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The g156 may be printed on a label near the controller’s memory slot or on the mainboard.

If "g156" refers to a G-code, it represents a specific, though often manufacturer-specific, function. Standard G-codes usually range from G00 to G99 in common Fanuc-style controllers. However, many modern controllers (such as Siemens, Heidenhain, or Mazak) extend their logic into the hundreds. Code G156 could be a macro call, a high-speed machining mode, or a specific coordinate system rotation. cnc-auto-g156.img