Siemens SIMATIC S7-1500 Manual page 33

Product overview
2.4 Firmware functions
Note the following restrictions when configuring the PROFINET interface X3 P1 with STEP 7:
• If you disable the option "Activate this port for use" in the port options in STEP 7, the
PROFINET interface X3 P1 is disabled for the CPU and for internal communication with the
C/C++ Runtime.
• The configuration of the "Transmission rate/duplex" has no effect on the connection to the
PROFINET interface X3 P1 and the C/C++ Runtime.
• The "Monitor" option is not supported.
• Topology configuration is not supported.
Figure 2-3 Port options in STEP 7
Note
Availability of the X3 interface
Interface X3 is available only after approximately 1 to 2 minutes after POWER ON of the CPU.
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CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)
Equipment Manual, 07/2021, A5E40882737-AB