Rockwell Automation T80020 Application Note Diagnostic Procedures - Manual (Page 70)

Trusted TM
AN-T80020 Diagnostics Procedure
Issue 12 Feb 11 AN-T80020 70
Self Test Cycle Times
The 8000 Series diagnostics tests occur at different intervals. Some faults cause an immediate error,
and some can take hours before they are reported. Many faults are filtered by requiring a number of
successive faults to cause an error, with a test pass decrementing the fault filter counter. Therefore,
some occasional transient faults may be ignored.
Main processor diagnostics are complete in no more than 24 hours. Output module self-tests are
complete in under 1 hour. Input module self-tests are complete in under 30 minutes. These faults
include 6000 series faults. Some faults are reported immediately, including series 2000, 5000, 7000
and all above 8000. Release 3.5 improved the I/O module diagnostic cycle by raising the priority of
failed tests so that they are repetitively tested. Before release 3.5, the I/O module tests took around
four times longer than stated above.
Each test has a set of filter values which govern when a fault is reported. In some cases a fault is
reported on its first detection, but in cases where other conditions may cause a false report, a counter
is incremented by a set number on detecting the fault. If a later test does not detect a fault, the counter
is decremented by a different set number. If the counter exceeds a threshold, the fault is reported as
permanent. Once the fault is permanent, it is reported in the log as such, sets the appropriate fault
LED, and remains until the Reset pushbutton is pressed. This reset will clear all fault reports (below
error code 8000) and set all fault counters to zero. Whilst this may make the system look tidy, it may
also erase important diagnostic evidence.
Tests
Count
Test
interval
P
as
s
F
ai
l
F
ai
l
F
ai
l
P
as
s
Fault Threshold
F
ai
l
F
ai
l
F
ai
l
F
ai
la
nd
la
tc
he
d
P
as
s
F
au
lt
in
cr
em
en
t
P
as
s
de
cr
em
en