For simplification we will be working in word address format. #LESSON 2 ## Conditional statements Like most programming languages G-code allows for conditional statements albeit in a rudimentary and limited form. ##comparison operators CNC G-Code used few comparison operators which vary by control. The most common comparison operators for fanuc style controls are; 'NE: NOT EQUAL EQ: EQUAL LE: LESS THAN OR EQUAL LT: LESS THAN GT: GREATER THAN GE: GREATER THAN OR EQUAL' ##IF[] THEN The If Then Conditional statement can be used to instruct your code to jump to a specific sequence or to set a macro variable value. 'IF[(X) NE (Y)] THEN #3000=1.0(X NOT EQUAL TO Y);' this example would display an error message of 'X NOT EQUAL TO Y'. Another example is 'IF[#100 GE 5] THEN GOTO 1' This example would skip the program to sequence N1 if macro 100 is greater than or equal to 5. ##The While Loop The while loop is useful for when you want a sequence of code to repeat until a condition is met. For example let's say you wanted to run a machine wash cycle after running five loads of parts. You could write a while loop to accomplish this. `(MAIN PROGRAM RUNS UP HERE);' '#101=#101+1;' 'WHILE[#101 GE 5] DO1' 'M98P(WASH CYCLE PROGRAM NUMBER);' '#101=0; END1;`