Siemens SINUMERIK 828D Function Manual page 1638

Z1: NC/PLC interface signals
19.1 Various interface signals and functions (A2)
DB31, ...
Axis/spindle stationary (n < n
DBX61.4
Edge evaluation: no
Signal state 1 The current speed of the axis or the actual number of rotations of the spindle lies under the limit
given by the machine data:
MD36060 $MA_STANDSTILL_VELO_TOL
(Maximum speed/number of rotations for signal "Axis/Spindle stationary").
Signal state 0 The actual velocity of the axis or the actual spindle speed is greater than the value specified in the
MD (standstill/zero speed 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 Enable signal for opening a protective device (e.g. open door).
example(s)
The workpiece chuck or the tool clamping device is only opened when the spindle is stationary.
The oscillation mode can be switched-in 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")
DB31, ...
DBX61.5 Position controller active
Edge evaluation: no
Signal state 1 The control signals that the position controller for the axis or spindle is closed.
Signal state 0 The control signals that the position controller for the axis or spindle is open.
If "controller enable" is canceled because of a fault or from the PLC user program the position
controller is opened and therefore the interface signal
DB31, ... DBX61.5 (position controller active)
is set to 0.
Spindle without position control: Signal "Position controller active" is always "0".
See References for other effects.
Application If the position control is active the axis/spindle is kept in position by the position controller.
example(s) Any brakes or clamps can thus be opened.
The interface signal:
DB31, ... DBX61.5 (position controller active)
can be used as feedback signal for the interface signal:
DB31, ... DBX2.1 (controller enable).
The holding brake of a vertical axis must be activated as soon as the position control is no longer
active.
If a spindle has been technically designed/dimensioned for the purpose, in the part program, it can
be changed-over into the closed-loop position controlled mode as spindle or as axis (with SPCON or
M70).
In these cases, the interface signal "position controller active" is set.
Special cases, Special case for simulation axes (MD30350 $MA_SIMU_AX_VDI_OUTPUT = "1"):
errors, .... The IS "position controller active" is also set for simulation axes as soon as MD = "1".
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Signal(s) updated: Cyclic
Signal(s) updated: Cyclic
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions