Topic: DMD0128

TOREAL - Convert to Real

This instruction can only be used in the Expression parameter of the Calculate Expression (MATH) instruction.

The Convert to Real (TOREAL) function will convert the input integer expression to a real number value.

The expression parameter consists of all the text between the bounding parentheses. Any expression parameter can be a constant value, a bit or numeric memory location, an arithmetic expression, and/or mathematical function or other expressions up to a maximum of 1024 characters. Expressions can be nested, so use of parentheses is recommended to ensure proper evaluation order.

The range of acceptable input values is any integer.

Using the Math box example to the right:

• If D1 = 3 the result in R0 would be 3.0
   

• If D1 = -3 the result in R0 would be -3.0

To force floating point math calculations on subsequent math operations, promote the integer expression from it's 32-bit 2's complement integer equivalent to real. For information on promotion and demotion see the help topic for the  MATH - Calculate Expression instruction.

TOREAL( V0 ) / V1 will do a floating point divide operation. Dividing an integer by an integer will do an integer divide, for example, 1 / 2 is 0, but 1.0 / 2 is 0.5.

See Also:

• BCDTO - BCD to Integer / Real

• TOBCD - Integer / Real to BCD
   

• TOINT - Convert to Integer

• TOREAL - Convert to Real

Related Topics:

• MATH - Calculate Expression

Rung Example: