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LD Language Elements
SR2MAN01 11/2007 117
Initialization Status of the contacts and current value on initialization of the program:
z The normally open mode (direct state) is inactive,
z The normally closed mode (inverse state) is active,
z The current value is zero.
Examples Below, three simple examples of the use of a counter (configured in upcounting
mode toward the preset value):
Screen Description
Upcounting and zero resetting:
The counter is incremented each time input I1 is activated.
The counter is reset each time input I2 is activated.
Downcounting and Resetting:
The counter is decremented each time input I1 is activated.
The counter is reset each time the I2 input is activated.
Upcounting, Downcounting and Resetting:
The counter is incremented each time input
I1
is activated. The
counter is decremented each time the
I3
input is activated.
The counter is reset each time the input I2 is activated.
I1-------------CC1
I2-------------RC1
I1-------------CC1
I2-------------RC1
DC1
I1-------------CC1
I2-------------RC1
I3-------------DC1
I3