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LD Language Elements
SR2MAN01 11/2007 119
Use of Coils Two coils are associated with the fast counter:
z coil TK1: Enable function input,
z coil RK1: Reset initial counter state input.
The use of these coils is described below.
Enable function input:
Symbol of the Enable Function Input coil of the fast counter:
This element is used to confirm the counter. When this coil is active, each pulse on
the I1 input will increment the Fast counter and each pulse on the I2 input will
decrement it.
Reset initial counter state input:
Symbol of the Reset Initial Counter State Input:
This input resets the counter function to its initial state.
Energizing the coil has the following effect:
z reset the current count value to zero if the count type is TO (up-counting from
the preset value).
z reset the current value to the preset value if the count type is FROM (down-
counting from the preset value).
Example:
Counter reset by pressing on the Z1 key:
Each time the Z1 key is pressed, the counter is reinitialized.
TK1
RK1
Z1 RK1