Siemens SIMATIC ET 200AL, System Manual

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Addressing via DHCP
10.2 DHCP with DNS
Communication
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Function Manual, 05/2021, A5E03735815-AJ
For this configuration, you must first activate the host name and domain configuration in
STEP 7. Then configure the host name in STEP 7 and configure that the domain is
obtained via DHCP.
Requirements
• You have activated the address assignment via DHCP for at least one interface of the S7-
1500 CPU.
Configuration of host and domain name
To activate the host name and domain configuration in STEP 7, follow these steps:
1.
Select the S7-1500 CPU in STEP 7.
2. In the properties of the CPU, navigate to "Advanced configuration" > "Host and domain
name" > "Host and domain name configuration".
3. Select the "Enable host name and domain" check box.
Configuring the host name in STEP 7
To configure the host name in STEP 7, follow these steps:
1.
Select the S7-1500 CPU in STEP 7.
2. In the properties of the CPU, navigate to "Advanced configuration" > "Host and domain
name"> "Host and domain name configuration"> "Host name".
3. For "Host name configuration:" select "Set host name in the project" from the drop-down list.
4. Enter the host name for "Host name:".
– Enter your desired host name.
– If you select the "Host name identical to device name" check box, STEP 7 automatically
assigns the device name as the host name.
Only if you have configured the host and domain name in STEP 7, the full name is displayed
for "Full name:".
Assign host name in the user program
To assign the host name in the user program, follow these steps:
1.
Select the S7-1500 CPU in STEP 7.
2. In the properties of the CPU, navigate to "Advanced configuration" > "Host and domain
name" > "Host and domain name configuration" > "Host name".
3. Under "Host name configuration:” select "Set hostname directly on the device (e.g. PLC
program, display)" in the drop-down list.
4. Call the instruction "CommConfig" in the user program. The DATA parameter must point to a
UDT "Conf_Hostname" where the host name is defined.
You can find additional information on the "CommConfig" instruction and on the UDT "Conf-
Hostname" in the STEP 7 online help.