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Glossary
258
SICAM MMU 7KG9663, Device Manual
E50417-H1040-C514-A3, Edition 01.2016
H
Holding register
Area for representing data in Modbus communication
I
IEC
I
nternational
E
lectrotechnical
C
ommission, standards organization; Com-
munication standard for substations and protection equipment
IEC 60870-5-104
Type of protocol for the data transmission via Ethernet interface RJ45
IED
I
ntelligent
E
lectronic
D
evice
Indication off
The status of the indication changes from ON to OFF, that is the indication
is deleted.
Indication on
The status of the indication changes from OFF to ON, that is the indication
is currently present.
+Inf
Stands for
Infinity
and denotes a counter overflow. Extremely large number
or infinitely positive number
IOA
I
nformation
O
bject
A
ddress (at IEC 60870-5-104)
IP
I
nternet
P
rotocol
IP address
Addresses in computer networks based on the Internet protocol
J
JavaScript
Script language mainly used by Web browsers
K
KeepAlive
KeepAlive on TCP level is a feature intended to verify the availability and
functioning of the communication partner (client) and to maintain a TCP net-
work link if the network is inactive.
The server sends KeepAlive messages (TCP packets without data) to the
client in regular intervals (KeepAlive time) while the network is inactive, and
the client responds to these messages.
If the client does not respond to a KeepAlive message, the server assumes
that the link is down or the client is inactive and closes the TCP link.
L
LED
L
ight-
E
mitting
D
iode
Limit violation
A value exceeding or falling under a parameterized limiting value.
LSB
L
east
S
ignificant
B
it
SICAM-MMU_7KG9663_US.book Page 258 Monday, December 7, 2015 12:22 PM