Siemens SIMATIC S7-1200 System Manual page 150

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PLC concepts

5.5 Using a memory card

After the CPU reboots, the firmware update starts. The RUN/STOP LED alternately

flashes green and yellow to indicate that the update is being copied. When the

RUN/STOP LED turns on (solid yellow) and the MAINT LED flashes, the copy process

has finished. You must then remove the memory card.

3. After removing the memory card, reboot the CPU again (either by restoring power or by

the alternative methods for rebooting) to load the new firmware.

The user program and hardware configuration are not affected by the firmware update.

When the CPU is powered up, the CPU enters the configured start-up state. (If the startup

mode for your CPU was configured to "Warm restart - mode before POWER OFF", the CPU

will be in STOP mode because the last state of the CPU was STOP.)

Updating multiple modules connected to CPU

If your hardware configuration contains multiple modules that correspond to a single

firmware update file on the memory card, the CPU applies the updates to all applicable

modules (CM, SM, and SB) in configuration order, that is, by increasing order of the module

position in Device Configuration in STEP 7.

If you have downloaded multiple firmware updates to the memory card for multiple modules,

the CPU applies the updates in the order in which you downloaded them to the memory

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK