Creating A Reset-To-Factory-Defaults Memory Card - Siemens SIMATIC S7 System Manual

Clearing the PLC by reset command followed by PLC power cycle
To clear the PLC when you have forgotten the password, follow these steps:
1. Click the Clear button from the Modify area of the PLC menu ribbon strip.
2. Select the "Reset to factory defaults" choice under "Blocks" and the "Forgot Password"
choice under "Options".
3. Click the Clear button and power cycle the CPU within 60 seconds. Note that you must
physically cycle the power within 60 seconds; a warm start or other reboot is not
sufficient.
After you perform these steps within the required time frame, the CPU resets to factory
defaults.
6.1.17

Creating a reset-to-factory-defaults memory card

You can create a memory card that will return a standard S7-200 SMART CPU to a factory
default state. You can use this reset-to-factory-defaults memory card if you ever want to
clear the contents of a standard CPU. To create a reset-to-factory-defaults memory card,
follow these steps:
1. Using a card reader and Windows explorer, delete all contents from a microSDHC card.
2. Create a simple text file with an editor such as Notepad that contains one line with the
string "RESET_TO_FACTORY". (Do not enter the quotation marks.)
3. Save this file to the microSDHC card root level under the file name "S7_JOB.S7S".
4. Label the card and store it in a safe place for future use.
Note
A reset-to-factory-defaults card is for resetting standard CPUs only
Because the compact serial (CRs) model CPUs do not have a microSD card interface, you
cannot use a reset-to-factory-defaults card to clear the PLC and reset it to factory faults. See
Clearing PLC memory (Page 164) for instructions on how to clear a PLC without the use of a
reset-to-factory-defaults card.
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
6.1 Configuring the operation of the PLC system
PLC device configuration
167