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Function - Honeywell BUS-2 Montage, Anschluss, Anleitung

Trennmodul
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Mounting and Connection Instructions -
2.

Function

The separating module BUS-2 is installed between the other BUS-2 users in the bus so that the
bus can be disconnected at this point. If several separating modules are installed in one loop,
parts of the loop can be disconnected.
The separating module has 2 equal BUS-2
connections that, however, are not con-
nected to one another.
The internal monitoring blocks M1 and M2
monitor the operating voltage and the data
signals at both connections for validity. As
soon as a fault occurs, the module
automatically disconnects both lines.
If an error occurs in the bus system (undervoltage, short circuit, missing data signals), the mod-
ules disconnect the bus. The central control unit and the separating modules then check which
modules and users can be put into operation again fault-free so that in the end only the part that is
malfunctioning remains switched off.
- Separating modules in the loop
Random BUS-2 users
A
1
2
BUS-2
B
16
15
The loop without separating modules:
In case of a
short circuit
Separating modules in the loop limit failure to secondary zones.
If separating modules are used according to the above illustration, failure in case of a short circuit at
point " " remains limited to users 7 to 10 (separating modules 1 and 4 closed, separating modules 2
X
and 3 open).
In normal operation, the bus operates only in one direction (in the example A). If an
occurs at point " " in the above illustration, all the following users are disconnected from the bus.
X
The system identifies the interruption and connects the loop from B up to the point of interruption so
that all users are ready to signal again.
The loop is thus fault-tolerant in case of an interruption without separating modules.
- Separating modules in the stub
If separating modules are used in a
where the fault has occurred. In the following example, up to user 6.
1
2
Separating
Separating module 1
3
4
14
13
Separating module 4
at point " ", the
X
complete loop
stub,
the bus continues to function up to the separating module
3
4
Module
BUS-2
Separating module BUS-2
+U_b
Data
BUS-2
connection 1
M1
0 V
Separating module 2
5
6
12
11
Separating module 3
does not function.
5
6
BUS-2
connection 2
EU
M2
X
7
10
interruption
X
7
11
+U_b
Data
0 V
8
9
8

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