Omron CS1W-HCA12-V1, Operation Manual

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61
Overview
Section 4-1
n = CIO 2000 + (unit number
´
10) in the CPU Unit
m = (unit number
´
100) in the CPU Unit
Note Data is exchanged during the I/O refresh period of the CPU Unit.
4-1-2 Data Exchange Using the Words Allocated in CIO Area
Data is exchanged cyclically (i.e., at I/O refresh) between the CPU Unit’s
words allocated in CIO Area (n to n+9) and Customizable Counter Unit’s SR
Area words SR 230 to SR 239. This data exchange consists of two types of
data.
1,2,3... 1. CIO Area words allocated to special functions (n, n+5): These words are
used for commands from the CPU Unit and status notification from the
Customizable Counter Unit.
2. CIO Area words for general-purpose data (n+1 to n+4, n+6 to n+9)
Method Customizable
Counter Unit
words
CPU Unit
words
Special-
ized or
general-
purpose
From CPU
Unit to Cus-
tomizable
Counter Unit
From Custom-
izable Counter
Unit to CPU
Unit
Timing of
transfer
Specification
method
1.
Data
exchanged
using allo-
cated CIO
Area words SR Area
(SR 230 to
SR 239) Allocated
CIO Area
words
(n to n+9) Specialized 1 word (n) 1 word (n+5) At I/O
refresh
(See note.) Fixed
General-
purpose 4 words
(n+1 to n+4) 4 words
(n+6 to n+9)
2.
Data
exchanged
using allo-
cated DM
Area words User-set words
(in the DM, EM,
CIO, LR, or AR
Area) Allocated
DM Area
words
(m to m+99) Special-
ized (Initial
Setting
Area) 10 words
(m to m+9) None At startup
or Unit
restart The user-set
words in the
Customizable
Counter Unit
are specified
in allocated
DM Area
words (m+1 to
m+5).
General-
purpose 90 words total
(m+10 to m+99) At I/O
refresh
(See note.) ---
3.
Data
exchanged
using LR
Area words LR Area User-set
words (in the
CIO, WR,
AR, HR, DM,
or EM
Areas) General-
purpose 32 words total At I/O
refresh
(See note.) The user-set
words in the
CPU Unit are
specified in
the Unit Setup
Area in the
Customizable
Counter Unit.