Schneider 140CPU53414A PLC Controller
Overview
The 140CPU53414A is a high-performance central processing unit (CPU) module belonging to
Schneider Electric’s Modicon Quantum Automation Series, engineered for large-scale industrial
control applications demanding extensive processing capacity, flexible connectivity, and reliable
operation. As a core component of the Quantum system, it serves as the bus master to manage local,
remote, and distributed I/O architectures, enabling real-time control of complex industrial processes
through programmable logic, timing, sequencing, arithmetic, and coupling functions. It is functionally
consistent with the non-"A" version (140CPU53414) while featuring specific compatibility and
firmware requirements for enhanced deployment flexibility.
Key Functional & Design Features
Processing and Memory Capacity
Equipped with 4 MB SRAM and 64 k words of 984 ladder logic capacity, supporting a maximum IEC
program size of 2.7 MB. It offers reference capabilities for up to 64 k discrete inputs/outputs and 57 k
registers (plus 96 k extended registers), meeting the demands of large-scale, complex control tasks
such as multi-process coordination and high-volume data processing.
I/O Management Capabilities
Local I/O: Handles up to 64 input words and 64 output words, with support for 2 I/O racks (via
backplane expander) to accommodate additional modules.
Remote I/O (RIO): Supports up to 31 remote drops, each with 64 input/output words, enabling
control of geographically distributed equipment via coaxial cabling.
Distributed I/O (DIO): Manages up to 500 input/output words per network (30 in/32 out per node)
over Modbus Plus twisted-pair networks, ideal for decentralized installations.
Communication Interfaces
Features two Modbus (RS-232) serial ports (9-pin D-shell) and one Modbus Plus (RS-485) network
port (9-pin D-shell). It supports bridge mode for seamless data exchange between Modbus and
Modbus Plus devices, and can integrate up to 6 network option modules (NOM/NOE/MMS) to extend
connectivity to Ethernet, Profibus, or other fieldbuses.
Reliability and Diagnostics
Battery Backup: Includes a 3 V lithium battery (1200 mAh, 10-year shelf life) to preserve RAM data
during power-off, with a typical power-off load current of 14 μA (maximum 420 μA).
Built-in Diagnostics: Performs power-up and runtime checks for RAM integrity, executive firmware
checksum, and user logic validity. Front-panel LEDs (Ready, Run, Bat Low, Modbus, Modbus+, Error A,
Mem Prt) provide real-time status visualization, including battery health, communication activity, and
errors.
Operational Flexibility
Adjustable Timing: Software-configurable watchdog timer (250 ms default) and logic solve time of
0.1–0.5 ms per k words, ensuring responsive control of time-critical processes.
Parameter Configuration: Front-panel slide switch enables selection of Modbus communication
parameters (ASCII/RTU/software-configurable modes). Rear-panel rotary switches set Modbus Plus
node and Modbus port addresses (valid range: 1–64). A key switch protects memory from
unauthorized programming changes (Stop/Mem Prt/Start positions).
Industrial Durability
Complies with global industrial standards (UL 508, CSA 22.2-142, CE directives) and operates in harsh
environments: temperature range 0°C–50°C (32°F–122°F), 0–95% non-condensing humidity, and
resistance to vibration (10–57 Hz @ 0.075 mm d.a.; 57–150 Hz @ 1 g) and shock (±15 g peak, 11 ms
half-sine wave).
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