Mitsubishi Melsec-L Series User Manual page 157

10 - 7
POINT
(1) The position and size of the receive area in the buffer memory can be changed
with the GX Works2 in accordance with the specifications of the external
device and the receive data length. (Refer to Section 7.2)
(a) When changing the position and size of the receive area in the buffer
memory with GX Works2, specify as follows:
1) [Various_Control_Specification] screen
reception area"
Designate the starting address for the area to be used as the receive
area in the user setting area (address: 400
3FFF ).
H
2) [Various_Control_Specification] screen
reception area"
Designate by address the length of the area (0001
used as the receive area in the user setting area (address: 400
1AFF , 2600
H
(b) When changing the position and size of the receive area in the buffer
memory, if any of the functions below are used concurrently, make sure
that the addresses of the receive area do not overlap with the buffer
memory addresses assigned for storing transmission/receive data with the
functions.
1) MC protocol buffer memory read/write function
2) MC protocol on-demand function
3) Predefined protocol function (transmission/reception data storage
area)
4) Nonprocedural protocol transmission/receive function
5) Bidirectional protocol transmission/receive function
6) Communication data monitoring function
(2) Set the size of data per data transmission from the external device to the C24
so that it is equal to or smaller than the size of the receive data storage area in
the buffer memory.
(Receive data storage area) ≥ (Size of data in any data section to be sent from
To transmit data whose size is larger than the receive data storage area,
increase the receive area, or divide the transmission data before sending.
10 DATA COMMUNICATION USING THE NONPROCEDURAL PROTOCOL
"Receive buffer memory head address designation"
"Receive buffer memory length designation"
to 3FFF ).
H H
the external device)
"For designation of
to 1AFF , 2600 to
H H H
"For designation of
to 1A00 ) to be
H H
H
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to