Characteristic Data Of Tcp Connections For Http; Characteristic Data Of The Integrated 2Port Switch - Siemens SIMATIC NET S7-400 Manual

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Note

Note the following for PROFINET IO:

If you use modules with >=32 bytes of input/output data, this can lead to I/O access errors;

access errors are entered in the diagnostics buffer of the CPU.

These I/O access errors occur during operation only in the "consistent user data" mode and

with a low OB1 cycle time.

2.6

Characteristic data of TCP connections for HTTP

For HTTP access, up to 32 TCP connections are available. When necessary, these TCP

connections are used by one or more Web browsers to display data or files of the CP.

2.7

Learning addresses / deleting addresses (aging time)

The switch integrated in the CP reads the source addresses included in the data packets.

The switch therefore learns the addresses of the end devices connected via a port.

If the switch receives a data packet, it directs this packet only to the port via which the

appropriate end node can be obtained.

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 P1) is then turned off.

CP 443-1 (EX30)

Manual, 03/2019, C79000-G8976-C255-05

2.6 Characteristic data of TCP connections for HTTP

Performance data

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