PLC Programming Example

We can use the "FOR DO" command structure to find the sought value in an array. In the example below, I will explain how to run the "FOR DO" command in the STL language that I have prepared for you and understand the index number of a number in the array or whether this number is in the array. The "SIZE" instruction is an instruction that returns the number of elements of the parameterized array. If you know how many elements the array has, you can enter the part inside the "FOR DO" loop. If you want to write parametrically without errors, you can use the "SIZE" command. Size(BarcodeArray,0,SizeCount); command returns 100 to SizeCount because BarcodeArray array has 100 elements. The data type of the SizeCount tag is DINT. BarcodeFound :=0; // if the value we are looking for is...

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Count Down (CTD)

The CTD instruction counts downward each time the rung-condition-in transitions from false to true. Ladder Diagram Operand Data Type Format Description Counter COUNTER Counter structure Preset DINT immediate Value of Counter.PRE. Accum DINT immediate Value of Counter.ACC. COUNTER Structure Mnemonic Data Type Description .CD BOOL The countdown enable bit contains rung-condition-in when the instruction was last executed. .DN BOOL The done bit when indicates the counting operation is complete. .OV BOOL The overflow...

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