Siemens 6GA7202-2AA10-1BF1, Руководство по эксплуатации, Страница: 162 / 168

Endian
Data is sometimes saved in a different order in certain computer architectures. Intel-based
computers, for example, save the data differently from the Siemens controllers (S7), namely, in
reverse sequence. The byte sequence from Intel, known as Little Endian, is therefore the reverse
of the S7 byte sequence, Big Endian. It applies to:
• Little Endian: The most significant byte is located at the right-hand end of a word.
This byte contains the highest memory address.
• Big Endian: The most significant byte is located at the left-hand end of a word.
This byte contains the lowest memory address.
Ethernet
This is a specific type of local network that works according to a standard defined by Intel, DEC
and Xerox.
Firmware
Software routines stored in the Read-Only Memory (ROM). Startup routines and local machine
I/O commands are stored in firmware. In terms of user friendliness, firmware takes an
intermediate position between software and hardware.
Function Block Diagram
Function Block Diagram is a graphical representation of control functions. Each control function
has a corresponding symbol.
HW Config
Part of STEP 7 for configuring hardware.
IP address
A 32-bit address to identify a node in an IP network. Each node in the IP network is be assigned
a unique IP address. This consists of the network ID and a unique host ID. This address is typically
represented with the decimal value of each octet separated by a period (e.g. 192.168.7.27). In
this version of Windows, you can configure a static IP address or have it assigned dynamically by
DHCP.
MAC address
The MAC address is the hardware address for each network device (network card, switch, etc.)
and is used for unique identification of the device in the network. The MAC address is burned into
a chip and cannot normally be modified.
Glossary
SIMOCRANE CenSOR
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Operating Instructions, 07/2021