National Instruments Fieldpoint CFP-2220 - Manual (Page 20)

cFP-2200/2210/2220 20 ni.com
Note The controller indicates which terminal it is using on the channel called Power
Source in software. A value of 0 indicates V2, and a value of 1 indicates V1. This behavior
is different from that of older Compact FieldPoint controllers. If your application uses
input from the Power Source channel, you must change your application to reflect the
change in channel behavior. You can either make the change in software or connect the
primary power supply to V2 and a backup power supply to V1.
Caution The C terminals are internally connected to each other. If you use two power
supplies, make sure that they share a common ground.
Caution The C terminals are internally connected to the controller chassis to prevent a
faulty ground connection from causing the chassis ground to float. If you reverse the input
voltage, the positive input voltage is connected directly to the chassis. The controller
has built-in reverse-voltage protection, but reversed voltage can damage connected
peripherals if the chassis ground is not reliably connected to earth ground.
Caution Do not tighten or loosen the terminal screws on the power connector while the
power connector is plugged into the controller or while the power supply is on.
Powering On the cFP-22xx
When you apply power to the cFP-22xx, the controller runs a power-on
self test (POST). During the POST, the Power and Status LEDs turn on.
The Status LED turns off, indicating that the POST is complete. If the
LEDs do not behave in this way when the system powers on, refer to the
Understanding LED Indications section.
You can configure the cFP-22xx to launch an embedded stand-alone
LabVIEW RT application each time you boot the controller. Refer to the
Running a Stand-Alone Real-Time Application (RT Module) topic of the
LabVIEW Help for more information.
Connecting Serial Devices to the cFP-22xx
You can connect devices such as displays or input devices to the serial ports
of the cFP-22xx. Use the Serial VIs to read from and write to the serial ports
from a LabVIEW RT application. If your application is not embedded on
the controller, you must target the cFP-22xx to access the serial ports. Refer
to the LabVIEW Help for information about the Serial VIs and about
targeting the cFP-22xx. Refer to Figure 1 for the locations of the serial
ports.