Siemens SENTRON PAC5100, Руководство по эксплуатации устройства, Страница: 262 / 266

262 SENTRON PAC5100/5200, 7KM5212/5412, Device Manual
E50417-H1040-C568-A1, Edition 03.2015
G
Gateway Enables networks based on different protocols to communicate with each
other
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
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
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
M
MAC-Address M edia A ccess C ontrol address: Hardware address that clearly identifies the
device on the network.
MBAP M od b us A pplication P rotocol
MBAP Header Header of a Modbus TCP message consisting of these 4 parts: Transaction
identifier (2 bytes), protocol identifier (2 bytes), length (2 bytes), unit identifier
(1 byte).