Siemens SINUMERIK 840D sl Function Manual page 1573

DB31, ...
DBX2.1
Controller enable
Edge evaluation: No
Signal state 1 Controller is enabled.
The position control loop is closed and the axis/spindle is in closed-loop control.
Feedback:
DB31, ... DBX61.5 = 1 (position controller active)
If the axis/spindle was referenced before resetting the interface signal, the axis/spindle does not have
to be re-referenced after the interface signal is set again. Supplementary condition: The limit frequen‐
cy of the active measuring system must not be exceeded in the meantime.
Note
If the axis/spindle was moved from its position during the time in which the controller enable was not
set, the behavior when the controller enable is set depends on the interface signal "follow-up mode":
● DB31, ... DBX1.4 == 1 (follow-up mode)
● DB31, ... DBX1.4 == 0 (follow-up mode)
Signal state 0 Controller is not enabled.
The behavior when the "controller enable" is removed depends on whether the axis/spindle is sta‐
tionary or traversing at this time:
● Axis/spindle stationary:
● Axis/spindle traverses
Note
The current set position is retained in the control when "Controller enable" is reset and "Follow-up
mode" (DB31, ... DBX1.4 == 0) is not set. If the axis is moved in this state, e.g. manually, the difference
between the set position and the actual position increases constantly (following error). The following
error is suddenly corrected to zero when the "Controller enable" is set (speed setpoint jump).
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Signal(s) updated: Cyclically
Position control is performed at the current position
Position control is performed at the last position before the controller enable is reset
– The position control loop of the axis is opened.
– For DB31, ... DBX1.4 == 1 (follow-up mode) ⇒ position setpoint = actual position value
– The controller enable on the drive is reset
– The following interface signals are reset:
DB31, ... DBX61.5 = 0 (position controller active)
DB31, ... DBX61.6 = 0 (speed controller active)
DB31, ... DBX61.7 = 0 (current controller active)
– The axis is stopped with rapid stop.
– Alarm 21612 "Controller enable VDI signal reset during motion".
– The position control loop of the axis/spindle is opened.
– Independent of the interface signal DB31, ... DBX1.4 (follow-up mode), the position setpoint
is corrected at the end of the braking operation (position setpoint = actual position value) and
the feedback signal DB31, ... DBX61.3 = 1 (follow-up mode) is set.
– The following interface signals are reset:
DB31, ... DBX61.5 (position controller active)
DB31, ... DBX61.6 (speed controller active)
DB31, ... DBX61.7 (current controller active)
Z1: NC/PLC interface signals
19.1 Various interface signals and functions (A2)
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