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STR_COPY_LAST Cópia de Fim de Strings |
  
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STR_COPY_LAST Cópia de Fim de Strings |
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Block that performs a copy of a final section of STR, storing the result in DST.
Ladder Representation
Block Structure
Variable Type |
Name |
Data Type |
Description |
VAR_INPUT |
EN |
BOOL |
Block enabling |
STR |
STRING |
Original STRING |
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LEN |
BYTE |
Number of characters to be copied from the end of STR |
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VAR_OUTPUT |
DONE |
BOOL |
Output enabling |
DST |
BYTE |
Variable that receives the new STRING |
Operation
This block remains active as long as EN is at TRUE level, updating the value of DST according to the input parameters. DST receives a number of characters from STR1 defined by LEN from the final position of STR, returning toward the beginning.
The DONE value forwards to the next Ladder block the EN value when the operation is completed.
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NOTE! If the size of DST is less than the number of characters copied from STR, the resulting value will be truncated. |
Compatibility
Device |
Version |
PLC300 |
2.10 or higher |
Block Flowchart
Example in Ladder
In the example above, zero characters are copied from final position STR1, and the result is sent to DST_6. When the block is ended successfully, the DONE output is activated. Note that, when LEN is zero, the output is always built as a null STRING.
In the example above, two characters are copied from final position STR1, and the result is sent to DST_6. When the block is ended successfully, the DONE output is activated.
In the example above, four characters are copied from final position of STR1, and the result is sent to DST_6. When the block is ended successfully, the DONE output is activated.
In the example above, eight characters are copied from final position STR1, and the result is sent to DST_6. When the block is ended successfully, the DONE output is activated. Note that if LEN is greater than the size of STR1, STR1 is copied in full, without generating an error.
In the example above, four characters are copied from final position of STR1, and the result is sent to DST_2. Since the size of DST_2 is 2, the last two characters copied are discarded. The block ends successfully, Done output is activated.
Example in ST
The example below displays the instructions for applying the example above in the ST language.
VAR STR1 : STRING := '1234'; LEN : BYTE := 4; DST_2 : STRING; END_VAR
DST_2 := FB_STR_COPY_LAST( EN:=DI1, STR:=STR1, LEN:=LEN, Done=>DO1);
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