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SAIA PCD3.W350｜Programmable Logic Controller｜
1. Processor and Performance
CPU Model: 32-bit high-performance processor (specific model not disclosed), official nominal speed 1.5 MIPS
Multitasking: Supports concurrent tasks for running complex control programs efficiently
Program Memory: 2 MB built-in Flash for user programs and system configurations; program encryption to prevent unauthorized changes
Data Memory: 512 KB RAM for real-time data caching and variable storage; supports power-down hold with optional external battery module
2. Integrated I/O Interfaces (Built-in)
Ready to use without additional I/O modules. Integrated I/O meets small- and medium-scale control needs:
| I/O Type | Specification |
|---|---|
| Digital Input | 16 points, 24 V DC sinking/sourcing (software-configurable); response time ≤ 1 ms |
| Digital Output | 8 points, 24 V DC transistor output; max 0.5 A/point, total ≤ 4 A; supports PWM pulse output |
| Analog Input | 4 points, 12-bit resolution; 0–10 V DC / 4–20 mA (software-configurable); input impedance ≥ 100 kΩ |
| Analog Output | 2 points, 12-bit resolution; 0–10 V DC / 4–20 mA (software-configurable); load ≤ 500 Ω (voltage), ≤ 600 Ω (current) |
3. Communication Interfaces
Main Port: 1 × RS-485 (supports Modbus RTU and SAIA PCD Link protocols); baud rate up to 115 200 bps; connects to drives, sensors, HMIs, etc.
Programming / Expansion Port: 1 × USB 2.0 for PC programming, data upload/download; supports USB-to-RS-232 adapter for serial expansion
Optional Expansion: Communication modules (Ethernet, Profibus DP, CANopen, etc.) can be added via SAIA PCD dedicated buses (e.g. PCD Bus) for industrial Ethernet or fieldbus needs
SAIA PCD3.W350｜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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