CV500-SLK21 datasheet(76/182 Pages) OMRON

76 / 182 page

When an inductive load is connected to an I/O Unit, connect a surge suppressor

or diode in parallel with the load, as shown in the following diagram. The diode

will adsorb the back electromagnetic field generated by the load.

COM

Diode

DC input

OUT

COM

Relay Output Unit

Triac Output Unit

OUT

COM

Relay Output Unit

Transistor Output Unit

Diode

Surge suppressor

where for the surge suppressor,

Resistor: 50

Capacitor: 0.47 F

Voltage:

200 V

and the diode,

Breakdown voltage: at least 3 times load voltage

Mean rectification current: 1 A

Input Units

Voltage Inputs

Do not wire voltage inputs as shown on the left below.

0 V

Sensor

power

supply

Voltage output

Output

COM (–)

IN DC input

Incorrect

0 V

Sensor

power

supply

Voltage output

Output

COM (+)

IN DC input

Correct

Input Leakage Current

When two-wire sensors, such as photoelectric sensors, proximity sensors or

limit switches with indicators are connected to the PC as input devices, the input

bit may be turned ON erroneously by leakage current. In order to prevent this,

connect a bleeder resistor across the input to reduce the input impedance.

Sensor

Input

power

supply

Bleeder

resistor

Inductive Load Surge

Suppressor

Wiring I/O Units

Section 3-5

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