Mitsubishi Electric M80 Series Maintenance Manual page 76

M800/M80/E80 Series Maintenance Manual
2 Daily Maintenance and Periodic Maintenance
Remote I/O unit (FCU8-DX220/230/231)
When FUSE LED is not lit and 24VDCIN LED is lit (*2), the fuse is blown out.
(*2) When 24VDCIN LED is not lit, it is considered that the power is not supplied.
Confirm that the power is correctly supplied.
Remote I/O unit (FCU8-DX213/213-1/654/654-1)
When the indication window of the fuse becomes white, the fuse is blown out.
Indication Window :
FCU8-DX220/230/231
FUSE : Not lit
24VDCIN : Lit
FCU8-DX213/213-1/654/654-1
White
MP63
6 3
A
49 IB-1501273-F