Here is a short history of Heidenhain cnc controls with the years.
HEIDENHAIN CNC Control’s History
1968 VRZ 59.4 bidirectional counter for one axis
1974 HEIDENHAIN 5041 numerical position display unit
1976 TNC 110 and TNC 120 numeric positioning controls for 3 axes
1979 TNC 131 / TNC 135 numerical straight cut controls
1981 TNC 145 numeric contouring control for 3 axes
1984 TNC 155 numerical contouring control for 4 axes with graphic simulation of workpiece machining
HEIDENHAIN TNC 100 Series
1995 EnDat synchronous serial interface for absolute position encoders
1996 TNC 426 contouring control with digital drive control for 5 axes
1996 TNC 410 MA HEIDENHAIN complete package with inverters and motors
HEIDENHAIN TNC 400 Series
2004 iTNC 530 contouring control with alternative operating mode smarT.NC
HEIDENHAIN TNC 500 Series
2007 TNC 620 contouring control with HSCI, the serial controller interface
2011 TNC 640 contouring control for combined milling and turning operations
HEIDENHAIN TNC 600 Series
