2.2.4. End of Travel Limits
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. 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
).
Table 2-12:
End of Travel Limit Pins on the Axis Connector
Pin #
Description
In/Out/Bi
3
Signal Common
Output
7
Clockwise End of Travel Limit
Input
8
+5 V Supply (500 mA)
Output
20
Counterclockwise End of Travel Limit
Input
The active state (High/Low) of the EOT limits is software selectable (by the EndOfTravelLimitSetup
axis parameter).
shows the possible wiring configurations for normally-open and
normally-closed switches and the parameter setting to use for each configuration. Use NPN-type
normally-closed limit switches (Active High) to provide fail-safe behavior in the event of an open
circuit.
Figure 2-8:
End of Travel Limit Input Connections
Figure 2-9:
End of Travel Limit Input Schematic
2.2.4. End of Travel Limits
iXI4/XI4 Hardware Manual
38
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