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Diagnostics and upkeep
5.2 Maintenance
Procedure:
1. Set the operating mode switch of the CPU to STOP.
Ensure that no write functions (e.g. online or test functions) are active in the STOP state.
2. Remove the SIMATIC Memory Card with the configuration data from the slot of the CPU.
3. Insert the SD card with the firmware file in the card slot of the CPU.
The firmware update starts shortly after the card has been inserted. The display shows the
following: "STOP - FW UPDATE"
If errors occur, appropriate messages are displayed.
After completing the firmware update, the display shows a result page.
A successful firmware update can be recognized by the following LED pattern from the
CPU:
– RUN lights up yellow.
– MAINT flashing yellow.
4. Remove the SD card and insert the SIMATIC Memory Card again.
5. Set the operating mode switch of the CPU to RUN.
The module uses the new firmware during startup.
For the LED pattern of the module during startup, refer to section LEDs (Page 23).
5.2.2
Module replacement
General procedure
The configuration data of the module is stored on the CPU. This makes it possible to replace
this module with a module of the same type (identical article number) without a
programming device.
If you want to exchange a module with the article number of the predecessor module for a
newer module with the current article number (same module name), the data of the older
module is adopted when the newer module starts.
Note
Note the power loss
When replacing an older module with a new module, note the power loss of the new module,
see section Technical specifications (Page 53).
Check whether the power supply of the station is still ensured with the new module.
52
Operating Instructions, 04/2023, C79000-G8976-C355-05
SIMATIC CM 1542-1
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