Saia PCD3M.5340

Core CPU & Memory Parameters

• Main Processing Unit: 32-bit industrial RISC processor
• Program Flash Memory: 1 MB onboard non-volatile flash storage
• Data Retention Memory: 128 kB battery-backed RAM for real-time clock and process data retention
• Memory Expansion Slots: Two M1/M2 flash memory card slots supporting up to 4 GB additional program/data storage
• Real-Time Clock: Onboard precision RTC with 5-year backup battery life

Communication Interfaces

• Onboard Ethernet Port: 10/100 Mbps RJ45 TCP/IP port, Modbus TCP, HTTP web server, FTP file transfer support
• RS-232 PGU Programming Port: D-sub 9 serial port for PG5 programming software connection
• RS-422 / RS-485 Multi-Drop Serial Port: Terminal block serial interface supporting Modbus RTU, Saia S-Bus
• I/O Expansion Bus: Internal cartridge slot backplane for PCD3 series plug-in digital/analog I/O modules

Electrical & Environmental Specifications

• Power Supply Input: 24 VDC nominal control supply, 18–30 VDC wide input range
• Maximum Power Consumption: 4.8 W base CPU unit (without attached I/O cartridges)
• Internal Auxiliary Power Output: Max 600 mA 5 VDC logic supply for I/O modules, 100 mA 24 VDC sensor excitation
• Operating Temperature Range: 0°C to +55°C horizontal DIN rail mounting; 0°C to +40°C vertical cabinet installation
• Storage Temperature Range: -25°C to +70°C
• Relative Humidity: 10%–95% non-condensing
• Mechanical Shock/Vibration Compliance: EN/IEC 61131-2 industrial automation standard (15 g 11 ms shock, 1 g sinusoidal vibration)
• Protection Rating: IP20 cabinet-mounted rating
• Mounting Standard: 35 mm TH35 DIN rail mounting
• Physical Dimensions: 160 mm height × 90 mm width × 60 mm depth
• Net Weight: 0.48 kg

Function Features

1. Cartridge-style hot-pluggable I/O expansion slots allow rapid addition of digital input, digital output, analog measurement, and high-speed counter modules without full PLC power shutdown
2. Native Ethernet web server function enables remote HMI monitoring, program upload/download, and alarm notification via standard web browsers
3. Multi-protocol serial communication support for seamless integration with third-party HVAC sensors, variable frequency drives, and energy power meters
4. Built-in energy management function blocks for power factor monitoring, peak load shaving, and building electrical consumption logging
5. UL94 V0 flame-retardant enclosure material for fire safety compliance in commercial building mechanical rooms
6. Comprehensive system diagnostic logic monitors I/O module communication, supply voltage, RTC battery health, and network connection status with dedicated fault alarm registers
7. PG5 programming software full IEC 61131-3 standard compliance supporting ladder diagram, function block, structured text, and sequential function chart programming languages

Application Scenarios

• Commercial office building HVAC heating, ventilation, air conditioning automation control
• Shopping mall centralized lighting and blind shade energy management systems
• Small municipal wastewater treatment plant pump and valve sequential control
• Packaging machine standalone compact PLC motion and discrete logic control
• Solar photovoltaic power station inverter monitoring and grid interlock logic

Working Principle

Material Composition

• Main Control PCB: FR4 flame-retardant printed circuit board with industrial conformal coating
• Enclosure Housing: UL94 V0 self-extinguishing reinforced polycarbonate plastic
• Communication Hardware: Ethernet PHY transceiver IC, RS-485 differential serial line transceivers
• Memory Components: Industrial-grade flash memory chips, lithium RTC backup battery cell with 5-year service life
• I/O Expansion Connectors: Gold-plated spring contact cartridge slot terminals for vibration-resistant module connection

Structural Features

• Modular segmented front panel layout separating Ethernet RJ45 port, RS-232 D-sub programming port, serial terminal block, and I/O cartridge insertion slots
• Front panel multi-color LED indicators for CPU run state, system fault alarm, Ethernet link activity, serial bus communication, and low RTC battery warning
• Integrated DIN rail spring clip with release lever for tool-free mounting and removal from standard 35 mm mounting rails
• Side-by-side stacking compatible design with minimal 5 mm clearance between adjacent PCD3 CPU units in multi-controller cabinet layouts
• Lockable transparent plastic cartridge slot cover to prevent accidental disconnection of I/O expansion modules during maintenance

Installation Requirements

1. Mount horizontally on DIN rail for full 0°C to +55°C operating temperature range; vertical mounting limits maximum ambient temperature to +40°C
2. Maintain minimum 10 mm vertical clearance above and below the CPU unit for passive heat dissipation airflow
3. Separate 24 VDC power supply wiring and Ethernet/serial communication signal cables by minimum 8 cm inside control cabinets
4. Torque serial and power terminal block wiring screws to 0.6