Rockwell Automation 4100 ALEC AXIS LINK ENCODER CONVERTER - Manual (Page 46)

Publication 4100-5.3 - June 1999
38 Fault Indication & Control Status
cause other control devices to work erratically which could cause
machine damage or personal injury.
AxisLink Fault
The ALEC indicates AxisLink faults by a RED AL LED. In a fault
condition, there have been at least 256 link errors and AxisLink has
shut down. If this condition occurs, the ALEC must be reset by
pressing the Reset button on the front panel or cycling power. Before
pressing the Reset button or cycling power make sure that all
applications that may be affected are stopped.
AxisLink Failing
When the AL LED flashes Red and Green, AxisLink is in danger of
going offline. This situation indicates that there have been at least 96
link errors and is in danger of shutting down. This is usually caused
by an intermittent cabling problem, excessive noise, improper cable
termination, or a failing AxisLink module. When this situation occurs,
AxisLink is still working but it could fail at any time.
If the application program in a motion controller on AxisLink is not
running, that motion controller attempts to re-establish the failing
links. It is possible that the failing condition can be corrected by itself
if the source of the problem is corrected in time. If the application
program is running, the controller does not attempt to re-establish the
failing links
−
this must be done by the fault handling routine in the
program.
If the failing links do not correct themselves you may have to shut the
application down. Care should be taken to end the session before it
moves to a fault state and shuts down on its own. Bring your session
to a safe stop and check the cabling, noise levels, and AxisLink
module before continuing. Call Tech Support if you have problems
determining the cause of the failing situation.
ATTENTION
!
Pressing the Reset Button on the ALEC can result in
erratic behavior in other attached control devices. This
can create a dangerous situation for both the machine and
the operator.