2
Product description
Festo – GDCP-CMMO-ST-EA-SY-EN – 2017-05c – English
33
2.5.2
Homing
When homing, the reference point of the dimensional reference system is determined. The reference
point is the absolute reference point for the axis zero point. Orders cannot be started if homing has
been completed successfully (exception: jogging).
Note
The reference point is saved temporarily in the motor controller. When there is an open
circuit in the logic power supply, the homing point is lost.
Homing must be carried out in the following cases:
–
during initial commissioning of an actuator
–
after every time the logic power supply is switched on
–
after a change in homing method
–
after changing between closed-loop control and open-loop control mode
–
after a reversal in the direction of rotation
Recommendation for repeating the homing operation:
–
after system faults during which the homing point can be lost
–
after a step loss during open-loop operation
Start the homing run
Device control
Start function
Profile
FCT
FCT online tab “Homing”
Valve, binary
Web servers
“Parameters” website
Valve
I/O interface
DIN8 (REF)
Valve
DIN1…DIN5 (RECORD 0) + DIN6 (START)
Binary
Tab. 2.24
Start homing
Automatic start for homing
Start option
Description
Profile
–
active
Automatic homing is performed automatically if the
axis is not already referenced when starting a set of
commands. After homing is completed, the active
set of commands is executed. If the set of com
mands is inactive during the homing process, the
homing process is terminated.
Valve
–
Inactive
Reference travel (homing) is not carried out auto
matically (factory setting):
Tab. 2.25 Automatic start
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FCT [...][Axis][Homing] Settings