Its been a while, but I think the Input unit checks the Power supply for operation.
Is there 220 going into the power supply TP11-1 TP11-2?
If there is you should have the +5 +24vdc.
The red alarm LED on the input unit is usually red when the power supply is defective.
If you have 220 and no DC then the power unit may be defective.
There is a way to bypass the alarm on the input unit by connecting P1 & P2, but care must be taken as this by passes a the problem just for diagnostic.
This avoids shutting down to reset the input unit.
Right now If the power comes on the power unit momentarily and then it shuts down, usually this indicates a short circuit on the 24v or possibly the 5v.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.