User manual

Publication 1760-UM001A-EN-P

Inside Pico 8-7

Delay Times for Inputs

and Outputs

The time from an input physically energizing to the time

Pico actually reads the input is called the input delay time,

and can be set in Pico.

This function is useful, for example, in order to ensure a

clean input signal despite contact bounce.

Pico DC and Pico AC units function with different input

voltages and therefore also have different evaluation

methods and delay times.

Delay Times for Pico DC Units (1760-L12BWB and 1760-L12BWB-NC)

The debounce for DC signals is 20 ms.

An input signal S1 must therefore be 15V for at least 20 ms at the input terminal

before the switch contact will change from 0 to 1 (A) in the program. If applicable,

this time must also include the program cycle time (B) since Pico does not detect

the signal until the start of a cycle.

The same debounce delay (C) applies when the signal drops out from 1 to 0.

Typical delay times with the input delay turned off are:

• On-delay for I1 to I8 = 0.25 ms

• Off-delay for

–

––

– I1 to I6 = 0.4 ms

–

––

–I7 and I8 = 0.2ms

IMPORTANT

Check that there is no electrical interference affecting the input

signals when the input delay is disabled. Pico responds even to

very short signals.