3G5A2-RPT01-PE datasheet(78/182 Pages) OMRON

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Output Surge Current

When connecting a Transistor or Triac Output Unit to an output device having a

high surge current (such as an incandescent lamp), care must be taken to avoid

damage to the Output Unit. The Transistor and Triac Output Units are capable of

withstanding a surge current of ten times the rated current. If the surge current

for a particular device exceeds this amount, use one of the following circuit con-

figurations to protect the Output Unit.

OUT

COM

The above circuit protects the Output Unit by letting the load draw a small current

(about one third the rated current) while the output is OFF, significantly reducing

the surge current. The following circuit reduces the surge current by employing a

current-limiting resistor.

OUT

COM

A Transistor Output Unit’s output cannot be directly connected to a TTL input

because of the transistor’s residual voltage. When connecting TTL circuits to

transistor Output Units, connect a pull-up resistor and a CMOS IC between the

two.

3-5-3 Wiring Examples

The following examples illustrate 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). Be sure to allow for leakage cur-

rents and load inductance.

Input Units

DC Input Units

COM

Contact output

DC input

Transistor Output Residual

Voltage

Wiring I/O Units

Section 3-5

3G5A2-RPT01-PE Datasheet(PDF) 78 Page - Omron Electronics LLC