Appendix B
Motion Connection Accessories
B-4
ni.com
Shutdown (Emergency Stop) Signal to Controller
Only
By default, the EMG jumpers on the MCA-7790M are placed to connect
the EMG input of the drive to isolated ground. In this configuration, the
drive is always enabled. The EMG pin on the Axis I/O screw terminal
cannot be used in this configuration.
The PCI-7390 Axis <1..4> General-Purpose Input 0 is not connected to the
EMG input of the drive. Connect the shutdown (emergency stop) switch or
signal to the PCI-7390 Axis <1..4> General-Purpose Input 0 pin on the
Axis I/O screw terminal. In software, configure the PCI-7390 Axis <1..4>
General-Purpose Input 0 to function as a shutdown (emergency stop) input.
In this configuration, the shutdown (emergency stop) signal goes to the
controller and stops all axes in the motion control system if the shutdown
(emergency stop) signal is active.
Note
If you are not connecting an external shutdown (emergency stop) signal to the drive,
leave the jumpers in the default configuration. This connects the EMG input of the drive to
isolated ground. In this configuration the drive is always enabled.
Combined Shutdown (Emergency Stop) Signal to
Controller and Drive
Place the jumper to connect the EMG input of the drive and the PCI-7390
Axis <1..4> General-Purpose Input 0 signal. This jumper setting shorts the
EMG pin and General-Purpose Input 0 pin together.
Caution
Connect the external shutdown (emergency stop) signal either to the EMG pin or
the PCI-7390 Axis <1..4> General-Purpose Input 0 pin, not both pins. Wiring both pins in
this configuration could cause permanent damage to your motion system.
You can use the EMG pin or the PCI-7390 Axis <1..4> General-Purpose
Input 0 pin on the Axis I/O screw terminal to connect a shutdown
(emergency stop) switch or signal to both the drive and the controller. In
software, configure the PCI-7390 Axis <1..4> General-Purpose Input 0 to
function as a shutdown (emergency stop) input.
Note
The drive is enabled (normal operation) when the EMG input is connected to
isolated ground.