Siemens SINUMERIK 840Di Function Manual page 741

2.1.9 Main axes
Meaning
A main axis is an axis that is interpolated by the main run.
This interpolation can be started:
• From synchronized actions
• From the PLC via special function blocks in the PLC basic program
• Via the setting data or from the part program
Channel control
An axis interpolated by the main axis reacts in terms of:
• NC STOP
• Alarm handling
• Program control
• End of program
• RESET
Application
Certain axes in the main run can be decoupled at the channel response triggered by the NC
program sequence and controlled from the PLC. These axes are also interpolated in the
main run and respond independently for the channel and program sequence.
A PLC-controlled axis can then be controlled independently by the NC.
The actions below are affected:
• The sequence for canceling the axis (equivalent to delete distance-to-go)
• Stopping or interrupting the axis
• Continuing the axis (continue sequence of motion)
• Resetting the axis to its basic status
Axis Types, Coordinate Systems, Frames (K2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
(as command axes due to an event via block-related, modal or static synchronized
actions)
(named as a concurrent positioning axis or a PLC axis)
(as an asynchronous or block-synchronous oscillating axis)
Note
The response at the end of the program varies. The axis movement need not always be
completed and, therefore, may carry on beyond the end of the program.
Detailed Description
2.1 Axes
2-11