Major increase in OPC UA server/client method capacity.

Summary of Siemens S7-1500 / ET 200 Firmware V4.1.0

General Requirements

• Requires TIA Portal STEP 7 Professional V21+.
• Backward compatibility supported.

Key Enhancements
Hardware & Performance

• Major increase in OPC UA server/client method capacity.
• RTM hour meters increased from 16 → 64 with second-level resolution.

Security & User Management

• Backup/restore possible via UMC-managed central users.
• Temporary account lockout to protect against brute-force attacks.
• IP forwarding now configurable via data transfer.
• Distributor ID added to verify authenticity of GSD files.

IRT, Web & Certificate Improvements

• Cross-project IRT clock synchronization.
• OPC UA Client certificates can be updated via GDS Push.
• Major expansion of system websites (diagnostics, hardware, service data, etc.).

R/H Redundant CPU Features

• Configuration in RUN (CiR): add/change PROFINET IO devices without stopping the system.
• Up to 512 PROFINET IO devices supported.
• Expanded Web Server and Web API functions.
• New TO_Ident for RFID integration.

ET 200SP Enhancements

• Support for new Long-Distance SIMATIC Bus Adapters (up to 20 km).

Motion Control Updates (S7-1500T/TF)

• New functions:

1. Superimposed axes, time-based cam profiles, cam range scaling.
2. Cross-PLC synchronization from firmware V2.7+.

• Expanded kinematics types and interpreter capabilities.
• Improved tracking, kinematics, and debug functionality.

User Experience & Stability Fixes

• Numerous bug fixes preventing DEFECT states.
• More reliable Long-Term Trace, override behavior, and motion profiles.
• Improved startup behavior for ET 200SP.
• Fixes for motion vector, override, synchronization, and transformation errors.

Security

• Updated to OpenSSL V3.5.0.