Hello everyone, I currently have a program running on a TIA Portal 1500 PLC with the IP address 172.16.23.### and a gateway set to 172.16.22.01. However, our OEM is unable to connect to the machine via VPN. They can access our older S7-300 (Classic) machines without any issues. My question pertains to the "Online Access" setting in TIA Portal, which uses an IP address starting with 169.***.***.***. What is the purpose of this Online Access feature, and is it necessary to configure a gateway IP for it? Thank you, Stu
Looking for suggestions? Your input would be greatly appreciated!
Based on my experience, utilizing a VPN to connect to PLCs and HMIs via TIA Portal can be inconsistent. In certain projects, I have full access to all functions, while in others, I am limited to only accessing the PLC. Additionally, the choice between PROFINET and standard Ethernet can affect connectivity, as can the decision to use the VPN interface versus the regular Ethernet interface. If you could provide additional details about your setup and requirements, it's possible that someone might be able to offer more valuable insights or solutions.
Could you please share a screenshot of the specific settings you are mentioning?
I'm not extremely familiar with the TIA aspects, but could you tell me the subnet mask for your PLC? Your PLC's IP address is 172.16.23.###, and it uses a gateway of 172.16.22.1. If your PLC is configured with a subnet mask of 255.255.255.0, it won't be able to establish communication with the gateway, which means remote access will not function properly, irrespective of your TIA configurations. However, using a subnet mask of 255.255.254.0 will allow it to work correctly.
If your IP address begins with 169, it may suggest that your Network Interface Card (NIC) is configured for DHCP but hasn't successfully received an IP address. There are various methods a VPN server can use to allocate IP addresses to clients, and in some cases, it may be necessary to manually select an IP address within the same subnet as your device.
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