Connectors, I/O and Schematics
MultiFlex PCI 1000 Series User's Manual
193
Limit Negative Input
signal type
:
Bi-directional optical isolator, 0.25 mA min., 3.0V – 25.0V range
notes
:
explanation
:
The limit switch inputs are used to cause the controller to stop the motion of a servo or
stepper axis when it reaches the end of travel. By default this input is shared by both an
Analog command axis and a Pulse command axis. 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 response to
an activated limit input is not direction sensitive, the axis will be stopped regardless of the
direction it is moving if either limit switch is activated. In Torque mode, the controller will
ignore the activation of a limit input, the axis will continue to move. For I/O systems
operating outside the range of 3V to 25V contact the factory.
There are three modes of stopping (decelerate to a stop, stop immediately, turn off the axis) that can be
configured by the function
MCSetLimits( )
. The limit switch inputs can be enabled and disabled by
MCSetLimits( )
. See the description of
Motion Limits
in the
Motion Control
chapter.
Position Capture (Latch) Input
signal type
:
TTL (buffered by 74LS541)
Active level = Rising edge, (TTL high, > 2.4 volts)
Minimum pulse duration = 100 nano second
Maximum re-trigger frequency = 1 KHz
TTL high level input min. voltage = 2.0V
TTL high level input max. voltage = 5.0V
TTL low level input min. voltage = 0.0V
TTL low level input max. voltage = 0.6V
notes
:
Dual purpose signal, can also be used as a general purpose TTL digital input
explanation
:
Used to initiate the capture of position data. See the description of
Position Capture
in
the
Application Solutions chapter
.
Default Axis Outputs
i
The default configuration for the controller is for an Analog Command axis and
a Pulse Command axis to share opto isolated inputs and open collector drivers.
The user can change any of the default I/O function assignments by using the
I/O Configuration Panel
, described on pages 10 and 165.
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