Siemens SINUMERIK 802D sl Function Manual page 78

Travel to fixed stop (F1)
5.2 Functionality
Interrupts
● If the fixed stop position is not reached when the function is active, alarm 20091 "Fixed
● If a traversing request (e.g. from the part program or from the operator panel) is provided
● If after reaching the fixed stop an axis is pushed out of position more than the indicated
Sequence in case of a fault or abnormal termination
The IS "Activate travel to fixed stop" is reset.
Depending on MD37060 FIXED_STOP_ACKN_MASK, the NC waits for the PLC to
acknowledge by resetting IS "Activate travel to fixed stop". The torque limitation is then
cancelled and a block change executed.
Deselection
The NC detects deselection of the function on the basis of command FXS[x]=0. Then, a
preprocessing stop (STOPRE) is initiated internally, since it can not be foreseen where the
axis will be after deselection.
The torque limitation and monitoring of the fixed stop monitoring window are cancelled. IS
"Activate travel to fixed stop" and "Fixed stop reached" are reset.
Depending on MD37060 FIXED_STOP_ACKN_MASK, the NC waits for the PLC to
acknowledge by resetting IS "Activate travel to fixed stop" and /or "Acknowledge fixed stop
reached".
The axis will then change to position control. The followup mode of the position setpoints is
ended and a synchronization to the new actual position is carried out.
A programmed traverse motion must then be executed. This motion must lead away from the
fixed stop or else the stop or even the machine may sustain damage.
A block change is executed after the target position has been reached.
Multiple selection
A selection may only be carried out once. If the function is called once more due to faulty
programming (FXS[axis] = 1), the alarm 20092 "Travel to fixed stop still active" is initiated.
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stop not reached" is output and a block change executed.
for an axis after the fixed stop has been reached, the alarm 20092 "Travel to fixed stop
still active" is output and the axis is not moved.
value in SD43520 FIXED_STOP_WINDOW (fixed stop monitoring window), the alarm
20093 "fixed stop monitoring has responded" is output; the "travel to fixed stop" function
is then deselected for this axis and system variable $AA_FXS[x] is set to 2.
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0