User guide

Maintenance
840 USE 115 00 Version 1.0
57
If the
Coll
LED is flashin
g
, the module is reportin
g
collisions on the Ethernet
network. While such collisions are normal, the fre
q
uenc
y
of the flashes is an
indication of the volume of traffic on the network. The flashes ma
y
be so fre
q
uent
that the LED appears to be shinin
g
steadil
y
. Heav
y
traffic will slow communications.
If response time is important to
y
our application,
y
ou should consider se
g
mentin
g
y
our network to reduce the fre
q
uenc
y
of collisions.
6.1.8 Application LED
If the module crashes, it will note the reason in a lo
g
. If the module is able to
recover, the
Appl
LED will li
g
ht, indicatin
g
that an entr
y
has been made in the error
lo
g
. To learn how to read and clear the error lo
g
, refer to the section below.
6.1.9 Readin
g
and Clearin
g
the Error Lo
g
If the
Appl
indicator is lit, entries have been made in the error lo
g
. The lo
g
ma
y
hold
up to 1023 entries. If the error lo
g
is full, the
Fault
indicator will remain on and the
module will be unable to recover until the lo
g
is cleared.
You ma
y
read the error lo
g
while the controller is runnin
g
or stopped, usin
g
the ER-
RLOG utilit
y
. However, if
y
ou plan to clear the error lo
g
,
y
ou must stop the controller
first. Durin
g
the pro
g
ram, ERRLOG will ask
y
ou whether
y
ou want to stop the con-
troller. If
y
ou respond
y
es, it will stop and restart the controller for
y
ou.
To read the error lo
g
, at the DOS prompt in the appropriate director
y
, t
y
pe:
ERRLOG <routing path> <slot> [/d] [/sxx] [/ny]
where
<routing path>
is the Modbus Plus address of the Quantum PLC
<slot>
is the slot number of the Ethernet web embedded server module.
[/d]
is optional, to enable debu
g
messa
g
es. Default is no debu
g
.
[/sxx]
is optional and specifies the software interrupt to use, xx in
hexadecimal. The default is 5c.
[/ny]
is optional and specifies the Modbus Plus adapter number to use,
y
.
CAUTION
PROCESS INTERRUPTION
Do not stop the controller unless it is safe to stop the operations it is controllin
g
. When a
controller is stopped, all operations under its control will also stop.
Failure to observe this precaution can result in injury or equipment damage.