Radio Engineering Industries Digital BUS-WATCH R1001 Instrukcja Użytkownika Pobierz pdf (Strona 70)

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AC110V

AC230V

DC24V

AC110V

AC230V

AC380V

OUT

IN OUT

R500

R900

R1800

R500

R900

R910

R1800

Relay Interfaces

Optocoupler modules

Applications

All the electrical signals from/to sensors/actuators must be adapted to the PLC's electrical level.

It is the ﬁrst function of the relay or optocoupler interfaces.

Secund function of the relay and optocoupler interfaces is electrical isolation between sensors/actuators and the PLC.

An optocoupler is used as input interface. It is a function of

insulation and adaptation.

A relay is used as output interface. It is voltage adaptation and it

allows more power. The power optocoupler is used when the

number of operations is important.

Pushbutton

Position switch

Sensor

Optocoupler

Relay or

Optocoupler

PLC

Motor

contactor

Motor

Optocoupler

PLC

Relay or

optocoupler

PLC

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