DISTRIBUTED I/O
27
EN0B-0090
Table 15. Troubleshooting of Distributed I/O modules.
Modules to the left side
working
Modules to the right
side working
Possible Causes
no
no
•
Power
OFF
•
CPU not working
•
Incorrect
wiring
•
Sliding bus connector on XSL511 not closed properly
•
Defective
hardware
→
contact your Honeywell dealer
yes
no
•
Sliding bus connector on the left side not closed properly
•
Defective
hardware
→
contact your Honeywell dealer
yes
yes
•
Wrong
L
ON
W
ORKS
address (HEX switch setting)
•
Defective
hardware
→
contact your Honeywell dealer
In case of problems, check if the behavior is changed if you:
1.
Push the L
ON
W
ORKS
service button to reconfigure the
Distributed I/O module. The L
ON
W
ORKS
service LED will
light as long as you push the L
ON
W
ORKS
service button.
The hardware is defective if this is not the case.
2.
Switch the power ON / OFF.
3.
Set the HEX switch to an unused address for a few
seconds and select the correct address afterwards. This
procedure will cause a reset of the Distributed I/O module.
Please contact Honeywell if the above actions do not solve
the problem.
Service Pin and LED
A service pin message is sent when
— powering-up or resetting,
— transitioning to the configured/online state, or
— turning the DIP switch.
In the case of a power-up or reset, the service pin message
is delayed a random time between 1 and 5 seconds to avoid
an overload of a network management node receiving these
messages when a large number of Distributed I/O modules
are powered up simultaneously.
The service LED indicates the status of the Neuron® chip.
Normally, the LED will blink a few times during the power-
up/reset phase and then remain off. During normal com-
missioning, the LED will stay on briefly and then flash briefly
before remaining off. The time required for commissioning is
variable, lasting from approximately 10 to 60 seconds, de-
pending upon the amount of network information being down-
loaded from the installation tool and the installation tool itself.
For additional information on LED behavior, see Table 16
and Figure 38.
L
ON
W
ORKS
Service LED L2
This LED is used to diagnose the state of the Distributed I/O
module. In general:
•
The module is applicationless if the LED illuminates con-
tinuously.*
•
The module has an application but it is not configured if
the LED is blinking.
•
The module is running normally if L2 is off.
*Pushing the L
ON
W
ORKS
service button will force a new
commissioning of the module. While commissioning, LED L2
continuously illuminates red for less than 1 minute and then
returns 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. Figure 38 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.
IMPORTANT
In Table 16, the words ”configured”, “unconfigured”,
“application”, and “applicationless” refer only to the
communication layer running on the Neuron® chip and not to
the controller application.
1 sec
1
2
3
4
5
6
7
S
erv
ice
L
E
D B
ehav
io
r
2 sec
3 sec
4 sec
5 sec
Time
(at 10 MHz,
approx.)
Power
applied
to node
Continuous
* Does not scale with the Neuron chip.
Continuous
Continuous
Continuous
Repeated
Repeated*
see table
= ON
= OFF
see table
Figure 38. Service LED behavior.
