Hello, and thank you in advance for your help.
On an Ignition Gateway, I created a device connection to a PLC by entering only the device name and IP address.
The PLC showed a “Connected” status, and in the Designer I created a tag that correctly read a memory area and displayed the value at runtime.
After a few weeks, I realized that the PLC had been configured as a “Siemens S7‑300” device, while the actual PLC model is an S7‑400.
I then deleted the device from Ignition and recreated it using the same name and IP address, this time selecting “Siemens S7‑400” as the device type.
However, the device remained disconnected, and I was never able to get it to connect again.
I also tried deleting and recreating the device multiple times, both as S7‑400 and S7‑300, but it never reconnected.
As a result, the tag in the Designer (which I never deleted) now shows an error.
My question is:
Is there any Ignition setting I should check, or any kind of caching (possibly related to the existing tag or device configuration) that could prevent the device from being recreated and connecting correctly?
From a network perspective, the PLC is always online and reachable, and there are no firewall or communication blocks between Ignition and the PLC.
Any suggestions would be greatly appreciated. Thanks in advance.