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Inter relay commu-
nication
IRC combination
Inter Relay Communication, IRC, is used for directly exchanging process information
between SIPROTEC 4 devices. You require an object of type IRC combination to con-
figure an Inter Relay Communication. Each user of the combination and all the neces-
sary communication parameters are defined in this object. The type and scope of the
information exchanged among the users is also stored in this object.
IRIG-B
Time signal code of the Inter-Range Instrumentation Group
Internal single point indication → Single point indication
IS
Single-point indication fleeting → Transient information, → Single point indication
IS_F
ISO 9001
The ISO 9000 ff range of standards defines measures used to ensure the quality of a
product from the development stage to the manufacturing stage.
Link address
The link address gives the address of a V3/V2 device.
List view
The right pane of the project window displays the names and icons of objects which
represent the contents of a container selected in the tree view. Because they are dis-
played in the form of a list, this area is called the list view.
LV
Limit value
LVU
Limit value, user-defined
Master
Masters may send data to other users and request data from other users. DIGSI op-
erates as a master.
Metered value
Metered values are a processing function with which the total number of discrete
similar events (counting pulses) is determined for a period, usually as an integrated
value. In power supply companies the electrical work is usually recorded as a metered
value (energy purchase/supply, energy transportation).
MLFB
MLFB is the abbreviation for "MaschinenLesbare FabrikateBezeichnung" (machine-
readable product designation). This is the equivalent of an order number. The type
and version of a SIPROTEC 4 device are coded in the order number.
Modem connection
This object type contains information on both partners of a modem connection, the
local modem and the remote modem.
Modem profile
A modem profile consists of the name of the profile, a modem driver and may also
comprise several initialization commands and a user address. You can create several
modem profiles for one physical modem. To do so you need to link various initialization
commands or user addresses to a modem driver and its properties and save them
under different names.
7SD5 Manual
C53000-G1176-C169-1
→ IRC combination
Glossary
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