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NOISE IMMUNITY

optoisolator, optocoupler – input signal

The LED input circuit is

isolated from the photo

transistor, as shown.

Slower transient pulses (> 0.1

ms) may still power the LED

and thus pass a signal to the

transistor side.

25

NOISE IMMUNITY

optoisolator – driver side

Acrobat Document

Isolating noisy output

Typical Specifications:

Controlling or switching DC loads of 5-

60 VDC. 4000 volts (transient) of

optical isolation between the field

devices and the control logic.

Typical uses and applications for DC

output modules include switching the

following loads:

DC relays

DC solenoids

DC lamps or indicators

PLC logic

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