Siemens SIMATIC S7-1500 Manual page 37

Product overview
2.4 Firmware functions
Special features
Note
Initial startup with an empty SIMATIC memory card
When the CPU starts up for the first time with an empty SIMATIC memory card, the card is
prepared for use with C/C++ Runtime. This process takes up to three minutes. Do not turn off
the CPU during this phase; the STOP LED flashes.
Note
Defective C/C++ Runtime containers
The three C/C++ Runtime containers are available in the "/CppEnv1.MFP" directory on the
SIMATIC memory card.
If the C/C++ Runtime containers are damaged or lost when the CPU is switched off, a
diagnostic entry is created in the diagnostic buffer of the CPU the next time the CPU is started
up. C/C++ Runtime cannot be reached, and the ERROR LED is flashing.
If automatic repair of the containers by the automation system is not possible, the containers
can no longer be used by the Linux file system. The automation system starts C++ Runtime in
root mode.
A new logon with the standard user and password is possible. However, you cannot make
any permanent changes to the automation system, e.g:
• Change the password
• Save data
• Change system settings
Solution:
• Copy a previously created backup copy of the C/C++ Runtime containers to the SIMATIC
memory card.
or
• Delete the affected C/C++ Runtime container from the SIMATIC memory card. The
automation system then recreates the container during the next startup.
Note
Affecting the performance of the CPU
Depending on the type of programming, C/C++ Runtime applications, such as mass storage
accesses to the SIMATIC memory card, can affect the performance of the CPU.
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CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 07/2021, A5E40882737-AB