Lenze PM94P01C - Manual (Page 38)

PM94P01C 36
Programming
2.3 Arithmetic Expressions
Table 8 lists the four arithmetic functions supported by the Indexer program. Constants as well as User and System
variables can be part of the arithmetic expressions.
Examples.
V1 = V1+V2
;Add two user variables
V1 = V1-1 ;Subtract constant from variable
V2 = V1+APOS ;Add User and System (actual position) variables
APOS = 20 ;Set System variable
V5 = V1*(V2+V3*5/2+1) ;Complicated expression
Table 8: Supported Arithmetic Expressions
Operator Symbol
Addition +
Subtraction -
Multiplication *
Division /
Result overflow for “*” and “/” operations will cause arithmetic overflow fault F_19. Result overflow/underflow for “+” and
“-” operations does not cause an arithmetic fault.
2.4 Logical Expressions and Operators
Bitwise, Boolean, and comparison operators are considered as Logical Operators. They operate on logical values of the
operands. There are two possible values for logical operand: TRUE and FALSE. Any value contained in a User variable,
System variable or flag is treated as TRUE or FALSE with these types of the operators. If a variable value equals “0”, it
is considered FALSE. All other values (non-0) including negative numbers are considered TRUE.
2.4.1 Bitwise Operators
Table 9 lists the bitwise operators supported by the Indexer program.
Table 9: Supported Bitwise Operators
Operator Symbol
AND &
OR |
XOR ^
NOT !
Both User or System variables can be used with these operators. In order to perform a bitwise (Boolean) operation, the
value must be referenced in hexadecimal format. Example: bit 22 alone would be referenced as 0x400000.
Examples:
V1 = V2 & 0xF
;clear all bits but lowest 4
IF (INPUTS & 0x3) ;check inputs 0 and 1
V1 = V1 | 0xff
;set lowest 8 bits
V1 = INPUTS ^ 0xF ;invert inputs 0-3
V1 = !IN_A1 ;invert input A1