Chapter 2 Communication Specifications - Mitsubishi L02CPU User Manual

CHAPTER 2
The following are the communication specifications of the built-in Ethernet port of the CPU module.
Item
Data transfer speed
Communication mode
Transmission method
Transmission
Maximum distance between hub and
specifications
node
Maximum
number of
nodes/connection
TCP/IP
Number of
connections
UDP/IP
Connection 10BASE-T
*1
cable
100BASE-TX
*1 Straight cables can be used. When the CPU module is directly connected to GOT with the Ethernet cable, a cross cable
of Category 5e or lower can also be used.
*2 This number applies when a repeater hub is used. When using a switching hub, check the number of cascaded stages
with the manufacturer of the hub to be used.
*3 Use of STP cables is recommended in an environment with noise.
*4 One setting of FTP client or e-mail uses two consecutive connections.
Hubs with 10BASE-T or 100BASE-TX ports
Up to 16 external devices can access one CPU module at the same time.
*5 The ports must comply with the IEEE802.3 10BASE-T or IEEE802.3 100BASE-TX standards.
● When connected to a hub, the CPU module determines the cable used (10BASE-T or 100BASE-TX) and the
communication mode (full-duplex or half-duplex) according to the hub. Set the hub into the half-duplex mode if the hub
that does not have the auto-negotiation function.
● The operation of commercial devices used for the following applications is not guaranteed. Check the operation before
using the module.
• Internet (general public line) (Internet-access service offered by an Internet service provider or a
telecommunications carrier)
• Firewall device(s)
• Broadband router(s)
• Wireless LAN
● If Ethernet communication is performed with "Specify service process execution counts" selected for "Service processing
setting" in the PLC system tab of PLC parameter, a scan time increases by time for service processing. (approximately
500ms)
To reduce it to 500ms or less, select an item other than "Specify service process execution counts".
(Example: Select "Specify service process time" and then enter a time value.)
● If broadcast storm occurs in the network, scan time may be increased.
● If the destination device of the CPU module does not respond due to power-off or other reasons, Ethernet communication
of the CPU module may delay up to 500ms.
20
COMMUNICATION SPECIFICATIONS
10BASE-T
100BASE-TX
A total of 16 connections of socket communications, MELSOFT connection,
*5
can be used.
Specifications
100/10Mbps
Full-duplex or half-duplex
Base band
100m
Cascade connection: Up to four
Cascade connection: Up to two
MC protocol, predefined protocol, FTP client, and e-mail
1 connection for FTP server
Ethernet cable of category 3 or higher (STP/UTP cable)
Ethernet cable of category 5 or higher (STP cable)
*2
*2
*4
*3