CV500ETN01 Omron, CV500ETN01 Datasheet - Page 141

• Manufacturer Part Number: CV500ETN01
• Description: Programmable Logic Controller
• Manufacturer: Omron

Specifications of CV500ETN01

• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

FINS/UDP Method
6-2
6-2-1
FINS/UDP Features
FINS/UDP Frame Format
116
FINS/UDP Method
Overview
The FINS/UDP method is a FINS communications method that uses the UDP/
IP protocol. UDP/IP is a connectionless communications protocol. When a
message is sent from one node to another, the two nodes have an equal rela-
tionship and there is no clear connection. If using TCP is like making a tele-
phone call, then UDP is more like delivering a memo by hand. Although the
UDP protocol is fast, data communications are less reliable than with TCP.
In particular, when sending large amounts of data involving significant routing,
the user must program measures, such as retries, into applications in order to
improve reliability.
The FINS/UDP method has the following features:
The following diagram shows the structure of a UDP packet used for sending
and receiving data on an Ethernet network.
As the diagram shows, a nested structure is used with the FINS/UDP method,
i.e., Ethernet Ver. 2, IP frame, UDP frame, and FINS frame. A UDP data sec-
tion (FINS frame) that exceeds 1,472 bytes is split into packets for transmis-
sion. The split UDP data is then joined automatically at the UDP/IP protocol
layer. There is normally no need to pay attention at the application layer to this
split, but it may not be possible to send 1,472-byte UDP packets over an IP
network with multiple layers. When using the FINS communications service in
a system such as this, select the FINS/TCP method.
• Because FINS/UDP is a connectionless protocol, there is no limit to the
• FINS/UDP can be used for broadcasting.
• When data is sent via an IP network with multiple layers (such as the
number of corrections.
Internet), communications reliability drops.
Ethernet Ver. 2
Node
Data is sent in one direction, with no
confirmation of whether the data was
received. Because there are few procedures
involved, data can be sent at high speed but
with less reliability than with TCP.
IP
UDP
Data transmission 2
Data transmission 1
Data transmission 3
UDP packet
FINS frame
Node
Section 6-2
FCS