HEIDENHAIN TNC 407 (243 020) Technical Manual User Manual
Page 261
–"Free rotation" :
A free rotation of the rotary axis can be activated by the PLC. "Free rotation" means that the axis of
rotation can be turned as often as required (with a display of 0 to 360°) without being affected by
software limit switches.
The free rotation function is a PLC-function, i.e. the PLC-program must be created by the
manufacturer of the machine in the proper form. The function could, for example, be activated by M-
functions. The choice of axes and the direction of traverse are made by specific bytes. The feed for
free rotation is the same as the feed for PLC-positioning of the axes 4 and 5 (W566 and W568).
The max. feed is 300 000 °/min. The feed is not displayed in the status-window. The feed can be
continuously varied by the PLC with an override-percentage (W754), e.g. by copying W494 (current
feed-override) to W754. The free rotation function is activated and deactivated with marker M2720.
If M2720 is set by PLC, the NC takes the information from B518 and B519 and resets M2720.
Marker
Function
Set
Reset
M 2720
Activate/deactivate
PLC
NC
"Free-rotation" of rotary axis
Address
Function
B518
0 =
"Free-rotation"
cancelled
8
= "Free-rotation" for 4th axis
16
= "Free-rotation" for 5th axis
B519
Definition of the direction of traverse
–
+
Entry value
4th and 5th axes
0
4th axis
5th axis
8
5th axis
4th axis
16
4th and 5th axes
24
W754
Percentage for feed-override "free rotation"
(0 to 300 %)