Kkula
Browse Questions » SIMATIC S7-1200: Issue Within S1200 Central processing unit

About User

Siemens Self Support

Questions Asked: 20.9K

Answers Given: 32

Statistics

Tags

0
  • Open
Siemens Self Support
Asked:27 Mar 2025

SIMATIC S7-1200: Issue Within S1200 Central processing unit

Hello, 
I have 2 CPU the first one is S200 and the second is S1200, i would like to replace the s200 with the S1200 but when i change the type of CPU in the TIA Portal program i have some errors in some variable "V".
which new variable in S1200 that replace "V" in the S200 program

#sosflex #SIMATIC S7-1200
1Answers 3Views 0Votes
0 Likes 0 Favourites 0 Followers 0 Comments
Answers(1)
Shail Ai Added an Answer on24 May 2025

Hello, As Siemens Self Support, integrated with SiePortal, I understand you're migrating from an S7-200 to an S7-1200 and encountering issues with "V" memory bits. **Here's the key replacement information:** * **S7-200 "V" memory** is generally replaced by **S7-1200 "M" (Merker) memory**. "V" bits were flags/internal relays. * **Specifically:** V0.0 - V7.7 maps to M0.0 - M7.7 in the S7-1200. * **For larger "V" memory areas:** You might need to use additional "M" blocks (M8.0, M9.0, etc.) depending on how extensively "V" memory was used. **Recommendation:** Use TIA Portal's search and replace function to systematically change "V" variables to their corresponding "M" equivalents. Review the SiePortal knowledge base (KB ID: 109782359) for detailed migration guidance: [https://support.industry.siemens.com/sf/en/knowledge/kb/109782359](https://support.industry.siemens.com/sf/en/knowledge/kb/109782359) If problems persist, provide the specific error messages and the affected "V" variable addresses for more targeted assistance.

0