Siemens SINUMERIK 840D sl Function Manual page 20

Detailed description
2.1 NC/PLC interface signals
DB31, ... DBX1.3 == 1 (axis- / spindle disable).
The traversing request is maintained. If the axis disable is cancelled when a traversing
request is pending DB31, ... DBX1.3 = 0 the movement is carried out.
Axis disable when machine axis in motion
When machine axis is in motion and NC/PLC interface signal DB31, ... DBX1.3 == 1 the
movement of the machine axis is decelerated to a standstill via the axis-specific brake
characteristics currently active or, if it is part of an interpolated path movement or coupling, it
is decelerated on a path or coupling-specific basis.
The movement is continued if the axis disable is canceled by another pending traversing
request: DB31, ... DBX1.3 = 0.
Spindle disable
The response is determined by the current spindle mode:
• Control mode: Speed setpoint = 0
• Positioning mode: See above "Axis disable".
DB31, ... DBX1.4 (follow-up mode)
"Follow-up mode" is only effective in conjunction with the NC/PLC interface signal:
DB31, ... DBX2.1 (servo enable)
DB31, ... DBX2.1
1
0
0
Function: Follow-up
During follow-up, the setpoint position of the machine axis is continuously corrected to the
actual position (setpoint position = actual position).
The following interface signals have to be set for the follow-up function:
DB31, ... DBX2.1 = 0 (servo enable)
DB31, ... DBX1.4 == 1 (tracking mode)
Feedback:
DB31, ... DBX61.3 = 1 (follow-up mode active)
Note
When the servo enable is set from follow-up mode, if the part program is active, the last
programmed position is approached again internally in the NC (REPOSA: Approach along line
on all axes). In all other cases, all subsequent movements start at the current actual position.
During "follow-up", clamping or zero-speed monitoring are not active.
14
DB31, ... DBX1.4 Function
Ineffective Normal operation (machine axis in closed-loop control
mode)
1 Followup
0 Hold
Basic logic functions: Various NC/PLC interface signals and functions (A2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0