Functional description
3 Functional description
3.1 Basic set-up of the USM
The USM family of universal fault indicators was developed for systems networked with Ethernet. The
fault indicators are used to record and display alarms that are provided by the communication partner
(e.g. control system) via galvanic inputs or via the Ethernet interface. The alarms are processed and
displayed according to the parameterized fault alarm sequence. In addition, the alarms can be
forwarded to higher-level systems via the integrated interfaces and protocols.
The fault indicators are available with 8, 16, 24, 32, 40 or 48 signal inputs. The signal inputs are
combined in groups of 8 alarms each. The closed front surface up from software level 3.5 contains
4 buttons, 3 status LEDs, one RGB LED for each alarm with which the 6 color variants (red, green,
yellow, blue, orange and white) can be parameterized and pockets for the labeling strips. The
predecessor annunciators were supplied with 2-color LED (red/green).
The fault annunciator has an internal horn. An external horn can be controlled via a function relay.
The two function inputs are used according to the selected signal sequence (e.g. external
acknowledgement). The integrated function relays are designed as changeover contacts. They realize
alarm-specific functions (e.g. collective alarm and control of an external horn) as well as the signaling
of a malfunction by a live contact.
The fault annunciator has a
status memory in case of a power failure
. If the supply voltage fails, all
visual and acoustic signals are switched off and the relays drop out. During the power failure, no new
alarms are registered and acknowledgements are not possible. After voltage recovery, all states are
immediately resumed and the fault annunciator is wide for operating actions and new alarms.
The parameterization 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
description of the parameterization can be fou
nd in the section “
”. Customized 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.
Many energy systems work unmanned at times and only in the event of maintenance or faults is
someone on site. For this purpose, two special functions have been integrated into the fault indicators,
which are indicated as an additional operating mode by green flashing of the alive LED.
Mute function
In the operating mode "mute", the horn is not triggered or is automatically acknowledged after
a parameterizable time. The function is switched on or off with a button that has been
parameterized for this purpose. The operating mode can also be activated via a
parameterisable function input. In this case, the muted mode is only active as long as a
voltage is applied to the input.
Unmanned function
The fault annunciators can be switched between the operating modes "manned station" and
"unmanned station". In the "unmanned station" mode, there is no visual or acoustic output of
pending alarms. The internal alarm processing and, if necessary, the control of relays or the
output via an interface remain active. The alarm acknowledgement on the fault annunciator is
deactivated.
