Справочник Пользователя для Omron CS1W-ETN11

The software supported by the Ethernet Unit runs in the layers shown in the
following diagram. The components that form the various layers are defined
below the diagram.

The Version-2.0 Ethernet frame format is used for communications.

Internet Protocol: Transfers datagrams to target nodes using IP addresses.

Internet Control Message Protocol: Supports IP communications by signalling
errors in data transfers.

Address Resolution Protocol: Determines the Ethernet address (i.e., physical
address) by broadcasting based on the target IP address.

User Datagram Protocol: Performs datagram communications. Data resends,
priority control, flow control, and other measures to ensure communications
reliability are not performed for UDP communications, i.e., there is no way of
guaranteeing normal communications without programming special measures
to do so into the user’s application program.

Transmission Control Protocol: Performs communications after establishing a
connection (i.e., a virtual circuit) with the target node to provide a highly reli-
able communications method.

65

31

UNIT
 No.

RUN

ETN11

ERC

SD

RD

ERH TCP FTP

TS

90

2.7

2.7

ETHERNET

NODE
 No.
x16

1

x16

0

01

23456789

ABCD

EF

01

23456789

ABCD

EF

01

23456789

ABCD

EF

CS/CJ-series PC's CPU

Memory Card/
EM File Memory

FINS

FTP server

UDP

TCP

IP

Ethernet (V2.0)

ICMP

ARP

FINS Communication 
Service

Socket
Services

CS/CJ-series PC's CPU Unit

Ethernet Unit

Socket
Services

SMTP

FTP

Mail
transmissions