Lenze E94P PositionServo with MVOB - Manual (Page 38)

36 L PM94H201B_13xxxxxx_EN
Programming
2.3 Arithmetic Expressions
Table 7 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*5/3) ;Complicated expression
Table 7: Supported Arithmetic Expressions
Operator Symbol
Addition +
Subtraction -
Multiplication *
Division /
Register (variable) overflow for “*” and “/” operations will cause arithmetic overflow fault F_19. Register (variable)
overflow/underflow for “+” and “-” operations does not cause an arithmetic fault.
2.4 Logical Expressions and Operators
Bitwise, Boolean, and comparison operators are referred to as Logical Operators. Bitwise operators are used to change
individual bits within an operand (variable). Bitwise operation works at the binary level of the variables, changing
specified bits or bit patterns within those variables.
Boolean operators are used to combine simple or complex expressions within a single logic statement. They are used
to define a condition that ultimately equates to either True or False.
Comparison operators are used to perform a test between two values and to return a result indicating whether or not the
test (Comparison) evaluates to true or false.
2.4.1 Bitwise Operators
Table 8 lists the bitwise operators supported by the Indexer program.
Table 8: 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 often easier in entered in hexadecimal format. To enter a number in hexadecimal use the characters ‘0x’
immediately prior to the hexadecimal number. 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