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Loops Management
On remote sites, two local outgoing loops (Local user outputs A and B) are activated on the
appearance of a local : equipment alarm or remote indication loops 3 and 4 (Local user input #3
or #4).
The remote loopback function allows an equipment named " central site", to register faults
present on remote sites.
This function requires each site to transmit to the central site an alarm presence message. This
messages which corresponds to remote monitoring loopback 1 or 2 (Local user input #1 or #2)
is transmitted in the S1 byte. To link this message to equipment's alarms, the outputs of the A
and B loops (Local user outputs A and B) should be connected to remote monitoring loops 1 and
2 (Local user input #1 or #2) respectively.
Data chaining in a bus or ring type network architecture is provided by "OR" function validation
between the data received (Far user inputs #1 et #2) via S1 STM1 West and S1 STM1 East, and
local data, for each site in the network.
At the "central site" equipment, "OR" function validation between the data received (Far user
inputs #1 and #2) via S1 STM1 West and S1 STM1 East, and local data (Local user input #1 or
#2 and local alarm), enables local alarm loopbacks to be activated (Local user outputs A and B).
To configure the remote loopback function, the following parameters should be programmed :
"Line remote loopback" and " central site".
The Figure 2-3 gives an example of remote management of the local outgoing loops according
to the equipment connections.
A
WEST
Acivation of local
user inputs
Received
#1 or #2
West S1
folowing activation
of local user
#1
outputs A or B
#2
( équipment
alarms
#3
or local user
#4
inputs #3 rt #4)
ADR 155C 2
Local
user inputs
Figure 2-3 – Remote loopback function (registering alarms on central site)
NOTE : Status of :
- incoming loops (Local user inputs #1 to #4),
- far incoming loops (Far user inputs #1 to #2),
- and outgoing loops (Local user outputs A and B),
may be displayed on HTTP navigator.
No reproduction or communication without the written consent of SAGEM SA
B
Local user outputs
EAST
S1 = state of local user
inputs #1 and #2
A
EAST
Acivation of local
user inputs
#1 or #2
folowing activation
#1
of local user
outputs A or B
#2
( équipment
alarms
#3
or local user
#4
inputs #3 rt #4)
ADR 155C 3
Local user
inputs
A
B
Local user outputs
WEST
#1
Activation of
#2
Local user
#3
inputs #1 or #2
#4
Local
user inputs
Local user outputs
B
WEST
S1 = state of local user
inputs #1 and #2
Installation and User Guide - N56717020101
2 - OPERATION
EAST
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