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S7-1200 firmware mismatch: why the download stops and how to fix it

September 14, 2026 by PLC System

Two cases side by side: a project configured V4.4 against a CPU running V2.2 where the download is refused, and a project configured V4.5 against a CPU running V4.6 where the download runs, with the three remedies listed as change device version, change device and firmware update

TIA Portal refuses the load because the CPU firmware is lower than the configured version. Read the real numbers, then pick the fix.

Categories PLC & HMI Tags change device version, firmware update, S7-1200, spare parts, tia portal

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