Function Blocks
MATH Function Block
190 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
ATTENTION
A token is an operation, variable, or pair of parenthesis; the end of an equation counts as one
token.
Inputs
IN A
– block input 1
IN B – block input 2
IN C – block input 3
IN D – block input 4
IN E – block input 5
IN F – block input 6
IN G – block input 7
IN H – block input 8
Output
ERR
= ON if block detects an error on any of the following operations:
• division by 0
• fractional root of a negative number (for example: -2**0.5)
• zero to the zero power
• LOG10 or LN of a negative number or 0
• result of x^y is greater than 1.7E + 308.
• result of EXP (x) is greater than 3.4E + 308 or less than 3.4E -308.
ATTENTION
• For the above rules, groups of constants will be combined and treated as one constant.
• Any number less than or equal to 3.4E -308 is considered 0.
OUT = Calculated Output
ATTENTION
• Use only the following words and characters in equations
− +; -; *; /: ^; EXP; LOG10; Ln; Negative (Unary minus);
− ' ' Blank space (ignored)
− 'a' . . 'h' Variables (operand) either a constant or tag
− ( ), [ ], { } Parentheses - 3 types
• A left parenthesis must have a matching right parenthesis.
• The matching parenthesis must be the same type - e.g., ( ), [ ], or { }.
• Parentheses may be nested to any depth.
• Infix operators: +, -, *, /, ^ must have a left and right operand.
• If the '-' operator only has a right operand, it is interpreted as the Unary minus.
To Next Page
Loading...
