TELEDYNE OLDHAM SIMTRONICS Everywhereyoulook BM 25A, Руководство пользователя

Страница: 37 / 72

BM 25A/AW
AREA GAS MONITOR
USER MANUAL
NPB25AEN
Revision D.0
29
4.2.2 Removing a BM 25AW from an existing network
In BM 25 mode
•
turn the unit off
•
or deactivate the radio module from the maintenance menu.
In both cases, before communication stops, the BM 25AW broadcasts a last message to inform
the other BM 25AWs on the same network that it will be removed.
In Controller mode
To remove a BM 25AW from an existing network, just switch the controller channel off, then
turn the BM 25AW off or deactivate the radio module if you still need to use the BM 25AW in
local.
4.3 Self-healing
NOTE : This section covers the ‘
BM 25’ mode only.
Each BM 25AW broadcasts a message every 10 seconds. Using the example shown below, if
BM 25AW tag A receives no message from BM 25AW tag B for more than 2 minutes, then B is
considered as missing by A which turns into fault mode (case No. 2 – Table of alarms) and
transfers the information to all other BM 25AWs on the network. Note that BM 25AW tag B
can act the same if it receives no information from A. Number of BM 25AWs that do not
communicate anymore is displayed on each BM 25AW referring a communication fault. This
number may differ depending on the BM 25AW you are looking. Here below, one BM 25AW
out of four is no longer communicating.
Figure 28 : One BM 25AW out of four does not communicate
In case of communication failure, the network tries to reestablish communication every ten
seconds.
In
BM 25 mode, if a BM 25AW does not respond or if the network is split, then it is possible to
ignore this fault and to continue to work by the time of the restoration of the network.