Glossary
120 SICAM Q100, 7KG95xx, System Manual
E50417-C1040-C522-A8, Edition 09.2020
H
Holding register Area for representing data in Modbus communication
I
ICD file IED Capability Description: Contains the standardized description of the de-
vice configuration
IEC International Electrotechnical Commission, standardization body; Commu-
nication standard for substations and protection equipment
IEC 61850 Type of protocol to the data transmission via Ethernet
IED Intelligent Electronic Device
+Inf Stands for Infinity and denotes a counter overflow. Extremely large number
or infinitely positive number
IP Internet Protocol
IP address Addresses in computer networks based on the Internet protocol
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 Light-Emitting Diode
Limit violation A value exceeding or falling under a parameterized limiting value.
LSB Least Significant Bit
M
MAC-Address Media Access Control address: Hardware address that clearly identifies the
device on the network.
MBAP Modbus Application Protocol
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).
Modbus The Modbus protocol is a communication protocol based on a client-server
architecture.
Modbus RTU Modbus Remote Terminal Unit: Modbus protocol type for transmitting data
over serial networks (for example RS485)
Modbus TCP Modbus Transmission Control Protocol: Modbus protocol type for transmit-
ting data as TCP/IP packets; TCP port 502 is reserved for Modbus TCP.
SYS_SICAM_Q100_US.book Page 120 Thursday, September 24, 2020 1:17 PM
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