Specifications

1 - 7
<Ethernet module and communication model>
The following shows the software configuration of the Ethernet module
corresponding to the "OSI reference model".
The Physical and Data link layers correspond to the "Ethernet" part of the Ethernet
module.
The Network and the Transport layers correspond to "IP" and "TCP/UDP" parts of
the Ethernet module.
Much higher layers such as Session, Presentation and Application correspond to
the software part for various functions designed specific to the MELSEC-Q, which
has been realized by combinations of the Q series PLC CPUs and the Ethernet
module.
TCP/UDP
IP
TCP
IP
UDP
ICMP
ARP
CPU
7
6
5
4
3
2
1
Personal computer/work-station
User program
System call
Socket
PLC
Q series PLC CPU
Dedicated instruction
Buffer memory
Communication using fixed buffer
Communication using random access buffer
Communication using the MC protocol
Communication using data link instructions
Communication via MELSECNET/H, MELSECNET/10
Communication by e-mails
Communication by Web
Ethernet
module
OSI reference model
corresponding to the PLC
configuration
(Layers)
Application layer
Presentation layer
Session layer
Transport layer
Network layer
Data link layer
Physical layer
(100BASE-TX,10BASE-T,10BASE5, 10BASE2)
ARP
ICMP
Etherrnet
FTP
SMTP
POP3
DNS
HTTP
Etherrnet
(100BASE-TX,10BASE-T,10BASE5, 10BASE2)