Send Range Settings - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

7 APPLICATION FUNCTIONS

7.3.1 Send range settings

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Each station's send range of link devices (low-speed LB, low-speed LW) is assigned to
the extended area (2000 to 3FFF) in 16-point units for LB (start :
F) and in one-point units for LW.
Each station's send range can also be assigned using a random station number
assignment sequence.
The B/W device numbers on the CPU side that correspond to the extended area are
not assigned.
(1) Device range
CPU B
MELSECNET/H LB
(2) Screen settings
On the following screen that is displayed by clicking the
Network range assignment button, 768 points are assigned to the send range
for each station (low-speed LB, low-speed LW).
POINT
(1) To use 2-word (32-bit) data, set appropriate send points and send range that
satisfy the conditions for the 32-bit data assurance.
For details, refer to Section 6.2.1.
(2) The device points (B, W) of the CPU module can be increased by changing
the PLC parameters (8 k to 16 k). However, there are restrictions for the
device points, such as that the total must be less than 28.8 k words.
(3) Link devices in the Extended function area (2000
for normal cyclic transmission (when link devices of 8193 points or more are
used for normal cyclic transmission).
For low-speed transmission, use link devices in the Extended function area,
which are not used for normal cyclic transmission.
(4) The total of the send ranges per station must not exceed 2000 bytes in the
low-speed cyclic transmission. (The send range for the normal cyclic
transmission is not included.)
(5) LX and LY cannot be set as link devices for low-speed cyclic transmissions.
0
H
Normal cyclic transmission area
(LB/16-point, LW/1-point units)
MELSEC-Q
2000
H
(8192)
Extended function area
Send range
(2000 to 3FFF)
Send points
to 3FFF ) can be also used
H H
0 to end
3FFF
H
(16383)
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