EXCEL 50 INSTALLATION INSTRUCTIONS
EN1B-0101
26
L
ON
W
ORKS
Service LED Diagnostics
The L
ON
W
ORKS
service LED is used to diagnose the state of
the Excel 50 controller. In general:
—
The controller is applicationless if the LED illuminates
continuously*
—
The controller has an application but it is not configured
if the LED is blinking
—
The controller is running normally if L2 is off
The L
ON
W
ORKS
service LED is located on the application
module (see Fig. 45).
Pushing the L
ON
W
ORKS
service button will force a new
commissioning of the Excel 50. While commissioning, LED
L2 continuously illuminates red for less than 1 minute and
afterwards return to the normal state (L2 = OFF).
A more detailed diagnosis can be carried out by observing
the duration of the ON and OFF states of the service LED in
connection with power ON / OFF. The following figure
illustrates the different service LED behaviors. These are the
most common behaviors, but others are possible since the
state of the service LED is under firmware control and can be
affected both by hardware and software anomalies.
Fig. 48. L
ON
W
ORKS
Service LED behaviors.
The following table describes each of the behaviors shown in
the previous figure under different contexts. Again, this list is
not exhaustive and therefore does not provide explanations
for every possible service LED behavior.
Table 22. L
ON
W
ORKS
Service LED behavior descriptions.
Behavior
Context
Likely Explanation
1
Power-up of the node
Bad node hardware.
2
Power-up of the node
Bad node hardware.
3
Power-up / Reset of the node
The controller is applicationless. May be caused by the Neuron chip firmware
when a mismatch occurs on application checksums. This behavior is normal if
the application was exported to come up
applicationless
.
4
Anytime
Possible corrupt EEPROM. For a Neuron 3150 Chip-based node, use a newly
programmed PROM, or EEBLANK and follow bring-up procedure.
5
Anytime
The controller is unconfigured.
6
First power-up,
Applicationless
firmware state exported
The OFF duration is approximately 1 second. Service LED should then turn
ON and stay on indicating an applicationless state.
6
First power-up,
Unconfigured
firmware state exported
The OFF duration is 1-15 seconds depending on the application size and
system clock. Service LED should then begin flashing as in behavior 5,
indicating an unconfigured state.
6
First power-up,
Configured
firmware state exported
The OFF duration is indefinite (1-15 seconds to load internal EEPROM; stays
OFF indicating configured state.) The controller is configured and running
normally.
7
Anytime
The controller is configured and running normally.
