HEIDENHAIN TNC 306 Technical Manual - Manual (Page 154)

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TNC 406/TNC 306 3 Servo positioning of the NC-axes 3/97
3.6.6 Feed rate override by the PLC
The feed rate may be altered by the override potentiometer or the PLC word W766. Whenever a
value is loaded into W766 the potentiometer becomes inactive. The actual position of the override
potentiometer is loaded into PLC word W494.
W494 position of the feed rate override in percent (NC -> PLC).
W766 percent factor for the feed rate override (PLC -> NC) entry range 0 to 150.
3.7 Non-controlled rotary axis (M03/M04)
If axis 4 is defined as a rotary axis it may be operated as a freely rotating spindle with the
M-functions M03, M04 and M05.
The speed for the rotary axis is taken from machine parameter MP2090 if the PLC doubleword D726
does not contain a value. (M-function M03, M04 and M05: see section M-Functions.)
The markers M2485 and M2486 change the polarity of the analog voltage for the C-axis.
The rotation speed may be altered by the spindle override potentiometer or the PLC word W764.
Whenever a value is loaded into W764 the potentiometer becomes inactive. The actual position of
the override potentiometer is loaded into PLC word W492.
MP2090 Speed for non-controllable rotary axis (M03/ M04)
Entry range 1 to 83 (RPM)
Set Reset
M2485 Status display and sign of analog voltage for C-axis
(M03) PLC PLC
M2486 Status display and sign of analog voltage for C-axis
(M04) PLC PLC
M2487 Status display for C-axis (M05) PLC PLC
D752 Speed for non-controlled rotary axis (M03/M04)
W492 Position of the spindle override in percent
(NC -> PLC)
W764 Percentage factor for spindle override
Entry range 0 to 150