24
Connecting to PLC
When two or more inverters connected
to common I/O wiring as shown in the
figure at the right are turned on at a
different timing, unwanted current flows,
establishing a closed circuit, and the
inverter is judged to be ON, even though
its switch is set to OFF.
To prevent the unwanted current flow,
install diodes rated at 50 V/0.1 A at the
specified locations.
Connection with Input Terminals
Connection with Output Terminals
Short bar P24
PLC
L
1
Power ON
Input ON
Short bar P24
PLC
L
1
Power OFF
P24
PLC
L
1
Power ON
Input OFF
P24
PLC
L
1
Power OFF
Add diode
Attention when inverter plurals is used
Example of sink logic
Without a diode,
unwanted current
flows, turning the input
on even when the
switch is set to off.
Switch OFF
Switch OFF
Install a diode instead
of a short bar to
prevent the unwanted
current flow.
Using Internal Power Supply of the Inverter
Short bar
Hitachi EH-150 series PLC
Output Module EH-YT16
Hitachi EH-150 series PLC
Output Module EH-YTP16
Hitachi EH-150 series PLC
Output Module EH-YT16
Hitachi EH-150 series PLC
Output Module EH-YTP16
Inverter
S
COM
P24
PLC
L
1
7
24VDC
Inverter
COM
P24
PLC
L
1
7
DC24V
24VDC
S
in
k t
y
p
e l
o
g
ic
S
o
u
rc
e t
y
p
e l
o
g
ic
N
o
n
-v
o
lt
ag
e s
w
it
ch
Using External Power Supply
(Please remove the short bar.)
Short bar
Inverter
S
COM
P24
PLC
L
1
7
24VDC
Inverter
S
COM
P24
PLC
L
1
7
24VDC
24VDC
Inverter
P24
PLC
L
1
7
24VDC
Short bar
Inverter
P24
PLC
L
1
7
24VDC
Short bar
Inverter
P24
PLC
L
1
7
24VDC
24VDC
Inverter
P24
PLC
L
1
7
24VDC
DC24V
S
S
o
u
rc
e t
y
p
e l
o
g
ic
Hitachi EH-150 series PLC
Input Module EH-XD16
Hitachi EH-150 series PLC
Input Module EH-XD16
Inverter
CM2
COM
24VDC
S
in
k t
y
p
e l
o
g
ic
11
12
Inverter
CM2
COM
24VDC
11
12
Stöwer Antriebstechnik GmbH, Enneststrasse 3, 51702 Bergneustadt, tel: 02261-40970, Fax: 02261-41309
