The **SINUMERIK 828D P (PPU - Panel Processing Unit)** is a compact, panel-based CNC controller manufactured by Siemens. It is designed for standardized milling and turning machines. Unlike modular systems (like the 840D), the 828D integrates the CNC, PLC, and HMI into a single hardware unit. Below is a breakdown of the key electronic components and technical specifications. --- ### 1. Core Hardware Components | Component | Description | | :--- | :--- | | **PPU (Panel Processing Unit)** | The "brain" of the system. It contains the processor, memory, and the interface for the display and operator panel. | | **CF Card Slots** | Used for system software storage, user data (NC programs), and machine archives. | | **NVRAM** | Non-volatile RAM that saves retentive data (like tool offsets and PLC states) during power failure without a battery. | | **Ethernet / RJ45** | High-speed communication for factory networking and remote diagnostics. | | **DRIVE-CLiQ** | The digital interface used to connect the PPU to Sinamics S120/S120 Combi drive systems. | --- ### 2. Physical Interfaces & Ports The back of the 828D PPU features several critical electronic interfaces: * **USB 2.0:** Located on the front for easy file transfer (programs and backups). * **PROFINET (PN):** Used for connecting I/O modules (like the PP 72/48) and peripheral devices. * **DRIVE-CLiQ Ports:** Serial communication for motor feedback and drive control commands. * **RS232 (Optional):** For legacy serial communication. * **X102 Interface:** Typically used for handwheels or basic machine control signals. --- ### 3. Compatible Drive & Motor System The 828D does not work in isolation; it is electronically paired with the **SINAMICS** drive family: 1. **SINAMICS S120 Combi:** A compact "power block" that combines the power supply and multiple motor modules into one unit, ideal for the 828D. 2. **SINAMICS S120 (Modular):** Used for machines requiring more axes or higher power ratings. 3. **1FK7 / 1PH8 Motors:** These motors use the electronic "Electronic Rating Plate," meaning the PPU automatically recognizes the motor parameters via DRIVE-CLiQ. --- ### 4. Technical Specifications (Electronic Performance) | Feature | Specification | | :--- | :--- | | **Processor** | High-performance Intel technology (integrated in PPU) | | **Operating System** | Linux-based real-time OS | | **PLC Type** | Integrated SIMATIC S7-200 based logic | | **Axes Capacity** | Up to 8 axes/spindles (depending on the specific PPU version) | | **Minimum Block Cycle** | ~2 ms (varies by model) | | **Input Voltage** | 24V DC | --- ### 5. I/O Modules (Electronic Expansion) Since the 828D has no onboard digital I/O for machine switches/solenoids, it uses **PP 72/48** (72 inputs / 48 outputs) modules. These are connected via the PROFINET bus and are essential for controlling the coolant, tool changer, and safety interlocks.