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Chapter 5
Signal Connections
Note
Both limits and home inputs must be enabled to use the Find Home function.
Note
After a Find Home sequence is complete, the home input should be disabled, since
it is no longer required, assuming you do not want to stop at the home position the next
time the system moves past it.
Cautions
located at the forward or positive end of travel and the reverse limit at the negative end of
travel. Failure to do so may result in motion that stops at, but then travels through, a limit,
potentially damaging the motion system. Miswired limits may prevent motion from
occurring at all.
Keep limit and home switch signals and their ground connections wired separately from
the motor driver/amplifier signal and encoder signal connections. Wiring these signals near
each other can cause faulty motion system operation.
7344 Hardware User Manual
Limit and home inputs are a per axis enhancement on the 7344 controllers
and are not required for basic motion control. These inputs are part of a
system solution for complete motion control. All motion control functions
can be operated without limit switches except the Find Home function,
which requires enabled limit and home inputs for operations.
During Find Home function execution, the first active limit signal in the
search direction does not simply stop the motor, but causes motion to turn
around and travel in the opposite direction and continue to search for the
home switch.
Similarly, during Find Home, you can use a home switch to either stop
motion or to begin a predetermined sequence of homing moves to find the
correct edge of the home switch and to approach it from the desired
direction.
Wiring Concerns
For the end of travel limits to function correctly, the forward limit must be
Limit and Home Input Circuit
Figure 5-2 shows a simplified schematic diagram of the circuit used by the
limit and home switch inputs for input signal buffering and detection.
5-6
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