7
COMMUNICATION USING BUILT-IN ETHERNET
PORTS OF CPU MODULE
7.4 MC Protocol Communication
7 - 17
1
Overview
2
Performance
Specification
3
Sequence Program
Configuration and
Execution Conditions
4
I/O Nunber Assignment
5
Memories and Files
Handled by CPU Module
6
Functions
7
Communication using
built-in Ethernet ports of
CPU module
8
Communication with
Intelligent Function
Module
(4) Precautions
(a) Number of connected modules
In the connection with external devices using the MC protocol, the number of CPU
modules set as "MELSOFT connection" in the open settings on Built-in Ethernet
port tab of PLC parameter can be connected simultaneously.
(b) Data communication frame
Table7.5 shows the frames available in the Built-in Ethernet port QCPU.
(c) Access range
• Only connected CPU module can be accessed. Accessing a CPU module not
connected results in an error.
• In a multiple CPU system, other CPU modules not connected to Ethernet
cannot be accessed.
• Accessing a CPU module on another station in CC-Link IE controller network,
MELSECNET/H, Ethernet or CC-Link via a connected CPU module is not
possible.
(d) Precautions when UDP protocol is selected
• If a new request message is sent to the same UDP port while the port waits
for a response message, the new request message is discarded.
• Setting same host station port number to multiple UDP ports is regarded as
one setting. When communicating with multiple external devices using the
same host station port number, select TCP protocol.
Table7.5 Available frames in Built-in Ethernet port QCPU
Communication frame Built-in Ethernet port QCPU
4E frame
QnA-compatible 3E frame
A-compatible 1E frame
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