1. Compact PLC:- Inbuilt power supply, I/O modules, CPU, Communication Ports.Compact PLCs are characterized by their all-in-one design, incorporating an integrated power supply, CPU, I/O modules, and communication ports within a single unit. They are typically used in applications where space is limited or where a simplified setup is desired.
Example: Siemens SIMATIC S7-1200 series.
2. Modular PLC:- Chassis System, Separate power supply module, CPU Module, I/O modules.Modular PLCs are built on a modular architecture, consisting of separate modules for different functions such as power supply, CPU, and I/O modules. This design offers flexibility in configuration and scalability, allowing users to customize the system according to their specific needs.
Example: Allen-Bradley ControlLogix series.
3. Sidewise:– Nano, micro, medium.Sidewise classification refers to the size or scale of PLCs, categorized into nano, micro, and medium based on their processing power, memory capacity, and I/O capabilities. These categories provide a range of options suitable for different applications, from small-scale projects to larger industrial automation systems.
Example:
Nano: Siemens SIMATIC S7-1200 series (e.g., S7-1200 CPU 1214C).
Micro: Allen-Bradley MicroLogix series (e.g., MicroLogix 1100).
Medium: Siemens SIMATIC S7-300 series (e.g., S7-300 CPU 315-2DP).
