Intelligent Technologies (IT.) QSNAP
Pub. No. MN05001001E 13
February 2002
Status LED
The status LED is located on the lower right of the QSNAP as pictured in Figure 1: QSNAP
Features. The LED’s status changes depending on the state of the QSNAP.
The following table lists the IT. QSNAP LED statuses and describes the meaning of each state.
Table 14: Status LED
Truth Table
Table 15: QSNAP Truth Table
–= state not important RUNNING 1 = Run/FWD/SLOW
1 = state true (energized) RUNNING 2 = REV/FAST
0 = state false (de-energized) FAULT = GND FLT and/or OL TRIP
WARNING = Running Current > FLA but not tripped
State LED Behavior
No Power OFF
Power-Up Routine OFF – CRC corrupt
Waiting for a member ID,
power-up OK (mostly off)
Received a member ID,
off-line (slow blink)
On-line (mostly on)
Faulted (fast blink)
Identify device (burst)
Old State
Fieldbus Inputs
Event New State ActionRun 1 Run 2 Reset
FAULTED ––1 RESET OFF FAULT = 0 READY = 1
OFF 0 0 –NONE OFF NONE
OFF 1 0 –RUN 1 RUNNING 1 RUNNING 1 = 0
OFF 0 1 –RUN 2 RUNNING 2 RUNNING 2 = 0
RUNNING 1 1 1 –RUN 2 RUNNING 1 NONE
RUNNING 2 1 1 –RUN 1 RUNNING 2 NONE
RUNNING 1 1 1 –RUN 1 removed RUNNING 2 RUNNING 1 = 0, RUNNING 2 = 1
RUNNING 2 1 1 –RUN 2 removed RUNNING 1 RUNNING 1 = 1, RUNNING 2 = 0
RUNNING 1 1 0 –FAULT OFF RUNNING 1 = 0 READY = 0
RUNNING 2 0 1 –FAULT OFF RUNNING 2 = 0 READY = 0
RUNNING 1 1 0 –WARNING RUNNING 1 RUNNING 1 = 1 WARNING = 1
RUNNING 2 0 1 –WARNING RUNNING 2 RUNNING 2 = 1 WARNING = 1