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MAX |
  
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MAX |
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Block that compares the values of Value1 and Value2 and stores the highest of them in Result.
Ladder Representation
Block Structure
Variable Type |
Name |
Data Type |
Description |
VAR_INPUT |
EN |
BOOL |
Block enabling |
Value1 |
BYTE USINT SINT WORD UINT INT DWORD UDINT DINT REAL LREAL |
First value of comparison |
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Value2 |
BYTE USINT SINT WORD UINT INT DWORD UDINT DINT REAL LREAL |
Second value of comparison |
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VAR_OUTPUT |
Done |
BOOL |
End of operation |
Result |
BYTE USINT SINT WORD UINT INT DWORD UDINT DINT REAL LREAL |
Highest of the values compared |
Operation
When this block has a TRUE value in EN, it sends to the Result output the highest value in the comparison between Value1 and Value2. 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 maximum value between VALUE 1 and VALUE2 variables, storing the final result in RESULT. The block ends with success and Done output is activated.
The above example calculates the maximum value between VALUE 1 and VALUE2 variables, storing the final result in RESULT. The block ends with success and Done output is activated. Notice that the types of the input variables can be different without causing execution problems.
The above example calculates the maximum value between VALUE 1 and VALUE2 variables, storing the final result in RESULT. Since the result is higher than the maximum supported by SINT type, the block generates an error and Done output is disabled.
Example in ST
The example below displays the instructions for applying the example above in the ST language.
VAR VALUE1 : REAL := 89.8; VALUE2 : SINT := 50; RESULT : SINT; END_VAR
RESULT := FB_MAX( EN:=DI1, Value1:=VALUE1, Value2:=VALUE2, Done=>DO1);
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