3VL molded-case circuit breaker
4.2 COM20 connection
3WL/3VL circuit breakers with communication capability - PROFIBUS
98
System Manual, 03/2011, A5E01051353-02
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Figure 4-5
COM20 connection to SENTRON VL
4.2.4
PROFIBUS installation guidelines COM20
The COM20 must be installed in accordance with the installation guidelines for PROFIBUS
DP published by PROFIBUS International (PI, www.profibus.com). Of primary importance
here are equipotential bonding and shielding.
4.2.5
PROFIBUS DP write protection with COM20
In real applications in power distribution, it is necessary to disable write access via
PROFIBUS temporarily or permanently, during maintenance work, for example.
You must ensure remote access is possible for setting the PROFIBUS DP address and the
trip unit values. For this, the inputs WE and 24 V DC (DPWriteEnable) on the COM20 must
be jumpered or closed via a switch.
If this is not the case, no settings can be written to the COM20 and the LCD ETU. In
addition, operation of the motorized operating mechanism via PROFIBUS DP is not possible.