Siemens SINUMERIK 828D Function Manual page 1629

DB31, ...
DBX1.5 - DBX1.6 Position measuring system 1 (PMS1) / Position measuring system 2 (PMS2)
Edge evaluation: No
PMS1: Position measuring system 1 is used for the axis/spindle (e.g. for position control, absolute value
Signal state 1 calculation, display). If a position measuring system 2 also exists
(MD30200 $MA_NUM_ENCS = 2), this actual value is also acquired.
PMS2:
Signal state 0
PMS1: Position measuring system 2 is used for the axis/spindle (e.g. for position control, absolute value
Signal state 0 calculation, display). If a position measuring system 1 also exists, this actual value is also acquired.
PMS2:
Signal state 1
PMS1: As it is not possible to use both position measuring systems simultaneously for the position control
Signal state 1 of an axis/spindle, the control automatically selects position measuring system 1.
If a position measuring system 2 also exists, this actual value is also acquired.
PMS2:
Signal state 1
PMS1: 1. The axis is in the park position.
Signal state 0
PMS2:
Signal state 0
2. The spindle does not have a position measuring system and is only speed controlled.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Signal(s) updated: Cyclic
This means that the following features are valid:
– Both position measuring systems are inactive.
– There is no actual value acquisition.
– The position measuring system monitoring functions are disabled
(among others, cable connection of a measured value encoder).
The reference point has no effect:
DB31, ... DBX60.4/5 (referenced/synchronized) has the signal condition 0
As soon as an axis is parked, the interface signals:
DB31, ... DBX61.5 (position controller active),
DB31, ... DBX61.6 (speed controller active)
and
DB31, ... DBX61.7 (current controller active)
are set to a 0.
After parking has been completed the axis must be re-referenced (reference point
approach).
If interface signals PMS1 and PMS2 are set to 0 while the axis is moving, the axis is stopped
with a ramp stop without the controller enable being internally withdrawn.
This is appropriate for the following situations:
– Spindle encoder no longer outputs a signal above a certain speed (no longer supplies any
pulses).
– Spindle encoder is decoupled mechanically because it would not be able to cope with the
speed.
– The spindle can then continue to run in speed­controlled mode. In order to really bring the
axis/spindle to a stop, the controller enable must always be removed additionally by the PLC.
In this case, the interface signal:
DB31, ... DBX2.1 (controller enable)
should be set to a 1 signal.
Z1: NC/PLC interface signals
19.1 Various interface signals and functions (A2)
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