terminals. The controller switches between the V1 and V2 terminals without
affecting operation.
Caution
The C terminals are internally connected to each other. If you use two
power supplies, ensure that they share a common ground.
Caution
The C terminals are internally connected to the controller 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 provides built-in reversed-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 in to the controller or while the power supply
is on.
Powering On the Controller
When you apply power to the CompactRIO system, the controller runs a power-on self test
(POST). The Power and Status LEDs turn on briefly. When the Status LED turns off, the
POST is complete. If the LEDs do not behave in this way when the system powers on, refer to
the information in this document about understanding LED indications.
Understanding LED Indications on the
Controller
The following figure shows the LEDs on the cRIO-9024.
Figure 11.
LEDs on the cRIO-9024
1 2 3 4
1. POWER
2. FPGA
3. STATUS
4. USER1
POWER LED
The POWER LED is lit while the cRIO-9024 is powered on. This LED indicates that the
power supply connected to the controller is adequate.
FPGA LED
NI Condition Monitoring Systems do not use the FPGA LED.
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Maintaining NI CMS-9024 Hardware for an NI InsightCM System