Hitachi WJ200 Series Quick Reference Manual page 94

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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
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Power ON
Short
P24
bar
PLC
L
Input
ON
1
Power OFF
Short
P24
bar
PLC
L
1
Switch
OFF
P24
PLC
Short
bar
L
Input
1
ON
P24
PLC
L
Short
bar
1
Switch
OFF
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Inserting
diode
Switch
OFF
Switch
OFF
92
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Power ON
P24
PLC
L
Input
1
OFF
Power OFF
P24
PLC
L
1
P24
PLC
L
Input
1 OFF
P24
PLC
L
1
Email: charles@automatedpt.com