Hitachi WJ200 Series Quick Reference Manual page 93

As described on page 4-14 of this manual, inverter doesn't block the current flowing
into itself when it is not powered. This may cause the closed circuit when two or more
inverters are connected to common I/O wiring as shown below to result in unexpected
turning the on the input. This may lead to dangerous situation. To avoid this closed
circuit, please put the diode (rated:50V/0.1A) in the path as described below.
In case of Source logic
Short
bar
Short
bar
Switch
OFF
Short
bar
Short
bar
Switch
OFF
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Power ON
P24
PLC
L
Input
Inserting
ON
1
diode
Power OFF
P24
PLC
L
1
P24
PLC
L
Input
1
ON
P24
PLC
L
1
92
Power ON
P24
PLC
L
Input
1 OFF
Power OFF
P24
PLC
L
1
Switch
OFF
P24
PLC
L
Input
1
OFF
P24
PLC
L
1
Switch
OFF