Chapter 12 Functions Accessed Via Ethernet Ports; User Ethernet Port (Q24Dhccpu-V/-Vg/-Ls And Q26Dhccpu-Ls); Built-In Ethernet Port (Q12Dccpu-V) Function - Mitsubishi Electric MELSEC Q Series User Manual

CHAPTER 12
This chapter describes the communication with peripherals, Telnet function and FTP client function.
When using Q12DCCPU-V, consider the terms as shown in the following table.
12.1
User Ethernet Port (Q24DHCCPU-V/-VG/-LS and
Q26DHCCPU-LS) / Built-in Ethernet Port (Q12DCCPU-V)
Function
User Ethernet port (CH1 and CH2) can establish communication with the following peripherals.
• CW Workbench
• Personal computer for maintenance (such as Telnet and FTP)
● Following peripherals cannot establish communication with the user Ethernet port (CH1 and CH2).
Connect to the system Ethernet port (S CH1).
• Setting/monitoring tools for the C Controller module
• GOT
● Compatible with jumbo frame for the series Q24DHCCPU-V/-VG that comes first five digits "17092" or higher of serial No.
MTU value (Maximum Transmission Unit) used in the IP communication can be changed by using the following
operations. (The default value of MTU is 1500 bytes.)
ifconfig("Interface name mtu MTU value")
Specify "gei0" and "gei1" for interface name: CH1 and CH2 respectively.
Specify MTU value within the range of 1 to 9000 bytes.
[Example] When changing MTU of CH1 to 9000 bytes.
ifconfig("gei0 mtu 9000")
To check the set value, execute ifconfig with no argument.
Ethernet frame exceeding the set MTU will be divided and sent. However, there is an upper limit to the packet size of TCP
or UDP using socket communication once. When setting the MTU that exceeds the set upper limit, an error occurs while
sending a request.
If an error occurs, change the MTU value or the upper limit of the packet size. (The default upper limit of the packet size
is IPNET_SOCK_DEFAULT_SEND_BUFSIZE of kernel configuration and is set to 10000 bytes.)
The upper limit of the packet size can be changed by specifying the option name "SO_SNDBUF" in the setsockopt() from
the Socket API of VxWorks component. For details, refer to VxWorks manual.
192
FUNCTIONS ACCESSED VIA
ETHERNET PORTS
Before
Q24DHCCPU-V/-VG/-LS
Q26DHCCPU-LS
User Ethernet port (CH1 and CH2)
System Ethernet port (S CH1)
After
Q12DCCPU-V
Built-in Ethernet port (CH1 and CH2)
Q24DHC-V Q24DHC-VG Q24DHC-LS Q26DHC-LS Q12DC-V
For "-LS", consult with the
partner (operating system vendor).