Software Configuration - Omron CJ1W-ETN21 - 04-2009 Operation Manual

Specifications
1-4-3

Software Configuration

Socket
services
11. SMTP
5. UDP
1,2,3...
16
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.
CS/CJ-series CPU Unit
FINS communi-
cation service
7. FINS
FINS/UDP FINS/TCP
2. IP
1. Ethernet (Ver. 2.0)
1. Ethernet (Ver. 2.0)
The Version 2.0 Ethernet frame format is used for communications.
2. IP (Internet Protocol)
Transfers datagrams to destination nodes using IP addresses.
3. ICMP (Internet Control Message Protocol)
Supports IP communications by signalling errors in data transfers.
4. ARP (Address Resolution Protocol)
Determines the Ethernet address (i.e., physical address) by broadcasting
based on the target IP address.
5. UDP (User Datagram Protocol)
Performs data communications. Data resends, priority control, flow control,
and other measures to ensure communications reliability are not per-
formed for UDP communications, so the transmitted data may not arrive at
the destination node. To increase reliability, it is necessary to program spe-
cial measures into the user applications.
6. TCP (Transmission Control Protocol)
Performs communications after establishing a connection (i.e., a virtual cir-
cuit) with the destination node, providing a highly reliable communications
service.
7. FINS (Factory Interface Network Service)
A protocol that sends messages between PLCs on any of various OMRON
FA networks. To ensure that transmitted messages arrive at the destination
node, it is necessary to program special measures such as retry process-
ing into the user's applications.
8. FTP (File Transfer Protocol)
Transfers data files.
9. SMTP (Simple Mail Transfer Protocol)
A communications protocol for sending e-mail by TCP/IP.
10. POP3 (Post Office Protocol Ver. 3.0)
A communications protocol for receiving e-mail by TCP/IP.
11. SNTP (Simple Network Time Protocol)
A communications protocol for automatic clock adjustment by UDP/IP.
12. DNS (Domain Name System)
A communications protocol for determining IP address names according
to UDP/IP and TCP/IP.
E-mail
E-mail
Socket
transmis-
reception
services
sion
9. SMTP 10. POP3
6. TCP
4. ARP
3. ICMP
Section 1-4
Memory Card /
EM File Memory
CS/CJ-series
CPU Unit
FTP
8. FTP server
Ethernet
Unit