Siemens SIMATIC S7 System Manual page 95

Reset to factory defaults card
You can use a memory card to erase all retained data, putting the CPU back into a factory
default condition.
To be used for reset to factory default (Page 167) purposes, the memory card is organized
as follows:
Table 4- 22
At the root of the card
File: S7_JOB.S7S
Firmware update card
You can use a memory card to update the firmware in a CPU and any connected expansion
modules.
The file and folder organization of a firmware update memory card is as follows:
Table 4- 23
At the root level of the card
File: S7_JOB.S7S
Folder: FWUPDATE.S7S
After power-up, if the CPU detects the presence of a memory card, it locates and opens the
S7_JOB.SYS file on the card. If the CPU discovers the FWUPDATE string in that file, then
the CPU enters a firmware update sequence.
The CPU examines each update file (.upd) in the FWUPDATE.S7S folder and if the order ID
contained in the update file name matches the order ID (MLFB) of a connected device (CPU,
expansion module or signal board), then the CPU updates the firmware of that device with
the firmware content contained within the update file.
Note
Firmware update from STEP 7-Micro/WIN SMART
You can also perform a firmware update from STEP 7-Micro/WIN SMART using the RS485
port. Especially for CPU models that do not have a memory card, this method is valuable.
Refer to the PLC menu section of the STEP 7-Micro/WIN SMART online help for
instructions.
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
Memory card used to reset to factory defaults
A text file containing the word RESET_TO_FACTORY
Memory card used for firmware update purposes
A text file containing the word FWUPDATE
A folder containing update files (.upd) for each device to be updated
PLC concepts
4.3 Saving and restoring data
95