HEIDENHAIN TNC 306 Technical Manual - Manual (Page 153)

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TNC 406/TNC 306 3 Servo positioning of the NC-axes 4-53
3.6.4 Open control loop
Under certain conditions it may be necessary to open the control loop for one or more axes. If the
markers M2544 to M2547 are set, the control loops for the relevant axes will be opened and the
appropriate markers M2000 to M2003 (see section "Axis enable") will be reset by the NC.
If, after the execution of an NC block, the control loop for a particular axis is opened and this axis is
clamped, then it is necessary to delay this opening to give the clamp sufficient time to operate. The
markers M2492 to M2495 and M2572 were introduced for this purpose. If one of these markers is
set, and the appropriate axis is in position, then the next NC block will only then be processed when
the "Open control loop" marker (M2544 to M2547 and M2572) has been set.
Set Reset
M2544 Open control loop X axis PLC PLC
M2545 Open control loop Y axis
M2546 Open control loop Z axis
M2547 Open control loop axis 4
M2572 * Open control loop axis 5
M2492 Await open control loop X axis PLC PLC
M2493 Await open control loop Y axis
M2494 Await open control loop Z axis
M2495 Await open control loop axis 4
M2568 * Await open control loop axis 5
3.6.5 Actual/nominal value transfer
If the markers M2552 to M2555 are set, then the actual position value will be transferred to the
nominal value.
The transfer of the actual value is possible in the "Manual" operating mode, and also during an M-S-
T-strobe, but not in the "Full sequence" operating mode.
Set Reset
M2552 Actual-nominal value transfer X axis PLC PLC
M2553 Actual-nominal value transfer Y axis
M2554 Actual-nominal value transfer Z axis
M2555 Actual-nominal value transfer axis 4
M2564* Actual-nominal value transfer axis 5
* only TNC 406