Software Configuration - Mitsubishi MELSEC-F User Manual

1 OVERVIEW

1.3 Software Configuration

Personal computer/work-station(example)
User program
System call
Socket
TCP UDP
ICMP
IP
ARP
Ethernet
(100BASE-TX, 10BASE-T)
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The Ethernet modules support the TCP/IP and UDP/IP protocols.
Communication
using fixed buffers
(100BASE-TX,10BASE-T)
(1) TCP (Transmission Control Protocol)
This protocol guarantees data credibility and reliability in communication between
a personal computer/work station and PLC that are connected via network, and
provides the following functions:
• Creates a logical connection by establishing a connection (logical line) as if a
dedicated line was created between external devices.
• A maximum of 8 connections can be established and communicated to at the
same time in the Ethernet module.
• Data reliability is maintained by the sequence control using the sequence
numbers, the data retransmission function and the check sum.
• The communication data flow can be controlled by operations using Windows.
PLC
Main Unit
From/To instruction
Buffer memory
Communication
Communication
using the MC protocol
by e-mails
SMTP
POP3
DNS
TCP/UDP
ICMP
IP
ARP
Ethernet
MELSEC-F
OSI reference model corres-
ponding to the PLC configuration
(Layers)
PLC
7 Application layer
6 Presentation layer
5 Session layer
Ethernet
module
4 Transport layer
3 Network layer
2 Data link layer
1 Physical layer
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