Functional description
MSM-USM2G-BA-UK-001
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3 Functional description
3.1 Basic set-up of the USM
The series of universal fault annunciators USM is designed for systems networked by Ethernet.
The USM serves for acquisition and indication of alarms that are provided on the galvanic inputs or
through the Ethernet interface from a communication partner (e.g. SCADA system). The alarms are
processed and displayed according to the parameterized reporting sequence.
The fault annunciators are available with 8, 16, 24, 32, 40 or 48 signal inputs. The alarms are aligned
to groups of 8 inputs each on the device front. The closed front panel contains 4 push buttons, bi-
colour LED displays (red / green) and slide-in pockets for the labelling strips. Each fault annunciator
features an internal horn. Additionally, an external horn can be triggered through a function relay.
The annunciator features four change-over relays as integrated function relays. Alarm specific
functions (e.g. collective report or external horn triggering) as well as signalization of any malfunction
through a live-contact can be realized with the function relays.
Two function inputs are available and can be used according to the chosen reporting sequence (e.g.
for external acknowledgement).
The functions that are assigned to the push buttons, function inputs and function relays can be
parameterized individually.
All USM fault annunciators provide a hardware-watchdog and software-monitoring. The fault-free
operation is indicated by an OK-LED and through a relay contact (live-contact).
The parameterisation of the annunciator is done through the integrated web-server with a web-
browser and by uploading of parameterization files. By these means the reporting sequence, input
processing, assignment to collective reports and horn triggering can be defined and protocol
parameters, IP-address and information object addresses can be parameterized. A detailed
descripition of the parameterization can be found in the section “Parameterisation”. Customised
special reporting sequences can be realized ex-factory upon request.
The fault annunciator USM provides different interfaces (USB, CAN, SDP, COM and LAN), which will
be described regarding functionality and usage in the following sections.
3.2 Internal Relays 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 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
3. Triggering of the relay from the IEC interface
The 8 relays of one board have one common root. Triggering and functionality can be adapted
individually by means of the parameterization interface on the web-server, e.g. inversion of the signal
or wipe duration for pulse commands.
Additional explanations to the integrated alarm sequeces can be found in the
separate document „
Alarm sequences of EES-Fault annunciators
“
(SM-MA-ZI-UK).