Accessible Range Of Each Data Communication Frames - Mitsubishi MELSEC Q Series Reference Manual

2.2 Accessible Range of Each Data Communication Frames

2 - 3
2 DATA COMMUNICATION USING THE MELSEC COMMUNICATION PROTOCOL
(2) When accessing via the C24
The external device accesses the programmable controller CPU using frames
with a format number selected in the "Communication protocol setting" in the
switch settings using the programming tool.
When any of Formats 1 to 4 is selected, access is enabled using each of the
four types of frames shown above and data communication is performed by
the transmission/reception of command messages and response messages
in the selected format.
(3) When accessing via the E71
The external device can access using any of the two types of frames shown
above; it accesses the programmable controller CPU by sending/receiving
command messages and response messages using frames corresponding to
the setting selected in the operation settings using the programming tool.
(4) Time required for communication in binary code is shortened because the
amount of the communication data is approximately a half of what is required
for communication in ASCII code data.
In a communication using the MC protocol, access to programmable controller stations
on which the C24/E71 is not loaded is possible via CC-Link IE Controller Network,
CC-Link IE Field Network, MELSECNET/H, MELSECNET/10 and Ethernet.
This section explains the range of programmable controllers of other stations that can
be accessed from an external communication device when the access destination
programmable controller is not directly connected by a serial communication line or
Ethernet.
Target module
QnA compatible 3C frame
QnA compatible 4C frame
C24
QnA compatible 2C frame
A compatible 1C frame
4E frame
E71
QnA compatible 3E frame
A compatible 1E frame
Frame used
Formats 1 to 4
Formats 1 to 4
Format 5
Formats 1 to 4
: Accessible, : Not accessible
Range of accessible stations
1) 2) 3)
2 - 3
4)