Hi,

at first the diagnostics window shows 2 different things, unfortunately it can be confusing how its done.

1. Additional information:

Anything stated below the additional information note, is just a information, not an error. Yes, you have to check if the modules are compatible. In this case, they are. Means you can configure the predecessor "old module" and use the successor "new module" in the real hardware. The new module is spare part compatible, means this does not cause the error above.

2. The error message:

This can be connected, to the additional information. For example if in hw config the new module would be configured, but in the real hardware the old one was used. This way around, it would not be compatible.
But in this case, the error does have a different reason to find out. This "online/offline" difference, is not related to the additional information below! Check the rest of the configuration, especially the "new potential group" means, the light/white BaseUnits. Every slot, a light/white BaseUnit was plugged in, this has to be configured in hw-config as well. If its not done correctly -> online/offline difference. Check the diagnostics buffer of the cpu, sometimes some more information can be found there.
Check also all other periphery modules especially firmware versions. So is an DI/DQ/AI/AQ used somewhere, check if the correct (or compatible) product numbers were used and also check the configured firmware version.

So if for an DI a newer firmware was configured as the module itself has, this also will lead into an error with online/offline difference shown in the interface module.

Alternative approach:
The new product number is only available up from TIA V18 in the internal hw catalog. But you can use the GSD file to configure the new interface module with its new product number. So you will not receive the "additional information" anymore. But the other/real cause must fit anyways.

Delivery release for the innovated ET 200SP interface module IM 155-6 PN ST

-> yes, this will lead to the note in diagnostics page "online/offline" difference. But does not cause an error.
-> There is a different cause for the error shown above the "additional information" field.

6ES7155-6AU02-0BN0

-> means only available in (up from) internal catalog of V18

-> but as an alternative, GSD can be used (install the GSD -> device can be found in "other field devices" folder).

PROFINET GSD files: I/O – ET 200SP

regards

sancruz