Logic Type

Overview

The digital inputs and outputs of this product can be wired for positive logic or negative logic.

Logic type	Active state
(1) Positive logic	Output supplies current (source output) Current flows to the input (sink input)
(2) Negative logic	Output draws current (sink output) Current flows from the input (source input)

Logic type

Active state

(1) Positive logic

Output supplies current (source output)

Current flows to the input (sink input)

(2) Negative logic

Output draws current (sink output)

Current flows from the input (source input)

Signal inputs are protected against reverse polarity, outputs are short-circuit protected. The inputs and outputs are functionally isolated.

If negative logic is used, a ground fault of a signal is detected as an On state.

WARNING

UNINTENDED EQUIPMENT OPERATION

Verify that a short-circuit of a signal cannot cause unintended equipment operation.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

Selection of the Logic Type

The logic type is determined by the wiring of DI_COM and DQ_COM. The logic type affects wiring and control of the sensors; therefore, you must determine the required value in the engineering phase in view of the application.

Special Case: Safety Function STO

The inputs for the safety function STO (inputs STO_A and STO_B) can only be wired for positive logic.