Unitronics IO-RO8 Manual page 5

1 2 / 0 1
Wiring Outputs' Power Supply
1 Connect the "positive" cable to the "+VO" terminal, and the "negative" to the "0V"
terminal.
A non-isolated power supply can be used provided that a 0V signal is connected to the chassis.
Do not connect the 'Neutral' or 'Line' signal of the 110/220VAC to the device's 0V pin.
In the event of voltage fluctuations or non-conformity to voltage power supply specifications, connect the
device to a regulated power supply.
+V (24VDC)
L1, L2, L3 (115/230VAC)
0V 0V
N N
Increasing Contact Life Span
Both models have 8 relay outputs. To increase the
life span of these contacts and protect the module
from potential damage by reverse EMF, connect:
a clamping diode in parallel with each
inductive DC load,
an RC snubber circuit in parallel with each
AC
inductive load.
* Note that only the IO-RO8 requires 24VDC as
shown; IO-RO8L requires 12VDC.
Unitronics Industrial Automation Systems
IO -RO 8, IO -RO 8L
*
0V 0V
N N
Load
POWER
Circuit Protection
Device
+V
0V
Outputs'
power supply
L1, L2, L3 (115/230VAC)
POWER
+V
(24VDC)
I / O E x p a n s i o n M o d u l e
Load
N N N N
0V 0V 0V 0V
*
+V (24VDC)
C
R
0V N
L1, L2, L3
*
(115/230VAC)
5