If you want to be fully precise for Siemens compatibility checks, you might need:

Final verdict: Your original is fine for informal use, but for professional technical writing, use "SIMATIC PCS 7 V7.1 SP1" (caps, spaces).

If you are planning to leave v7.1 SP1 behind, Siemens offers several upgrade paths. A direct in-place upgrade to PCS7 V9.x or V10.x is impossible. You have three options:

1. For official reporting or resumes (Siemens standard format):

SIMATIC PCS 7 V7.1 SP1 (adds space after "PCS", capitalizes V)

2. For SEO, support tickets, or Google search:

SIMATIC PCS 7 version 7.1 Service Pack 1 (spells out keywords)

3. For a filename or database tag (no spaces, no dots):

SIMATIC_PCS7_V7.1_SP1 or SIMATIC_PCS7_7.1_SP1

4. For a user interface label or short note:

PCS 7 v7.1 SP1 (drops "Simatic" if context is clear)

While v7.1 introduced the initial features, SP1 was released to address early adoption issues and align the software with new Microsoft operating systems.