Node Controller Overview
General Purpose Digital I/O
Node Controller Hardware User Manual
49
Rockwell Automation Publication MMI-UM013B-EN-P - April 2020
Digital I/O Uses
E-stop Circuit
When using an NC-12 node controller, the digital I/O on the node controller can be connected
directly to an E-stop circuit as shown in
. An E-stop is a user-sup-
plied circuit with a locking button that an operator can press if an emergency situation arises
to halt all motion on the specified paths. When the node controller detects that the E-stop but-
ton is activated, it commands all paths that are associated with that E-stop to suspend vehicle
movement. All motors on those paths suspend vehicle target requests and permissions and all
vehicles come to a controlled stop and are held in position by the motors. Stopping time for
each vehicle is dependent on the mass of the vehicle, including any load, and the acceleration
setting of the current movement command for the vehicle.
Multiple E-stop circuits can be connected to one NC-12 node controller. Each path can then be
configured to be associated with a specific E-stop bit. Any or all paths can be associated with
the same E-stop bit. See the
MagneMover LITE Configurator User Manual
or the
QuickStick
Configurator User Manual
for information on E-stop configuration and use.
NOTE:
An external power supply for the E-stop circuit is required.
An E-stop circuit can have multiple buttons that are wired together in series as shown in
so that pressing any button initiates an E-stop. The same E-stop circuit can be used for
multiple paths that are connected to different node controllers by wiring the E-stop circuit to
each node controller in series as shown in
to a maximum of eight node controllers.
The E-stop must be configured to reference the appropriate Digital Input Bit on each path. The
E-stop is cleared by releasing the button that was pressed and having the host issue a Resume
command.
NOTE:
Motion cannot resume until the button is released and the host controller issues a
Resume command to the paths associated with the E-stop.
CAUTION
High Voltage Hazard
The E-stop is not the same as an EMO (Emergency Off),
which removes power to the transport system.
