3VL molded-case circuit breaker
4.2 COM20 connection
3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02
95
4.2
COM20 connection
4.2.1
Data exchange with the COM20
With the COM20, the SENTRON VL circuit breaker can exchange data via PROFIBUS DP
with two masters simultaneously, e.g. class 1 master and class 2 master. This facilitates in
particular the commissioning of parameterization tools and diagnostics tools and of operator
control and monitoring systems (e.g. WinCC) for the SENTRON VL.
DEVICE
PROFIBUS
TRIP UNIT
TEST/
RESET
PRO
FIBUS
-DP
A1(+) 24 V A2(-)
A
B
SPE/PE
(+) ZSI IN (-)
(+) TIE BR (-) (+) ZSI OUT (-)
COM20
(ON) SEO (OFF) L1+
X
WE
24V
X
RELEASE 2
Figure 4-3
PROFIBUS COM20
After configuring and startup, the COM20 communicates with the PROFIBUS class 1 master
via the cyclic message frame. This contains three basic types with variable contents. In
addition, larger data blocks, called data sets, can be requested from the user program (PC
and/or PLC). The pre-assignments in the basic types ensure quick and easy entry/startup.
The PROFIBUS profile shared with the SENTRON WL is described in Chapter PROFIBUS
profile for SENTRON circuit breakers (Page 135), and the data sets are listed in the Chapter
Interlocking and securing
If security considerations demand it, it is possible to lock control/write access to the circuit
breaker via hardware and software using a hardware wire jumper (WE terminal).
For the purpose, for example, of preventing switching via PROFIBUS DP (manual/automatic
mode with connected motorized operating mechanism) or modification of parameters.