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Modules: Input/output elements housed in a casing, compatible with the PCD1/2 system.
Module holders: Devices such as CPUs, RIOs, or LIOs, to which modules can be attached.
Overview Section
SAIA PCD3.W325｜Programmable Logic Controller｜
1. Processor & Memory
CPU: 32-bit high-performance processor, ~200 MHz, supports real-time multitasking with configurable task priorities
Program Memory (Flash): 16 MB for control programs and parameter files; non-volatile storage prevents data loss during power failure
Data Memory (RAM): 8 MB for temporary data and operation caching; supports battery backup for data retention during power outages
2. Input/Output (I/O)
Onboard I/O: None
Expansion: Requires PCD3 series expansion modules (digital I/O, analog I/O, special function modules). Maximum expansion capacity depends on bus load
Supported Expansion Modules:
Digital I/O (e.g., PCD3.D120, PCD3.O120)
Analog modules (e.g., PCD3.A21, PCD3.AO21)
Special function modules (counters, encoders, PID control, etc.)
3. Communication Interfaces
Standard Ports: 2 × RS-485 (supports Modbus RTU and SAIA PCD proprietary protocols)
Optional Ports: Ethernet interfaces (supports Modbus TCP, Profinet, and other industrial protocols)
Network Integration: Easy connection to factory automation networks (SCADA, MES) and industrial communication systems
4. Power Supply & Electrical
Voltage: 24 V DC (range 18–32 V DC), wide voltage input with strong anti-interference capability
Power Reliability: Supports industrial voltage fluctuations; integrated hardware watchdog automatically restarts the system after failures
5. Environmental & Mechanical
Operating Temperature: 0–60 °C (non-condensing)
Humidity: 5–95 % RH (non-condensing)
Protection Level: IP20; designed for installation inside control cabinets
6. Software & Programming
Programming Environment: SAIA PG5 (version 2.3 or above)
Supported Languages: IEC 61131-3 compliant — Ladder Diagram (LD), Function Block Diagram (FBD), Structured Text (ST), etc.
Features:
Online monitoring and program modification
Hot-plug support for compatible expansion modules (no power-down required)
Easy debugging and maintenance with user-friendly interface
7. Reliability & Industrial Design
Components: Industrial-grade, wide temperature and voltage operation, EMC compliant (EN 61000-6-2)
Watchdog: Built-in hardware watchdog automatically recovers from program errors or system failures
Flexibility: Fully compatible with all SAIA PCD3 expansion modules; scalable I/O and functions to match site requirements
SAIA PCD3.W325｜Programmable Logic Controller｜
By structuring the information in this manner, the article provides a clear and organized understanding of input channels, transducer supply, and communication implementations in distributed control systems.
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