Simatic Pcs7 V7.1 Sp1 2021 -

SIMATIC PCS 7 v7.1 SP1 is designed to integrate all automation levels—from the field level to the management level—into a single, cohesive environment. Unlike standard PLC systems that use Step 7 for discrete logic, PCS 7 utilizes a "completely integrated" approach centered around: Primary reliance on the robust S7-400 CPU series.

Supports up to 150,000 signals/alarms per OS Single Station or Server. Industrial Workstations: Simatic PCS7 v7.1 SP1

The release of Service Pack 1 for version 7.1 brought several stability and functionality improvements aimed at reducing engineering costs and increasing plant safety: SIMATIC PCS 7 v7

If you are currently running V7.1 SP1, you are likely in the "Sustain" phase of the lifecycle. Siemens recommends a migration path, but it requires planning. Industrial Workstations: The release of Service Pack 1

Searching forums like Siemens Industry Online Support will reveal a stark truth: Do not run v7.1 without SP1.