6.0 Reference - Home / Limit switches
Although the system can operate without reference sensors ( Home /
Limit ), they are worth using for several reasons. Firstly, they allow a
reference run to be made, which enables the system to determine the exact
position of each axis. This makes it easy to resume operation after a
possible failure (power failure, lost steps, etc.). A second advantage is the
hardware protection against exceeding the operating range of an axis.
Both functions ( Home / Limit ) use a common input ( same switch ),
which performs the Home / Limit functions as required.
6.1 Connecting the limit switches
PNP type sensors are NOT SUPPORTED.
The IN inputs are internally pulled up to +24V with a 3.9kR resistor.
Mechanical limiters ( NO or NC contacts) or inductive limiters with
NPN NO or NPN NC output can be connected to the system.
It is possible to connect limit sensors protecting both sides of one
axis - for this purpose it is sufficient to connect both sensors of the NPN
NO type to one input ( in parallel ). For mechanical limit switches, connect
them in parallel if they are NO or in series for the NC type.
( Limit++ must not be wired to slave side/input1)
Examples of securing both sides of an axle :
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