Siemens SINUMERIK 840C - Manual (Page 1020)

12.93 12 Functional Descriptions
12.24.2 Functional description
Deselection
The NC detects that the function has been deselected through the programming of G220. In
this case, the interface signals "Travel to fixed stop active" and "Fixed stop reached" are
reset.
The axis switches to position control.
If a traversing motion is programmed in the deselection block, it must be noted that the end
position of the axis deviates slightly from the programmed position. The setpoint and actual
positions can be made to coincide through renewed programming of the axis.
Notes:
As soon the "Travel to fixed stop" function has been activated for an axis/spindle, the
axis/spindle can not be included in any interpolation grouping (2D/3D interpolation, ELG,
synchronous spindle, etc.) until the function has been deselected again.
Spindles must be switched to C-axis mode before the function is selected; they are treated in
the same way as rotary axes by the NC.
CAUTION
The "Travel to fixed stop" function remains active even after RESET.
It is not deactivated on the drive side until an EMERGENCY STOP
command is issued. It must be ensured the no dangerous machine
situations can occur after the function has been deactivated by
EMERGENCY STOP.
12.24.3 Travel to fixed stop with analog drives
The following drive actuators can be used in conjunction with the "Travel to fixed stop"
function:
• SIMODRIVE 611A feed drives for axes. No particular hardware or software versions of this
system are required in this case.
• SIMODRIVE 611A MSD or SIMODRIVE 660 for spindles. Please note: It must be possible
to deactivate the actuator alarm F11 (Speed controller at limit) in these actuators.
12.24.4 Travel to fixed stop with fixed clamping torque
(torque limitation via terminal 96)
This function can be implemented for
• axes in combination with the SIMODRIVE 611A drive actuator and for
• spindles with actuators of type SIMODRIVE 611A MSD or SIMODRIVE 660.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 12–245
SINUMERIK 840C (IA)