Siemens SINUMERIK 840D sl Function Manual page 1579

DB31, ...
DBX61.3 Follow-up active (feedback)
Edge evaluation: No
Signal state 1 The control signals that the follow-up mode for the axis/spindle is not active.
Requirements for this are:
● The controller enable for the drive has been withdrawn (either by the PLC with "controller enable
● Follow-up operation is selected (either by the PLC with IS "follow-up operation" = 1 signal or in
The position setpoint continually tracks the actual value while the follow-up mode is active.
Zero speed and clamping monitoring are not active.
Signal state 0 The control signals that follow-up mode for the axis/spindle is not active.
Zero speed and clamping monitoring are active.
This means that the requirements specified above are not fulfilled.
In the "hold" state, the interface signal:
DB31, ... DBX61.3 (follow-up active)
is 0.
Special cases, Notice:
errors, .... A delete distance-to-go is triggered internally in the control on transition from "Follow up" to "Hold"
(IS "Follow-up mode" = 0) or in the closed-loop control mode (IS "Controller enable" = 1).
Corresponding to ... DB31, ... DBX2.1 (controller enable)
DB31, ... DBX1.4 (follow-up mode)
Additional references Diagnostics Manual
DB31, ...
DBX61.4 Axis/spindle stationary (n < n
Edge evaluation: No
Signal state 1 The current speed of the axis or the actual number of rotations of the spindle lies below the limit given
by the machine data:
MD36060 $MA_STANDSTILL_VELO_TOL
(maximum velocity/speed for signal "Axis/spindle stationary").
Signal state 0 The current velocity of the axis or the actual spindle speed is greater than the value specified in the
MD (standstill range).
If a travel command is present, e.g. for a spindle, then the signal is always = 0 - even if the actual
speed lies below that specified in MD36060.
If the interface signal:
DB31, ... DBX61.4 (axis/spindle stationary)
is signaled and there is no closed-loop position control active for the spindle, then at the MMC, an
actual speed of zero is displayed and with the system variable $AA_S[n] zero is read.
Application exam‐ Enable signal for opening a protective device (e.g. open door).
ple(s)
The workpiece chuck or the tool clamping device is only opened when the spindle is stationary.
The oscillation mode can be switched-on during gear stage change after the spindle has been braked
down to standstill.
The tool clamping device must have been closed before the spindle can be accelerated.
Corresponding to ... MD36060 $MA_STANDSTILL_VELO_TOL
(maximum velocity/speed for signal "Axis/spindle stationary")
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Signal(s) updated: Cyclically
" = 0 signal or inside the control for faults; refer to the references)
the control, e.g. when withdrawing the controller enable from an axis that is moving)
min
Signal(s) updated: Cyclically
19.1 Various interface signals and functions (A2)
) (status)
Z1: NC/PLC interface signals
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