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Adding Status Signals to Status Words (Telegram 110, PZD 12/7)

You're encountering an error when assigning status signals to reserved bits in the status words with Telegram 110 and PZD 12/7 because these bits are often protected or have specific functions. Directly modifying them can lead to communication issues.

Adding further signals typically involves utilizing unused bits within the status word or employing additional status words if available. However, with Telegram 110, the options are limited.

Here's how to proceed:

1. Check for Unused Bits: Carefully review the Telegram 110 documentation (available on SiePortal) to identify any truly unused bits within the PZD 12/7 structure.
2. Consider Additional PZD: If possible, explore using additional Process Data Zones (PZD) for status signals. This is often the preferred method if your application requires more signals than can fit within the existing status word.
3. Custom Telegrams (Advanced): Creating a custom telegram is possible but complex. It requires significant engineering effort and compatibility considerations.

Important Note: Modifying telegram structures requires thorough testing and understanding of the communication protocols involved. Incorrect configuration can disrupt communication between your devices.

For detailed information and examples, please refer to the Siemens documentation on SiePortal and search for "Telegram 110 PZD configuration".