Rockwell-automation DeviceLogix System User Manual Manual de usuario descargar pdf (Pagina 101)

Publication RA-UM003B-EN-P - February 2010 101

Navigate the Old Ladder Editor Interface Chapter 4

Down Counter

The down counter can be an independent down counter or it can

work in combination with an up counter as an up down counter. The

down only counter can be consider an up down counter, but without

count up input.

The counter increments the accumulator any time the count up input

changes from false to true and decrements the counter any time the

count down input changes from false to true. When the accumulator is

above or equal to the preset value, the counter sets its output to true.

When the accumulator falls below the preset value, the counter resets

its output to false. As with the up counter, the up down counter resets

when a true level is detected on the reset input. When a reset occurs,

the counter causes the accumulator to be set to zero and sets the

output to false. Refer to the illustration of the counter function for

clarification.The illustration shows an up counter with a preset value

of 3.

Count Down Input

Count Input

Reset

Output

Count Value

44019

1 2 ... 96 97 98 99 100 101 102 103 104 105 106 ... 208 209

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Rockwell-automation DeviceLogix System User Manual Manual de usuario Pagina 101