relative beginner in macro development

Sep 03
2017

change, if necessary, even by a machine bending relative beginner in macro development There are


two meth ods ap plied in macro pro gram ming that be long to this cat e gory


Saving Modal Data


To save (store) the cur rent value of a G-code (or other modal codes), is to pre serve them for


later use – or rather re-use The cur rent value is stored into a vari able and re trieved to re store the


orig i nal set ting In a typ i cal macro, there will be many G-codes used, most of them modal This


pro gram ming con ve nience also pres ents a po ten angle machine tial prob lems When a macro ex its, the modal


busbar Machine


G-codes used by the macro will still be in ef fect That cre ates a very dis or ga nized way of macro


pro gram de vel op ment, and can lit er ally be a cause of many se ri ous and hard to find prob lems Al –


though any modal G-code groups can be saved (and even tu ally re stored), only two or three groups


are com monly saved and re placed in most mac ros (add others, if needed):


o


G-code Group 01


Motion Commands


Rapid, Linear, Circular


G00, G01, G02, G03, G33


o


G-code Group 03


Dimensioning Mode


Absolute or Incremental mode


G90 or G91


o


G-code Group 06


Measuring Units


Metric or English


G21 or G20


Typ i cal method of sav ing the cur rent G-code mode is to as sign the se lected sys tem vari able into


a lo cal vari able A com mon vari able may also be used, in some very spe cial ap pli ca tions Here is


an ex am ple that stores the cur rent mode of Group 01 (mo tion com mands), and the cur rent mode


of dimensioning from Group 03:


#31 = #4201


Store the current motion command mode


Group 01 (G00, G01, G02, G03 or G33)


#32 = #4203


Store the current dimensioning mode


Group 03 (G90 or G91)


#33 = #4206


Store the current units mode


Group 06 (G20 or G21)


Note that the last two dig its of the sys tem vari able match the modal G-code Group num ber This


is no co in CNC Angle Line ci dence Such log i cal num ber ing of fers an easy way of re mem ber ing It can also be ap –


plied within a macro pro gram in some in ge nious way, to ta

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