Panasonic Electric Works Nordic AB
MEW01351
Rev: -
Planning Instructions Fire alarm system EBL512 G3, V1.1.x
23
Since not all COM loop units are found by the control unit, the
communication starts in the B-direction also.
Since it is not a single break, all units will not be found by the
control unit. A fault will be generated for each unit not found and
one or more fault messages will be shown in the display:
FAULT: No reply xxx-xx
Technical number xxxxxx
Each 10
th
minute a new attempt is made to communicate in the A-
direction only. When the breaks are repaired / corrected, the
communication starts again in the A- direction only, within 10
minutes.
Regarding Fault acknowledge, see the EBL512 G3 Operating
Instructions MEW01163.
Short circuit
on a COM loop
The following will happen:
Since the COM loop current will be too high, the communication
will be stopped and the COM loop will be disabled.
A fault will be generated and a fault message shown in the
display:
FAULT: Short-circuit SCI nn <-> SCI nn,loop
x, control unit xx
NOTE!
nn
= A, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12,
13, 14, 15 or B.
Each 10
th
minute a new attempt is made to re-enable the COM
loop. When the short circuit is repaired / corrected, the
communication starts again in the A-direction only, within 10
minutes.
Regarding Fault acknowledge, see the EBL512 G3 Operating
Instructions MEW01163.
NOTE!
If one or more Addressable short circuit isolators (4313) are
used
4
, the loop will be divided into "segments" (i.e. the part between
two short circuit isolators or between the control unit and one short
circuit isolator). Only the affected segment will be isolated, which
will minimise the number of units disabled by a short circuit.
The fault messages will also show between which isolators the short
circuit or the double breaks are situated, e.g.:
FAULT: Short-circuit SCI 02 <-> SCI 03,
loop
0, control unit 00
If no addressable short circuit isolator (4313) is used, the whole COM
loop will be disabled and the fault message will be (e.g.):
FAULT: Short-circuit SCI A <-> SCI B, loop 0,
control unit 00
4
One short circuit isolator per 32 alarm points is required according to
EN54-2.
