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3
HOMING
THE
SMD23/4P
Homing Configurations
An SMD23/4P must have one of its DC inputs configured as the home input before one of the ± Find Home
commands can be issued.
1) You do not have to configure and use CW or CCW Limits. If you choose to configure the
module this way, then the SMD23/4P has no way to automatically prevent overtravel during
a homing operation. You must prevent overtravel by some external means, or ensure that
the homing command is issued in the direction that will result in reaching the homing input
directly.
2) You can use a bit in the Network Output Data as a home proximity input. Using this bit is
completely optional.
Homing Profiles
The +Find Home command is used in all of these examples. The –Find Home command will
generate the same profiles in the opposite direction.
Home Input Only Profile
Figure 3.1 below shows the move profile generated by a +Find Home command when you use the Home
Input without the Backplane Home Proximity bit.
Home Limit
Switch
SPEED
(CW)
POSITION
(CCW)
Figure 3.1 Home Input Profile
1) Acceleration from the configured Starting Speed to the Programmed Speed
2) Run at the Programmed Speed until the Home Input activates
3) Deceleration to the Starting Speed and stop, followed by a two second delay.
4) Acceleration to the Programmed Speed opposite to the requested direction.
5) Run opposite the requested direction until the Home Input transitions from Active to Inactive
6) Deceleration to the Starting Speed and stop, followed by a two second delay.
7) Return to the Home Input at the configured Starting Speed. Stop when the Home Input transitions
from inactive to active.
If the Home Input is active when the command is issued, the move profile begins at step 5
above.
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ADVANCED MICRO CONTROLS INC.