Schneider 140CPU43412A Processor Module

The Schneider 140CPU43412A serves as the main CPU for Modicon Quantum PLC systems. This processor module executes user logic and manages I/O scanning. You will find it in large-scale process control and critical infrastructure applications. It supports hot-standby redundancy for maximum system availability. Therefore, this unit delivers reliable control for demanding industrial environments.

This module measures 140 mm in height and 40 mm in width. Its depth reaches 130 mm for standard Quantum rack mounting. The unit weighs approximately 0.58 kilograms. It contains one 32-bit processor and 8 MB of RAM. Two PCMCIA slots accept memory expansion cards. Additionally, you get eight status LEDs for diagnostics.

Key Technical Specifications

Parameter	Value
Manufacturer	Schneider Electric
Model	140CPU43412A
Product Type	Processor Module
Processor	32-bit @ 133 MHz
Program Memory	8 MB RAM
Data Memory	8 MB RAM
Scan Time	0.2 ms per 1K logic
I/O Capacity	64,000 discrete, 4,000 analog
PCMCIA Slots	2 (Type 1 or 2)
Redundancy Support	Hot-standby compatible
Height	140 mm
Width	40 mm
Depth	130 mm
Weight	0.58 kg
Status LEDs	8 (RUN, ERR, I/O, COM)
Internal Components	1 CPU, 2 slots, RTC
Energy Storage	≈ 350 µF (capacitive)
Battery	Lithium (user replaceable)
Power Consumption	350 mA @ 5 VDC
Operating Temperature	0°C to +60°C

Internal Architecture and Energy Storage

The Schneider 140CPU43412A stores minimal energy in its power filter. Small capacitors hold approximately 350 microfarads total capacitance. A 32-bit processor runs at 133 MHz for fast logic execution. This CPU handles up to 64,000 discrete I/O points efficiently. Eight MB of battery-backed RAM stores user programs and data. A lithium battery maintains memory during power-down for up to 2 years. Two PCMCIA slots accept memory cards for program backup or firmware updates. The module includes a real-time clock for time-stamped events.

Connection Interfaces and Wiring Details

You will find a 10-pin terminal block on the bottom for external wiring. This block accepts remote I/O communication and auxiliary power connections. Use twisted-pair cable for the remote I/O to drop legs. The Schneider 140CPU43412A also includes two PCMCIA slots on the front. Insert a memory card into slot A for program storage. Insert a second card into slot B for firmware or additional data. Eight LEDs show RUN, ERR, I/O, COM, and battery status. A yellow ERR LED indicates a processor or configuration fault. A green RUN LED lights up when the CPU executes logic normally.

Configuration and Installation Steps

You slide this processor into the leftmost slot of the Quantum rack. First, align the module with the upper and lower card guides. Then, push it firmly until the backplane connector seats completely. Secure the front panel with the two retaining screws. Install the lithium battery before applying power for the first time. The Schneider 140CPU43412A requires Concept or Unity Pro software for configuration. Download your user program into the CPU’s battery-backed RAM. Configure the remote I/O network parameters using the programming software. Insert a PCMCIA memory card for automatic program backup on power-up. Always use the proper keying pins to prevent incorrect module placement.