Festo Электроцилиндр - Manual (Page 55)

5 Commissioning
Festo – GDCP-CMMO-ST-EA-SY-EN – 1301a – English 55
5.5.2 Properties of the valve profile (7)
Signal pairs
There are signal pairs comprising an input n and an output n, each of which relate to a particular pos-
ition record. The corresponding position record is started by setting the input. The input must remain
active until the specified target is reached. When the target position (MC) is reached, the output is set.
As long as no other input is set, the output remains set even if the input is reset.
Change of position record
If the active input is changed while executing a position record, a change is made to the new position
record continuously without stopping. Sequence when changing a record: First, enable the input of the
new record, then disable the input of the first record(also refer to the timing diagrams).
Following error
If the drive comes up against a physical stop, it uses the parameterised torque to press against the
stop until the input becomes inactive. There is no following error monitoring in the valve profile.
Standstill monitoring
There is no standstill monitoring in the valve profile, i.e. after completion of a position record the drive
can be shifted by external forces without it being reported to the PLC.
– In closed-loop operation the position controller tries to hold the drive in position, but it only does
this up to the maximum peak current that has been parameterised. In critical circumstances use the
PRN variant for relative positioning tasks (positioning relative to the last target position).
– In open-loop operation the drive is held in position with the parameterised holding force. Make sure
that the holding force is sufficient to hold the position.
Automatic homing
A homing run can be executed automatically in the valve profile if the drive is not referenced at the start
of a position record, section 2.7.5.