HEIDENHAIN TNC 335 Technical Manual - Manual (Page 174)

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TNC 360 3 Servo Positioning of the NC Axes 4-77
3.6.4 Open control loop
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 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) has been set. After the control loops are opened the
markers M2000 to M2003 are reset by the NC.
As soon as the "Axis in position" marker is reset, the control loop must re-closed so that the axes
can be moved again.
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 4th axis
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 4th axis
3.6.5 Actual - nominal value transfer
If the markers M2552 to M2555 are set, then the actual position value will be transferred to memory
as the nominal position value.
Actual value transfer is possible only in the "Manual" and Electronic handwheel" modes of operation.
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 4th axis