Signal state 1 Follow-up mode is selected for the axis / spindle by the PLC.
The means that
the position setpoint continually tracks the actual value if the
controller enable for the drive is withdrawn.
As soon as the follow-up mode is effective, the interface signal:
DB390x DBX1.3 (follow-up mode active)
is set.
The actual value continues to be acquired and updated. If the axis / spindle
is moved from its current position by an external effect the zero speed and
clamping monitoring do not issue an alarm.
When the closed-loop control system is switched-on again, a control internal
repositioning operation is performed (REPOSA: linear approach with all ax‐
es) to the last programmed position if a part program is active.
Signal state 0 Follow-up mode is not selected (so-called holding).
When "controller enable" is removed the previous position setpoint is kept
in the control. If the axis / spindle is pushed out of position during this time
a following error
occurs between the position setpoint and the position actual
value. This position difference is reduced to zero immediately by issuing
"controller enable" so that the previous setpoint position is restored.
Then, all the other axis movements start from the setpoint position valid
before "controller enable" was removed. When the position control is switch‐
ed in again the axis may make a speed setpoint jump.
Zero speed monitoring or clamping monitoring is still active.
In order to disable (switch-out) the zero speed monitoring, when clamping
an axis, the interface signal:
DB380x DBX2.3 (clamping operation running)
should be set.
Special cases, errors, ... If the drive controller enable is withdrawn inside the control due to faults,
then the following should be carefully observed:
Before an NC
start, after the queued alarms have been successfully deleted
(i.e. inside the control, the controller enable is re-issued), then "holding"
should be activated. Otherwise, for an NC start and selected follow-up mode,
the traversing distance of the previous NC block would not be executed due
to the internal delete distance to go.
Notice:
When changing over from the "follow-up" state to the "hold" state and in the
control mode (a controller enable is issued), a delete distance-to-go com‐
mand is activated in the control. As a consequence, for example, an NC block
- in which only this axis is traversed - is ended directly.
corresponding to ... DB380x DBX2.1 (controller enable)
Note for the reader Function Manual Basic Functions R1
DB380x
DBX1.5 / 1.6
Position measuring system 1 (PMS1) / Position measuring system 2 (PMS2)
Signal(s) to axis / spindle (PLC → NCK)
Edge evaluation: No Signal(s) updated: Cyclic
PMS1: Signal state 1
PMS2: Signal state 0
Position measuring system 1 is used for the axis / spindle (e.g. for position
control, absolute value calculation, display). If a position measuring system
2 also exists
(MD30200 NUM_ENCS = 2), this actual value is also acquired.
PMS1: Signal state 0
PMS2: Signal state 1
Position measuring system 2 is used for the axis / spindle (e.g. for position
control, absolute value calculation, display). If a position measuring system
2 also exists, this actual value is also acquired.
Detailed descriptions of interface signals
5.8 Axis / spindle-specific signals
Parameter Manual
408 Parameter Manual, 08/2015, 6FC5397-8EP40-0BA1
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