BECKHOFF CX50x0 - Manual (Page 66)

Notes on the documentation
64 CX50x0 - Hardware Documentation
CPU VTT
CPU VTT voltage.
Memory 1.8 V
Memory power supply (1.8 V).
+3.3 V
Supply voltage, 3.3 V.
+5 V
Supply voltage, 5 V.
+1.5 V
Supply voltage, 1.5 V.
VBatt
Battery voltage.
Fan1 Speed
0 RPM, since no fan is connected.
Board Revision
Hardware version of the CPU board.