Siemens SINAMICS G120 Drive
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Feb 02, 2026 12:42 pm
can anyone elaborate the differences between PZD and PKW telegrams used in Drive Communication ?
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Feb 03, 2026 6:12 am
In Siemens drive communication, telegrams are divided into two distinct functional areas:
- PZD (Process Data) and
- PKW (Parameter ID Value).
They differ primarily in their timing, purpose, and structure.
Core Differences
| Feature | PZD (Prozessdaten) | PKW (Parameter-Kenn-Wert) |
|---|---|---|
| Purpose | Control and monitoring of the drive in real-time. | Reading and writing drive parameters (e.g., motor data, ramp times). |
| Transmission | Cyclic: Data is exchanged automatically in every bus cycle. | Acyclic (on-demand): Data is transmitted only when requested by the PLC program. |
| Typical Data | Control Word (STW), Status Word (ZSW), Speed Setpoint, Actual Speed. | Parameter numbers and their corresponding values (e.g., P1082). |
| Data Size | Variable, depending on the Standard Telegram selected (e.g., 2, 6, or 12 words). | Fixed size of 4 words (8 bytes). |
| Performance | High speed and deterministic; vital for stable process control. | Slower; may take several PLC cycles to complete one read/write task. |
