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10-12
(b) Program example when the D(P).DDWR instructions are executed concurrently
The following shows a program example that writes ZR0 to ZR999 (1000 points) in CPU
No.1 to ZR0 to ZR999 in CPU No.2 with the D.DDWR instruction.
As shown on the program example, multiple CPU device write/read instructions can be
executed concurrently.
When reading/writing devices with the multiple CPU high-speed transmission dedicated
instructions concurrently, the more the total number of blocks in the multiple CPU high
speed transmission area (send area), the more the time taken to complete reading/
writing with the multiple CPU high-speed transmission dedicated instruction can be
shortened.
Program example when the D(P).DDWR instructions are executed concurrently
When the DDWR instruction is completed abnomally, the annunciator is turned on and data writing is stopped
158
M3 M4
Completion
device 1
Error
completion
device 1
SET F0
RST M0
During
writing
DDWR instruction
error display
M5 M6
Completion
device 2
Error
completion
device 2
Next data writing is requested at nomal completion of the second DDWR instruction
197
M5 M6
Completion
device 2
Error
completion
device 2
+ K200 Z2
< Z2 K1000
= Z2 K1000
PLS M7
Execution request of the
next DDWR instruction
RST M0
During writing
END
241
The maximum number of used blocks for multiple CPU high-speed
transmission dedicated instruction setting is set to CPU No.2
SM402
Turn-on for one
scan after RUN
MOV K7 SD797
Maximum number of
used blocks
(CPU No.2)
MOV K100 D1
Number of
write points 1
MOV K100 D3
Number of
write points 2
Data writing is started at the rise of the write command (X0)
X0 M0
Write
comma
During
writing
39
RST Z2
SET M0
During writing
First DDWR instruction, Second DDWR instruction
70
M0
During
writing
SET M1
During execution of
the DDWR instruction 1
SET M2
During execution of
the DDWR instruction 2
M7
Execution request of the next
DDWR instruction
The first DDWR instruction is executed
94
M1
During execution
of the DDWR
instruction 1
SM797
Number of used
blocks information
(CPU No.2)
D.DDWR H3E1 D0 ZR0Z2 ZR0Z2 M3
Completion
status 1
Write
destination
source write Completion
device 1
RST M1
During execution of the
DDWR instruction 1
The second DDWR instruction is executed
126
M2
During execution
of the DDWR
instruction 2
SM797
Number of used 3
blocks information
(CPU No.2)
D.DDWR H3E1 D2 ZR100Z2 ZR100Z2 M5
Completion
status 2
Write
destination
source write Completion
device 2
RST M2
During execution of the
DDWR instruction 2
0