HEIDENHAIN TNC 335 Technical Manual - Manual (Page 171)

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3.6 Controlled axes
The machine parameter MP50 determines which of the four NC axes should be controlled.
MP50 Controlled axes
Input value 0 to 15
Bit 0 X axis +0 = not controlled
+1 = controlled
Bit 1 Y axis +0 = not controlled
+2 = controlled
Bit 2 Z axis +0 = not controlled
+4 = controlled
Bit 3 4th axis +0 = not controlled
+8 = controlled
Further parameters for the NC axes may be found in the section "machine axes."
The PLC functions which are described in the following sections are only effective for controlled
axes.
3.6.1 Axis enable, feed rate enable
After switching on the control voltage the "Axis-enable markers" are automatically set by the NC, so
that the machine axes can be held in closed position loops by the control .
The axis-enable markers can be reset by the NC if the control loop is opened by the PLC, see
section "Open control loop").
Set Reset
M2000 Axis enable X NC PLC, NC
M2001 Axis enable Y
M2002 Axis enable Z
M2003 Axis enable 4
The feed rate enable must be specified for all axes by M2451 and complement marker M2467. If the
feed rate enable is removed, the analog voltage is output as 0 V and the axes immediately stop
moving. The letter "F" is then highlighted in the status display.
Set Reset
M2451 Feed rate enable for all axes PLC PLC
M2467 Complement feed rate enable