Siemens SICAM Q100 System Manual page 120

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