4-4SectionI/O Connections
41
A
C200H-COV1
1 Cover is provided as an I/O Unit cover for Units that use 10P
terminal block connectors. After the I/O wiring has been completed, slide the
cover up from the bottom, as shown in the illustration below.
Attach
Remove
I/O Unit cover
If a two-wire sensor is used with a
12-VDC or 24-VDC input device, make sure
that
the following conditions are satisfied. Malfunctions will occur if these
condi
-
tions are not satisfied.
• The
relationship between the PC ON voltage and the sensor residual voltage is
as follows:
V
ON
x
V
CC
– V
R
• The relationship between the PC ON current and the sensor control output
(load current) is as follows:
I
OUT (min)
x I
ON
x I
OUT (max)
I
ON
= (V
CC
– V
R
– 1.5 (PC internal residual voltage))/R
IN
Connect R bleeder resistance if I
ON
is less than I
OUT (min)
.
The
constant for bleeder resistance is determined by the following equation.
R x (V
CC
– V
R
)/(I
OUT (min)
– I
ON
)
Power W y (V
CC
– V
R
)
2
/R 4 (margin)
• The
relationship between the PC OFF
current and sensor leakage current is as
follows:
I
OFF
x I
leak
Refer
to the information on input and output leakage current on
page
56 for
details.
The
value of
I
OFF
depends on the Unit used. For Input Units that have an unspe
-
cified OFF current, however, the value of I
OFF
is always 1.8 mA.
V
CC
: Power
supply voltage
V
R
:
Sensor output residual voltage
V
ON
: PC ON voltage I
OUT
:
Sensor control output (load current)
I
ON
: PC OFF current I
leak
:
Sensor leakage current
I
OFF
: PC OFF current R:
Bleeder resistance
R
IN
:
PC input impedance
Two-wire sensor
DC Input Unit
V
R
R
V
CC
R
IN
The
following are examples of how to connect I/O
devices to I/O Units. During
wiring, work slowly and carefully. If an input device is connected to an Output
Unit,
damage may result. Check all I/O devices to make sure they meet the spec
-
ifications (refer to
Appendix B Specifications
).
I/O Unit Cover
DC Two-wire Sensor
Connection Precautions
Wiring Examples
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