Chapter 2 Communication Specifications - Mitsubishi MELSEC L Series 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
Maximum distance between hub
Transmission
and node
specifications
Maximum
number of
nodes/
connection
TCP/IP
Number of
connections
UDP/IP
10BASE-T
*1
Connection cable
100BASE-TX
*1 Straight cables can be used.
Crossing cables can also be used for connecting a CPU module and a GOT directly with an Ethernet cable.
*2 Use of STP cables is recommended in an environment with noise.
Hubs with 10BASE-T or 100BASE-TX ports
Up to 16 external devices can access one CPU module at the same time.
*3 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 offerred 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.)
18
COMMUNICATION SPECIFICATIONS
10BASE-T
100BASE-TX
Total of 16 for socket communications, MELSOFT connections, and MC
Ethernet cable of category 3 or higher (STP/UTP cable)
*3
can be used.
Specification
100 or 10 Mbps
Full-duplex or half-duplex
Base band
100 m
Cascade connection: Up to four
Cascade connection: Up to two
protocol.
One for FTP
Ethernet cable of category 5 or higher (STP cable)
*2