I/O Area - Omron SYSMAC CV Series Operation Manual

CIO (Core I/O) Area
Area PC
Work All
Areas
SYSMAC CV500
BUS Area CVM1-CPU01-EV2
CV1000/CV2000
CVM1-CPU11-EV2
CVM1-CPU21-EV2

3-3-1 I/O Area

I/O Words
Input Bit Usage
Output Bit Usage
Range
Words: CIO 1964 to CIO 1999
Bits: CIO 196400 to CIO 199915
($07AC to $07CF)
Words: CIO 2064 to CIO 2299
Bits: CIO 206400 to CIO 229915
($0810 to $08FB)
Words: CIO 2300 to CIO 2427
Bits: CIO 230000 to CIO 242715
($08FC to $097B)
Words: CIO 2300 to CIO 2555
Bits: CIO 230000 to CIO 255515
($08FC to $09FB)
The I/O Area is used as data to control I/O points.Those words that are used to
control I/O points are called I/O words. Bits in I/O words are called I/O bits. I/O
Area bits that are not allocated as I/O bits are reset when power is interrupted or
PC operation is stopped. The number of I/O words varies between the PCs as
shown in the following table.
PC
CV500/
CVM1-CPU01-EV2
CV1000/
CVM1-CPU11-EV2
CV2000
CVM1-CPU21-EV2
The maximum number of I/O bits is 16 (bits/word) times the number of I/O
words, i.e., 512 bits for the CV500 or CVM1-CPU01-EV2; 1,024 for the
CV1000 or CVM1-CPU11-EV2; and 2,048 for the CV2000 or
CVM1-CPU21-EV2. I/O bits are assigned to input or output points on Units
connected at various locations in the PC System, as described later in this
section (see Word Allocations ).
If an I/O point on a Unit brings an input into the PC, the bit assigned to it is an
input bit; if the point sends an output from the PC, the bit assigned to it is an
output bit. To turn ON an output, the output bit assigned to it must be turned
ON from the program or from a Peripheral Device. When an input turns ON,
the input bit assigned to it also turns ON and the status of the input can be
accessed indirectly by reading the status of the input bit assigned to it. Input
status and control output status is thus manipulated through I/O bits.
After the I/O Table has been registered (see Word Allocations , below), an "I" will
appear before input bit addresses and a "Q" will appear before output bit ad-
dresses on CVSS/SSS (CV Support Software/SYSMAC Support Software) dis-
plays.
I/O bits that are not assigned to I/O points can be used as work bits.
Input bits record external signals input to the PC and can be used in any or-
der in programming. Each input bit can also be used in as many instructions
as required to achieve effective and proper control. They cannot be used as
operands in instructions that control bit status, e.g., the OUTPUT, DIFFER-
ENTIATE UP, and KEEP instructions. In other words, input bits should be
treated as read-only bits.
Output bits are used to output program execution results and can be used in
any order in programming. Generally speaking, any one output bit should be
These bits are used in the program to
manipulate or to temporarily store data.
These bits can be set as holding bits via the
PC Setup.
These bits are used for remote I/O points in
the SYSMAC BUS Remote I/O System
unless the default allocations are changed in
the PC Setup.
Bits not used to control I/O points can be
used as work bits. Up to word 2399 can be
set as holding bits via the PC Setup.
I/O words
CIO 0000 to CIO 0031
CIO 0000 to CIO 0063
CIO 0000 to CIO 0127
Section 3-3
Function
I/O bits
CIO 000000 to CIO 003115
CIO 000000 to CIO 006315
CIO 000000 to CIO 012715
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