HEIDENHAIN TNC 407 (243 020) Technical Manual User Manual
Page 226
The PLC-program must transfer the gear-code to the machine. The NC waits for the
acknowledgement signal "Gear change completed" (M2480) before continuing the program . As
soon as marker M2480 is set by the PLC the NC resets the strobe signal M2043. The marker M2480
may only be set in one PLC-cycle.
Marker
Function
Set
Reset
M2043
Gear-code change signal
NC
NC
M2480
Acknowledgement
PLC
PLC
"Gear change completed"
M2814
Activation of a gear range and spindle speed
PLC
NC
via PLC
D356
Programmed spindle speed
NC
D756
Set spindle-speed from the PLC;
NC, PLC
programmed spindle speed
W256
G-code for S-analogue
NC
An alternating S-analogue voltage can be produced for changing gear. For this purpose the marker
M2490 and the marker M2491 must be alternately set and reset by the PLC. This may be achieved
by interrogating a particular timer in the PLC-program. The markers M2490 and M2491 are reset to
stop the spindle. The output voltage is defined by MP3240.2.
Marker
Function
Set
Reset
M2490
Spindle rotation left (for gear change)
PLC
PLC
M2491
Spindle rotation right (for gear change)
PLC
PLC
MP3240.2 Jog-voltage for gear change
Entry: 0.000 to 9.999 (V)