Festo Контроллер позиционирования CPX-CMAX - Manual (Page 334)

A. Notes on commissioning and service
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Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
A.3.5 Firmware update
Updating the CMAX firmware can be done with the FCT PlugIn
CMAX via the diagnostic interface of the CPX node.
If no valid firmware is loaded on the module at the time of
switching on, the error E74 no firmware" is indicated.
The bootloader is not overwritten in the event of a firmware
update, switching off during download does therefore not
cause the CMAX be become inoperative. The download can
be started again. The firmware files contain compatibility
information to ensure that the bootloader and the firmware
harmonize.