Siemens SIMATIC S7-1500 Function Manual page 138
Update 3
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- System manual (523 pages) ,
- Function manual (362 pages) ,
- Manual (188 pages)
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Configuring
6.6 Configuring the positioning axis/synchronous axis technology object
Zero mark via PROFIdrive frame
Enable direction reversal at the hardware limit switch
Select this check box to use the hardware limit switch as a reversing cam for the home
position approach. After the axis has reached the hardware limit switch during active homing,
it is ramped down at the configured maximum deceleration rate and the direction is then
reversed. The zero mark is then sought in the reverse direction. If this function is not enabled
and the axis reaches the hardware limit switch during active homing, then the drive is
disabled and braked with the ramp configured in the drive.
Homing direction
Select the direction in which the next zero mark should be approached for homing.
"Positive" is the homing direction in the direction of positive position values; "negative" in the
direction of negative position values.
Approach velocity
In the "Zero mark via PROFIdrive frame" homing mode, the approach velocity for traversing
the home position offset is used.
Homing velocity
In this field, specify the velocity at which the axis approaches the zero mark for homing.
Home position offset
In the case of a differing zero mark position and home position, enter the corresponding
home position offset in this field. The axis approaches the home position at approach
velocity.
Home position
In this field, configure the absolute coordinate of the home position. The home position
configured here is in effect, when the Motion Control instruction "MC_Home" is executed with
Mode = 5.
Homing mark via digital input
If a digital input is used as a homing mark, the accuracy of the homing process is not as high
as with hardware-supported homing using zero marks.
You can improve the accuracy by using a low homing velocity and a timer-supported input
module.
Pay attention to the setting of short filter times at the digital input as well.
138
S7-1500 Motion Control V13 Update 3
Function Manual, 07/2014, A5E03879256-AC
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