Connecting to the Controller
MultiFlex PCI 1000 Series User's Manual
59
Sinking Sensor
The controller provides eight optically isolated inputs for monitoring over-travel limit sensors. Bi-directional
optical isolators are used, so the over travel sensors may be either sinking or sourcing devices.
By default each over-travel limit input is shared between an Analog Command axis and a Pulse
Command axis (a Limit + is shared by axes 1 and 5, a Limit + is shared by axes 2 and 6, etc...). The
maximum voltage that can be applied to an over travel limit input is 25V. The minimum voltage that will
cause the optical isolator to conduct is 3.0V. The over travel limit sensor must be capable of
sinking/sourcing at least 0.25 mA.
ADAM-3968
wiring module
29
63
Axis 1/5 Limit +
J1
J2
29
Motion Controller
+5 VDC
Axis 1/5 Limit + return /
supply
63
Axis 1 Limit
+
Normall
y Closed
4.7K
4.7K
J3
29
63
Figure 20. Sinking over travel limit sensor wiring example
i
This example uses Normally Closed switches for Fail Safe operation. If the
switch is opened or a wire is broken a change of state will be indicated. To
configure to controller for Normally Closed switches issue the function
MCConfigureDigitalIO( )
with
mode value
=
MC_DIO_LOW
.
i
In Position and Velocity mode the response to an activated limit input is
direction sensitive, the axis will only be stopped if it is moving in the direction of
the activated limit switch. In Contour mode, the axis will be stopped regardless
of the direction it is moving if a limit is activated. In Torque mode, the controller
will ignore the activation of a limit input.
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