Aerotech Automation1 iXR3, Hardware Manual

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2.3.5. End of Travel and Home Limit Inputs
End of Travel (EOT) limits are required to define the end of the physical travel on linear axes. Positive
or clockwise motion is stopped by the clockwise (CW) end of travel limit input. Negative or
counterclockwise motion is stopped by the counterclockwise (CCW) end of travel limit input. The
Home Limit switch can be parameter configured for use during the home cycle, however, the CW or
CCW EOT limit is typically used instead. All of the end-of-travel limit inputs accept 0-24 VDC level
signals. Limit directions are relative to the encoder polarity in the diagnostics display (refer to
Figure
2-25 ).
Table 2-16: End of Travel and Home Limit Pins on the Feedback Connector
Pin # Description In/Out/Bi
12 Clockwise End of Travel Limit Input
16 +5V Power Output
20 Signal Common Output
21 Signal Common Output
22 Home Switch Input Input
24 Counterclockwise End of Travel Limit Input
The active state (High/Low) of the EOT limits is software selectable (by the EndOfTravelLimitSetup
axis parameter).
Figure 2-23 shows the possible wiring configurations for normally-open and
normally-closed switches and the parameter setting to use for each configuration.
IMPORTANT : Use NPN-type normally-closed limit switches (Active High) to provide fail-
safe behavior in the event of an open circuit.
iXR3/XR3 Hardware Manual 2.3.5. End of Travel and Home Limit Inputs
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