Mitsubishi MELSEC-F FX1N-40MT-001 - Series and Parallel Input Connections

FX1N Series Programmable Controllers Inputs 5.
5-4
5.1.3 Diodes and Inputs Connected in Series
Vdrop across the diode Max. 4V
No more than 2 LEDs should be connected in series.
FX 0N, FX 2N
Extention block
X
S/S
24V
X
0V
S/S
FX 1N