Siemens S7-400 Equipment Manual page 30

Performance data
2.10 Characteristic data of the integrated 4port switch
The switch monitors the age of the learned addresses. Addresses that exceed the "aging time"
are deleted. The aging time is 5 minutes.
Ports can be deactivated individually
The ports of the switch integrated in the CP can be deactivated individually in STEP 7 in the
"Port parameters" parameter group. This can, for example, be used for service purposes.
The port is turned off completely when it is disabled. The corresponding LED on the device
(for example X2P1) is then turned off.
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Equipment Manual, 03/2023, C79000-G8976-C256-07
CP 443-1 Advanced