AC800F SYSTEM (ES,OS), I got a error 1) "network bufferlow,warm restart recommended"
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Is it in house project setup controller or it's in running plant ? error message gives hint of action to solve the issue.
Perform warm start either directly from controller by pressing reset button <4 sec
OR perform warm start from CBF commissioning mode > project tree > Controller resource > double click or right click header > perform warm start (check image below)
If it's running plant be careful performing warm start from controller directly, pressing reset button little longer (>4s) lead to cold start.
A low number of network buffers indicate a problem with the network, where a lot of network errors happen. Besides doing the warmstart like recommended, you should also monitor network activities. You might have bad network plugs/cables, where the wiring looses contact intermittendly, or a bad switch which is going to break, or bad shielding and a high disturbance source, or...
Check it out and solve the issue, otherwise you will get that warmstart message regularily.