Ken Roach
Lifetime Supporting Member + Moderator
>My colleague over here is telling once it goes into faulted solid red. it is brand new plc
When the Fault (FLT) LED is flashing red, the controller is faulted but ready for a download of a new program.
When the Fault (FLT) LED is solid red, the controller is "hard faulted" and you cannot communicate with it. If the LED stays solid red after multiple power cycles, then the controller must be replaced.