Ip Forwarding - Siemens SIMATIC ET 200AL System Manual

Routing

11.3 IP forwarding

11.3 IP forwarding
Forwarding of IP packets with IP forwarding
IP forwarding is a function of devices to forward IP packets between two connected
IP subnets.
Enable/disable the IP forwarding function in STEP 7. When IP forwarding is enabled, the
S7-1500 CPU forwards received IP packets not addressed to the CPU to locally connected
IP subnets or to a configured router.
The following figure shows how a programming device accesses data of an HMI device.
Programming device and HMI device are located in different IP subnets. The IP subnets are
connected to the two interfaces X1 and X2 of the CPU.
Figure 11-6
Areas of application
• Easy access from the control level to the field level for configuration and parameter
assignment of field devices, e.g. via PDM or web browser
• Simplified integration of devices for remote access, e.g. for diagnostics during remote
maintenance or firmware update
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Access of a programming device to an HMI via IP forwarding
Function Manual, 05/2021, A5E03735815-AJ
Communication