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CHAPTER 6 COMMUNICATIONS AMONG CPU MODULES
6
6.1 Communications Using the CPU Shared Memory
6.1.1 Communications by auto refresh (using the auto refresh area)
Ex.
Operations when executing auto refresh of four ranges (Setting 1: link relay (B), Setting 2: link register
(W), Setting 3: data register (D), Setting 4: internal relay (M))
Setting 1
B0
to
Setting 2Setting 2Setting 2
W0
Setting 3Setting 3Setting 3
D0
Setting 4
M0
Device
CPU No.2
CPU No.3
CPU No.4
CPU shared memory
CPU No.1
Data are written during END
processing.
Data are written during END processing.Data are written during END processing.
Data are written during END processing.
Data are written during END processing.
Data are written during END processing.
CPU shared memory
of other CPU modules
Data are read during
the END processing of
CPU No.1.
Maximum
2K words
Maximum
2K words
Maximum
2K words
CPU No.2
send data
(No.1)
CPU No.2
send data
(No.2)
CPU No.2
send data
(No.3)
CPU No.2
send data
(No.4)
CPU No.3
send data
(No.1)
CPU No.3
send data
(No.2)
CPU No.3
send data
(No.3)
CPU No.3
send data
(No.4)
CPU No.4
send data
(No.1)
CPU No.4
send data
(No.2)
CPU No.4
send data
(No.3)
CPU No.4
send data
(No.4)
CPU No.1
send data
(No.1)
CPU No.2
receive data
(No.1)
CPU No.3
receive data
(No.1)
CPU No.4
receive data
(No.1)
CPU No.1
send data
(No.2)
CPU No.2
receive data
(No.2)
CPU No.3
receive data
(No.2)
CPU No.4
receive data
(No.2)
CPU No.1
send data
(No.3)
CPU No.2
receive data
(No.3)
CPU No.3
receive data
(No.3)
CPU No.4
receive data
(No.3)
CPU No.1
send data
(No.4)
CPU No.2
receive data
(No.4)
CPU No.3
receive data
(No.4)
CPU No.4
receive data
(No.4)
Maximum
8K words
Maximum
2K words
CPU No.1
send data
(No.1)
CPU No.1
send data
(No.2)
CPU No.1
send data
(No.3)
CPU No.1
send data
(No.4)
User setting area