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ALOG10 |
  
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ALOG10 |
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Block that calculates the antilogarithm (exponent with base 10) of the Value value, storing the result in Result.
Ladder Representation
Block Structure
Variable Type |
Name |
Data Type |
Description |
VAR_INPUT |
EN |
BOOL |
Block enabling |
Value |
REAL |
Reference variable for the operation |
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VAR_OUTPUT |
Done |
BOOL |
End of operation |
Result |
REAL |
Variable that stores the result of the operation |
Operation
When this block has a TRUE value in EN, it sends to the Result output the antilogarithm of the Value variable. If no errors, the Done variable is set. If there is any error in the operation, Done is not set, staying in FALSE status, while Result remains with its value unchanged.
When EN has FALSE value, Result remains unchanged and Done remains in FALSE.
Block Flowchart
Example in Ladder
The above example calculates the antilogarithm of the VALUE variable, storing the final result in RESULT. The block ends with success and Done output is activated.
The above example calculates the antilogarithm of the VALUE variable, storing the final result in RESULT. The indicated value is the minimum input value for which the block revolutions a nonzero result. The block ends with success and Done output is activated.
The above example calculates the antilogarithm of the VALUE variable, storing the final result in RESULT. Below the minimum values cause the block to return a null value. The block ends with success and Done output is activated.
The above example calculates the antilogarithm of the VALUE variable, storing the final result in RESULT. The indicated value is the maximum input value for which the block revolutions a valid result. The block ends with success and Done output is activated.
The above example calculates the antilogarithm of the VALUE variable, storing the final result in RESULT. Values higher than the maximum cause the block to generate an error, the RESULT output remains unchanged and Done output is disabled.
Example in ST
The example below displays the instructions for applying the example above in the ST language.
VAR VALUE : REAL := 38.53183; RESULT : REAL; END_VAR
RESULT := FB_ALOG10(EN:=DI1, Value:=VALUE, Done=>DO1);
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