end CPU with Modbus/Modbus Plus serial communication, powered from the Quantum backplane (not 24VDC).

Q: What is the difference between 140CPU53414, 53414A, and 53414B?
A: 140CPU53414 is the base version (1.8 A bus current). 140CPU53414A and 53414B are redesigned versions with unique flash executives, lower bus current (1.25 A), and updated components. For Hot Standby, both CPUs must be the same revision (non-A + non-A, or A + A, or B + B).

Q: Does 140CPU53414 support Ethernet?
A: No native Ethernet. The CPU has 2 Modbus (RS-232) and 1 Modbus Plus (RS-485) ports. Ethernet connectivity requires an NOE module (e.g., 140NOE77101) installed in the rack.

Q: What is the maximum I/O capacity?
A: Unlimited local I/O words (max 2 racks), 31 S908 remote drops (64 in/64 out per drop), and 64 DIO drops per network (500 in/500 out per network).

Q: Can I upgrade 140CPU53414 to Unity Pro?
A: Yes. The CPU can be migrated from Concept/ProWORX to Unity Pro by updating the operating system via the OS-Loader tool. The upgraded version is designated 140CPU53414U.

Q: What is the battery replacement procedure?
A: The CPU uses a 3V lithium battery (990 XCP 960 00). Replace with power on to avoid data loss. Battery life is ~10 years at 25°C.

Selection Tips

• Quantum, medium-scale, Modbus/Modbus Plus, 4MB: 140CPU53414
• Quantum, smaller scale, 2MB: 140CPU43412A (Intel 486, 66MHz)
• Quantum, larger scale, Ethernet native: 140CPU65150/65160/67160 (High-End CPUs)
• Always verify: Software compatibility (Concept vs Unity Pro), Hot Standby requirement, and option module count (max 6)
• For Ethernet: Add 140NOE77101 or 140NOC78000 module
• For Hot Standby: Order paired identical revisions (both non-A, both A, or both B)