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Vendor Knowledge Center
Siemens
S7 controllers, TIA Portal, SINAMICS drives, and PROFINET ecosystems.
Vendor libraries
Siemens S7-1200
Compact controller: onboard I/O, signal boards, and sizing limits.
Siemens S7-1500
Modular high-end controller: performance, diagnostics, and fail-safe options.
Siemens S7 Communication
PUT/GET, ISO-on-TCP (port 102), and data exchange between Siemens CPUs.
Field cases
- S7-1200 BF after CPU swapPLC
BF flashing and unreachable remote I/O after a CPU replacement — device name lives on the device.
- S7-1500 cycle watchdog from SCL loopPLC
Intermittent cycle-time watchdog trips traced to an unbounded SCL loop over a growing recipe array.