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MELSEC-QnA
15 FUNCTIONS (FUNCTION VERSION B OR LATER)
Buffer memory address
Setting item Description
Hex. Dec.
A
llocation of
communication
buffer and
automatic update
buffer
Specifies the size of the buffer memory that is
allocated during the transient transmission to local,
standby master or intelligent device stations.
Default value
Send buffer : 40
H (64) (word)
Receiving buffer: 40
H (64) (word)
Automatic updating buffer: 80
H (128) (word)
Setting range
•Send/receive buffer
: 0
H (0) (word) (no setting) or 40 H (64)
(word) to 1000
H (4096) (word)
Note that the total size of the send/receive
buffer is within 1000
H (4096) (word).
•Automatic update buffer
: 0
H (0) (word) (no setting) or 80 H (128)
(word) to 1000
H (4096) (word)
Note that the total size of the automatic
update buffers is within 1000
H (4096)
(word).
80
H (send buffer)
81
H (receive buffer)
82
H (automatic
update buffer)
to
CB
H (send buffer)
CC
H (receive buffer)
CD
H (automatic
update buffer)
The first
intelligent
device
The 26th
intelligent
device
128 (send buffer)
129 (receive buffer)
130 (automatic
update buffer)
to
203 (send buffer)
204 (receive buffer)
205 (automatic
update buffer)
The first
intelligent
device
The 26th
intelligent
device
POINT
(1) The scan mode cannot be specified with the TO instruction. Use GX Developer to make
setting.
(2) For the communication buffer size, specify the size of the data to be sent or received plus 7
words.
(3) For the automatic update buffer size, allocate the size necessary for each intelligent device.
15.2.2 Automatic refresh parameters
Automatic refresh parameters are used to refresh all of the devices in the CC-Link to
the CPU device during the END processing. The devices that can be set by the
automatic refresh parameters are shown in Table 15.3.
Table 15.3 Automatic refresh parameters (Device that can be set)
CPU device Bit device Word device
CC-Link device X Y M B T ST C F SB D W T ST C R ZR SW
RX
RY
RWw
RWr
SB
SW
15.3 Automatic Refresh Function
This function refreshes data to be cyclically transmitted data such as RX and RY to a
desired device by the END processing specified in a peripheral device.
This eliminates the process to access the buffer memory using the FROM/TO
instructions.
For details of setting from a peripheral device, refer to the SW
IVD/NX-GPPQ GPP
Function Software Package Operating Manual (Offline) /GX Developer.
POINT
The automatic refresh function is effective only up to eight master module. When using nine or
more master modules, it must be done from the sequence program.