6.3.16 Evaluate (EVAL)
Description
The
EVAL function evaluates a transferred expression and then executes it. With this function,
expressions can be programmed during runtime. This can be useful, for example, for indexed
access operations to variables.
Programming
Syntax: EVAL
(exp)
Description: Evaluates an expression
Parameters: exp Logic expression
Example
VAR1=(S)
VAR2=(S)
VAR3=(S)
VAR4=(S)
CHANGE()
REG[7] = EVAL("VAR"<<REG[5]) ; The expression in parentheses produces VAR3 if the
value
of REG[5] is equal to 3. The value of VAR3 is,
therefore, assigned to REG[7].
IF REG[5] == 1
REG[7] = VAR1
ELSE
IF REG[5] == 2
REG[7] = VAR2
ELSE
IF REG[5] == 3
REG[7] = VAR3
ELSE
IF REG[5] == 4
REG[7] = VAR4
ENDIF
ENDIF
ENDIF
ENDIF
END_CHANGE
Programming commands
6.3 Functions
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126 Programming Manual, 10/2015, 6FC5397-3DP40-5BA3
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