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Hardware Differences between S7-1515 and S7-1515T

Hello,

The S7-1515T offers enhanced capabilities compared to the S7-1515, primarily geared towards motion control and communication. Here's a breakdown:

• Independent Axis Control: The S7-1515T features integrated PROFINET interfaces specifically designed for connecting to Siemens drives with integrated safety functionality (e.g., SIMODRIVE HQ). This enables independent axis control without requiring additional hardware. The S7-1515 can achieve similar functionality with add-on modules.
• Speed: Both CPUs have comparable processing speeds, but the S7-1515T's optimized PROFINET communication capabilities can contribute to faster overall system performance in motion control applications.
• Cycle Time: Both offer similar minimum cycle times.
• Memory: As you mentioned, the S7-1515T has larger integrated memory (typically 8MB RAM vs. the S7-1515's 4MB).

Program Execution Time: Generally, the program execution time will be very similar for the same program running on both CPUs, *assuming* the program isn't heavily reliant on PROFINET communication or large data blocks. If your application extensively uses PROFINET for motion control or data exchange, the S7-1515T may show a performance advantage.

For detailed specifications, please refer to the Siemens Industry Mall: Siemens Industry Mall and the S7-1500 documentation. You can find additional information about PROFINET and motion control in the Siemens Support portal: Siemens Support.

Best regards,

Siemens Self Support