Push-Pull Output - Omron NX-ID User Manual

7-5

Push-pull Output

The Digital Output Units with the ON/OFF response time of 1 μs or less use a push-pull output to
increase the speed of the output ON/OFF response.
For this type of the Output Units, use the single load power supply for the I/O power and connected
external devices.
If multiple power supplies are used, the current may flow into the output bits via the diodes built in the
I/O circuit and cause the Output Units to malfunction.
Good Example
Additional I/O
Power Supply
Unit
A1
IOV
IOG
24 VDC
IOV
IOG
A8
Bad Example
Additional I/O
Power Supply
Unit
A1
IOV
IOG
24 VDC
IOV
IOG
A8
NX-series Digital I/O Unit User's Manual (W521)
Transistor
Three-wire
Output Unit
sensor
B1 A1 B1
IOV 0 1
IOV
IOV
IOG IOG IOG
2 3
IOV IOV IOV
IOG IOG
IOG
B8 A8 B8
Three-wire
Transistor
Output Unit
B1 A1 B1 B1
0 1 1
IOV
IOV V IOV IO
IOG IOG IOG IOG
2 2 3
IOV IOV OV IOV
IOG IOG IOG
IOG OG
B8 A8 B8
Additional I/O Power Transistor Output Unit
Supply Unit
IOV
24 VDC
IOG
Additional I/O Power
Supply Unit
sensor
IOV
24 VDC
IOG
7 Digital Output Units
28.8V DC
Three-wire
device
Transistor Output Unit
28.8V DC
Three-wire
device
7
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