Technical / Programming Manual
FT128 Rev 2.2
93
(ISO no. 1 / sequence no. 1) will be re-enabled, if this is possible, and so on. The
isolator just before a short circuit cannot be re-enabled.
The control unit algorithm will now try to re-enable the first isolator in the B-direction
(ISO no. 3 / sequence no. 3 in Figure 16). If this is possible, the next isolator in the
B-direction will be re-enabled, and so on.
Finally all isolators will be re-enabled except the isolator on each side of a short
circuit and any isolator(s) between two or more breaks on the loop.
Communication will be in both directions for 10 minutes. Then a new “cycle” starts.
If the “fault(s)” are not corrected, the communication will be in both directions for
another 10 minutes when a new “cycle” starts, and so on.
If the “fault(s)” are corrected, the communication will return to be in the A-direction
only.
Depending on if it is too low voltage on the loop, short circuit, one break or two or more
breaks, the fault messages will be different.
FAULT: Cut-off SCI nn <-> SCI nn
nn = A, 00, 01, 02, 03, 04, 05 - - up to 63 or B.
FAULT: Short circuit SCI nn <-> SCI nn
nn = A, 00, 01, 02, 03, 04, 05 - - up to 63 or B.
If there are multiple loop faults, i.e. one or more short circuits and/or one or more Cut-offs,
there will be a “multiple COM loop fault” message.
FAULT: Several faults on COM-loop
The first fault message will show the first fault in the A-direction.
There will always be a “no reply” message for all units not found in spite of communication
in both directions.
FAULT: No reply xx-xx
FAULT: No reply techn address xxx
Regarding Fault acknowledge, see the FT128 Operation Manual.
Note: After the faults are acknowledged it can take up to 10 minutes before the faults will
disappear from the fault list, since the check ("cycle") starts every 10th minute.
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