Siemens SINUMERIK 840D sl Programming Manual page 464

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Motion synchronous actions

10.4 Actions in synchronized actions

Position offset in the basic coordinate system

With the system variable $AA_OFF[axis] on overlaid movement of each axis in the

channel is possible. It acts as a position offset in the basic coordinate system.

The position offset programmed in this way is overlaid immediately in the axis concerned,

whether the axis is being moved by the program or not.

Limit main run variable output:

It is possible to limit the absolute value to be corrected (main run variable output) to the

value stored in the setting data

SD 43350: AA_OFF_LIMIT.

Using the machine data MD 36750: AA_OFF_MODE defines the mode of overlaying

0: Proportional evaluation

1: Integrating evaluation

With system variable $AA_OFF_LIMIT[axis] a directional scan to see whether the offset

value is within the limits is possible. These system variables can be scanned from

synchronized actions and, when a limit value is reached, it is possible to stop the axis or set

0: Offset value not in range

1: Limit of offset value reached in the positive direction

-1: Limit of offset value reached in the negative direction

Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0

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