Fsc Expressions; Valid Operators; Format Expressions - Allen-Bradley Logix5000 Reference Manual

Operator Description
+ Add
- Subtract/negate
* Multiply
/ Divide
= Equal
< Less than
<= Less than or equal
> Greater than
>= Greater than or equal
<> Not equal
** Exponent (x to y)
ABS Absolute value
ACS Arc cosine
AND Bitwise AND
ASN Arc sine
ATN Arc tangent
COS Cosine
DEG Radians to degrees
FRD BCD to integer
Array (File)/Misc. Instructions (FAL, FSC, COP, CPS, FLL, AVE, SRT, STD, SIZE)

FSC Expressions

You program expressions in FSC instructions the same as expressions in CMP
instructions. Use the following sections for information on valid operators,
format, and order of operation, which are common to both instructions.

Valid Operators

Optimal
DINT, REAL
DINT, REAL
DINT, REAL
DINT, REAL
DINT, REAL
DINT, REAL
DINT, REAL
DINT, REAL
DINT, REAL
DINT, REAL
DINT, REAL
DINT, REAL
REAL
DINT
REAL
REAL
REAL
DINT, REAL
DINT

Format Expressions

For each operator that you use in an expression, you have to provide one or two
operands (tags or immediate values). Use the following table to format operators
and operands within an expression.
For operators that
operate on
One operand
Two operands
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Operator Description
LN Natural log
LOG Log base 10
MOD Modulo-divide
NOT Bbitwise complement
OR Bitwise OR
RAD Degrees to radians
SIN Sine
SQR Square root
TAN Tangent
TOD Integer to BCD
TRN Truncate
XOR Bitwise exclusive OR
Use this format
Operator(operand)
Operand_a operator operand_b
Chapter 8
Optimal
REAL
REAL
DINT, REAL
DINT
DINT
DINT, REAL
REAL
DINT, REAL
REAL
DINT
DINT, REAL
DINT
Examples
ABS(tag_a)
·tag_b + 5
·tag_c AND tag_d
·(tag_e ** 2) MOD (tag_f /
tag_g)
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