Mitsubishi MELSEC Q Series Reference Manual page 146

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3 WHEN COMMUNICATING USING THE QnA COMPATIBLE 3E/3C/4C FRAMES OR 4E FRAME
POINT
(1) Designate the number of device points within the following range:
(a) When accessing the Q/LCPU on the station where the C24/E71 is loaded
(local station), or the Q/LCPU on the station connected on a Q/L series
supporting network system (CC-Link IE Controller Network, CC-Link IE
Field Network, MELSECNET/H, MELSECNET/10, or Ethernet) (other
station)
Number of device points
1) Via the E71
2) Via the C24
(b) When accessing the QnACPU (other station), or the QCPU/QnACPU
on the station connected on a QnA series supporting network system
(MELSECNET/10, or Ethernet) (other station)
Number of device points
1) Via the E71
2) Via the C24
(c) When accessing a programmable controller CPU other than the above
(other station)
Number of device points
(2) Set the access range as follows
Access range
(3) When accessing an ACPU via the E71, if an odd number is specified as the
device points, dummy data are added to the response data.
In the case of communication in ASCII code, 1 byte (30
In the case of communication in binary code, 1/2 byte (0
end.
(Example) For the ASCII code communication, reading 3-point data will result
in returning 4-point data. The last 1 byte is dummy data.
: 1  number of device points  3584, 7168
or 7904
: Communication in ASCII
code
Communication in binary
code
: 1  number of device points  1792, 3584
or 3952
: Communication in ASCII
code
Communication in binary
code
: 1  number of device points  256
: (Head device number + number of device points - 1) 
maximum device number
: 3584 points
: 7168 points
: 7904 points
: 1792 points
: 3584 points
: 3952 points
) is added to the end.
H
) is added to the
H
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