3. Commissioning
3.6 Automatic booting of the memory card
3.6 Automatic booting of the memory card
easyE4 base devices can be booted from the memory card.
To be able to do this, the following prerequisites must be met:
l
The microSD memory card must contain at least one compiled PRG program.
l
One of the programs must have been set as the starting program, i.e., the
microSD memory card must contain a BOOT.TXT file.
l
If there is a program on the base device already, the Allow overwriting via card
option must be enabled in the program.
If all these prerequisites are met, the device will boot from the card as follows:
Insert the memory card while the device is de-energized.
Switch on the supply voltage.
Since the RUN start option is enabled by default, the device will automatically
switch to RUN mode.
As soon as the easyE4 device switches to RUN mode, it will check whether there is a
program in its internal memory.
If there are none, the following step will be skipped.
If there is, it will check whether the Allow overwriting via card option is enabled
Assembling a base device with expansions
If this option is enabled, the starting program specified in the BOOT.TXT file will be
copied from the card to the internal device memory and run.
The steps carried out when the device is turned on are shown in detail in the cor-
responding flowchart – please refer to → "Overview of switch-on behavior", page 115.
Meeting the applicable prerequisites
There are three different ways to prepare a microSD memory card for booting. Fol-
lowing is a description:
1. Preparing the card in the PC for booting with easySoft 8
The microSD memory card must be inserted into a slot on the PC and written
to from there.
2. Preparing the card in the device for booting with easySoft 8
The microSD memory card is already in the device and is written to from the
PC.
3. Preparing the card for booting on the device itself
The microSD memory card is already in the device and is prepared for booting
on the device itself. easySoft 8 is not needed in this case.
124
easyE402/24 MN050009ENEaton.com
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