Functional description
MSM-USM2G-BA-UK-001 Page 11 of 45
3.2 Internal Relay cards (optional)
The optionally integrated relay cards (8 NO contacts each) are independent from the 4 function relays
of the annunciator and can be assigned to the following functions:
1. In- or output parallel multiplication and forwarding of single alarms within the annunciator and
without the requirement for connection of external relay modules MSM-RM.
2. Issue of collective reports and triggering of external horn
The 8 relays of one board have one common root. Triggering and functionality can be adapted
individually by means of the parameterization software for the BSM-P, e.g. inversion of the signal. For
BSM-C these functions are fixed assigned.
3.3 Dual power supply (optional)
Independent from the primary power supply, a second, redundant power supply can be integrated into
the fault annunciator. Two different voltage variants are available:
24 – 60 V AC/DC
110 – 220 V AC/DC
The voltage level of the redundant power supply can be chosen independently from the voltage level
of the primary power supply. Both primary and secundary power supply are integrated into the self-
monitoring of the annunciator and any malfunction is indicated on the live-contact. Additionally,
presence of the supply voltage is indicated for both power supplies by an LED on the rear of the
device.
3.4 Cascading of several fault annunciators
With the cascading functionality one BSM or USM and up to 3 BSM (BSM-C or BSM-P) can be
grouped to an annunciating system which is processed as a virtual compound annunciator with
common signalling (reporting sequence, forming of collective reports and horn triggering).
The USM (universal fault annunciator) is comparable to a BSM-P, but additionally provides a
communication interface IEC 60870-5-101/104 or IEC 61850. Through the communication interface of
the USM, signals and alarms of the whole annunciating system can be addressed.
The communication within the annunciating system is done through the integrated CAN-Bus interface.
The devices are connected to each other by means of a patch-cable. The first BSM or USM works as
“master” and the connected BSM-C or BSM-P act as “slave”. Thus a system with up to 192 (4*48)
signals can be realized. When creating an annunciating system, please note that the number of
channels of the USM has to be bigger or equal to the number of channels of the connected BSM
devices.
External MSM relay modules cannot be connected to cascaded annunciators.
The parameterization is done in the master fault annunciator (USM or BSM-P) by
means of the web-server and is distributed automatically to the slave devices.
Further information to the above mentioned USM can be found in the separate
operting manual for USM (MSM-USM2G-BA-UK).
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