Festo Контроллер двигателя SFC-ST - Manual (Page 102)

A. Technical appendix
A−18
Festo P.BE−SFC−DC−PB−S7−E N en 0604NH
A.2.6 Specifying a position directly (Direct mode)
In the status Drive enabled" (Direct mode) a positioning task
is formulated directly in the I/O data which are transmitted
via the field bus. The nominal values for the position are
therefore held in the PLC. The function is used in the following
situations:
ć moving to any position within the work stroke.
ć the target positions are unknown during planning or
change frequently (several different work item positions).
Sequence of discrete nominal value
1. The user sets the desired nominal value (position) and the
positioning condition (absolute/relative) in his output
data.
2. With a rising edge at Start_Positioning_Task the controller
accepts the nominal position and starts the positioning
task.
3. After the start you must wait for MC before a new start
can be made.
4. When the nominal position is reached, MC is set.