Mitsubishi Electric MELSEC Q Series User Manual page 189

2) Using multiple CPU high speed transmission area
In the direct access mode, the data is transferred in order starting from the one which was written to the user
setting area first.
Using the device which is written after the data transfer regardless of kinds of device or addresses can realize
the data consistency of the transferred data.
Example for program executing interlock in CPUs No.1 and No.2 is shown in Figure 4.44.
Transmission side program (CPU No.1)
Write
command
U3E0\
M0 G10010.0
U3E0\ U3E1\
G10010.0 G10000.0
(1) CPU No.1 writes the send data to the user setting area.
(2) CPU No.1 writes that the data setting complete bit turns on to the user setting area.
< Data in multiple CPU high speed transmission area of CPU No.1 are sent to CPU No.2. >
(3) CPU No.2 detects the send data setting completion.
(4) CPU No.2 processes the receive data.
(5) CPU No.2 writes that the receive data processing completion turns on to the user setting area.
< Data in multiple CPU high speed transmission area of CPU No.2 are sent to CPU No.1. >
(6) CPU No.1 detects that the receive data processing completion turns on, and turns off the data setting
complete bit.
< Data in multiple CPU high speed transmission area of CPU No.1 are sent to CPU No.2. >
(7) CPU No.1 detects that the send data setting completion turns off, and turns off the receive data processing
completion.
Remark
With an instruction such as the BMOV instruction, which writes 2 word or more data to the user setting area, data are
written from the last address to the start address.
When writing the send data and interlock signal together with one instruction, creating an interlock signal at the start of
data will avoid data separation.
4 - 43
U3E1\
G10000.0
1)
Set the send data to the
user setting area
(U3E0\G10000
to G100009).
2)
U3E0\
SET G10010.0
6)
U3E0\
RST G10010.0
RST
Figure 4.44 Interlock program example
Reception side program (CPU No.2)
3)
U3E0\ U3E1\
G10010.0 G10000.0
7)
U3E0\ U3E1\
G10010.0 G10000.0
M0
4)
Operation using the
receive side data
5)
U3E1\
SET G10000.0
U3E1\
RST G10000.0