User Manual
Chapter 11
GFK-1742F
Jan 2020
Local Logic Tutorial
275
Chapter 11:
Local Logic Tutorial
The Local Logic programming language supports assignment, conditional statements,
arithmetic, logical, and relational operations. The Local Logic program runs synchronously
with the motion module position loop and therefore is deterministic. The language includes
constructs that allow the Local Logic program to communicate information between the
Logic program, the Motion Program, and the host controller. The tutorial focuses on the
local logic language and its communication with motion programs. Chapter 7 provides
additional information concerning the motion programmer language.
11.1
Statements
The Local Logic programming language supports assignment and conditional statements.
Assignment statements permit arithmetic results and bitwise logical operations to be
assigned to a variable. Conditional statements permit conditional local logic code
execution. Conditional execution is based on the value of a constant or variable, or the result
of a relational or bitwise logical expression.
Assignment statements use the “:=” operator. The following example multiplies two
parameter registers and assigns the result to another parameter register.
P001:= P210 * P107;
Note:
Assignment statements require a semi-colon terminator as shown above.
Conditional statements use the IF-THEN-END_IF keyword combination. The END_IF
keyword concludes the conditional statement. The following example checks the Block_1
variables value and conditionally sets a value in a parameter register. Specifically, if the
Block_1 variable’s value equals 5 then the parameter P010 value is set to 100.
IF Block_1 = 5 THEN
P010 := 100;
END_IF;
The IF, THEN, and END_IF keywords are case sensitive, and the END_IF statement is
terminated with a semi-colon. IF statements may be nested up to eight levels and the body
of the IF statements may contain one or more statements. Refer to Chapter 12 for a detailed
description of these statements.