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Siemens SINUMERIK 840D sl Function Manual page 1580

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Z1: NC/PLC interface signals
19.1 Various interface signals and functions (A2)
DB31, ...
DBX61.5
Position controller active (status)
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 con‐
troller 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 exam‐
If the position control is active the axis/spindle is kept in position by the position controller.
ple(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The holding brake of a vertical axis must be activated as soon as the position control is no longer
active.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".
Corresponding to ...
DB31, ... DBX2.1 (controller enable)
DB31, ... DBX1.4 (follow-up mode)
DB31, ... DBX1.5 and 1.6 (position measuring system 1 and 2)
Additional references Diagnostics Manual
DB31, ...
DBX61.6
Speed controller active (status)
Edge evaluation: No
Signal state 1
The control signals that the speed controller is closed for the axis or spindle.
Signal state 0
The control signals that the speed controller is open for the axis or spindle.
The speed controller output is cleared.
Application exam‐
If the spindle is not under position control, the interface signal can be used as a feedback for the
ple(s)
interface signal DB31, ... DBX2.1 (controller enable).
Special cases,
The interface signal is also set for simulation axes:
errors, ....
Simulation axis: MD30350 $MA_SIMU_AX_VDI_OUTPUT == 1
Corresponding to ...
DB31, ... DBX61.5 (position controller active)
1580
Signal(s) updated: Cyclically
Signal(s) updated: Cyclically
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions

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