How do I set up the IP forwarding function in order to configure IO-Link master using S7-PCT via the interface of the S7 CPU?

Create Date: 2024-8-30 12:03:23|Source: Siemens/Siemens

IP forwarding refers to the ability for a device to forward IP packets between two connected IP subnets. You can enable or disable IP forwarding in STEP 7.
How do I set up the IP forwarding function in order to configure IO-Link master using S7-PCT via the interface of the S7 CPU?

If IP forwarding is enabled, the S7-1500 CPU forwards received IP packets with non-CPU addresses to the local IP subnet or the configured router.

Follow the instructions below to configure an IO-Link master across multiple interfaces and IP boundaries using S7-PCT.

Enable IP forwarding on the S7 CPU

In the Devices & Networks editor, open the device view or network view.

Select the S7-1500 CPU. The CPU properties of the S7-1500 are displayed in the window below.

In the "General" tab, find "Advanced Settings > IP Forwarding".

Enable IPv4 forwarding on the local PLC interface.

Configure the IP address of the IO-Link router on the SIMATIC ET200

On the SIMATIC ET200 with IO-Link Master (connected to the S7-1500 CPU as an IO device), set the "return path" from the SIMATIC ET200 to the Engineer Station PC as follows

In the device and network editor, you can open either the device view or the network view.

Select the IO device. The properties of the IO device are displayed in the window below.

On the General tab, find Ethernet Address.

Enable the Use Router feature.

Enter the router address. The router address is the IP address of the SIMATIC ET200 with IO-Link Master and S7-1500 CPU interfaces.

Establish a routing process between the S7-1500 CPU and the engineering PC

Launch the Command Prompt with the Run as Administrator option.

Determine the interface ID of the PC. Enter the route print command to display the interface list and determine the interface number of the PC.

In this example, the PC's internal Ethernet interface is used, and the interface number is 9.

Use the route add command to add a new route item. In order to configure route entries, you need to understand the system configuration. Determine the following data:

- IP subnet of the node to be reached (ET 200): 192.168.0.0 (network destination address)

- Network subnet mask: 255.255.255.0 (net mask)

- S7-1500 CPU interface IP address for PC connection: 192.168.1.1 (gateway)

- Interface ID: 9 (see step 2)

After the route add command is successfully executed, the message "OK!" is displayed.

Run the route print command to check whether the route items have been added to the IPv4 route table.

The IPv4 routing table shows an entry for connecting the network destination address 192.168.0.0 and subnet mask 255.255.255.0 to Engineering PC 192.168.1.200 through an interface of S7-1500 CPU 192.168.1.1.1.

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