Mitsubishi Q00JCPU User Manual page 531

7
COMMUNICATION
PORTS OF CPU MODULE
(4) Precautions
(a) Number of connected modules
(b) Data communication frame
4E frame
QnA-compatible 3E frame
A-compatible 1E frame
(c) Access range
(d) Precautions when UDP protocol is selected
USING
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.
Table7.5 shows the frames available in the Built-in Ethernet port QCPU.
Table7.5 Available frames in Built-in Ethernet port QCPU
Communication frame
• 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.
• 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.
BUILT-IN ETHERNET
Built-in Ethernet port QCPU
7.4 MC Protocol Communication
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