CTU_UDINT block

Short summary

Functionality

The block is an up-counter (for UDINT values).

If there is a positive →edge at input CU, the counter is activated and increments the counter value by 1. If input R is →turned on, the counter value is reset to value 0. Enter a limiting value at input PV. If this limiting value is reached or exceeded, output Q is set to value TRUE (or an equivalent). The incrementing is stopped, if the upper limit of UDINT (= value 4,294,967,295) is reached. Output CV returns the current counter value of the block.

In-/outputs

Input EN and output ENO are available when →calling the block. See "Execution control: EN, ENO" for information on input EN and output ENO.

See:

• "Blocks for safe logic" whether this block is supported for developing safety-relevant applications.

• "Highlighting safe logic in the FBD-editor" for the effects when using the block as a block for safe logic.

Example for usage within ST-editor

PROGRAM Test

    VAR

        myCTU          : CTU_UDINT;

        StartCounter   : BOOL;

        RestartCounter : BOOL;

        out            : BOOL;

        counter        : UDINT;

    END_VAR

    myCTU(CU := StartCounter, R := RestartCounter, PV := 10, Q => out, CV => counter);

    (* Instance of block 'CTU_UDINT' is called: The counter is activated, when 'StartCounter' is 'TRUE'. The value for counting is reset to '0', when 'RestartCounter' is 'TRUE'. *)

    (* The limiting value for counting is '10'. *)

    (* Appropriate variables access the outputs. *)

END_PROGRAM

When creating your application within the ST-editor, enter a call of a block by typing the text as requested by the syntax or use Content Assist.