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Appendix D
Data Areas
The data areas in the CV-series PCs are summarized below. These are the same for all PCs unless specified.
Only dedicated bits are shown specifically. The use of all other bits is determined either by the System the PC
is involved in, e.g., SYSMAC LINK Systems use the Link Area, or by the programmer, e.g., storage of data in
the Dm Area.
Area PC Range Function
CIO Area
(Core I/O)
CV500/
CVM1-CPU01-EV2
Words: CIO 0000 to CIO 2427
Bits: CIO 000000 to CIO 242715
($0000 to $097B)
The CIO (Core I/O) Area is divided into
eight sections, five controlling I/O and three
used to store and manipulate data
internally.
CV1000/CV2000/
CVM1-CPU11-EV2
CVM1-CPU21-EV2
Words: CIO 0000 to CIO 2555
Bits: CIO 000000 to CIO 255515
($0000 to $09FB)
Refer to
3-3 CIO (Core I/O) Area
for details.
Temporary
Relay Area
All TR0 to TR7 (bits only)
($09FF)
Used to temporarily store execution
conditions. TR bits are not input when
programming directly in ladder diagrams,
and are used only when programming in
mnemonic form.
CPU Bus
Link Area
All Words: G000 to G255
Bits: G00000 to G25515
($0A00 to $0AFF)
G000 is the PC Status Area; G001 to G004,
the Clock Area. G008 to G127 contain PC
output bits; G128 to G255, CPU Bus Unit
output bits.
Auxiliary
Area
All Words: A000 to A511
Bits: A00000 to A51115
($0B00 to $0CFF)
Contains flags and bits with special
functions.
Transition
Area
CV500 TN0000 to TN0511
($0D00 to $0D1F)
Transition Flags for the transitions in the
SFC program.
CV1000/CV2000 TN0000 to TN1023 ($0D00 to $0D3F)
Step Area CV500 ST0000 to ST0511 ($0E00 to $0E1F) Step Flags for steps in the SFC program. A
step is active when its flag is ON.
Timer Area CV500/
CVM1-CPU01-EV2
T0000 to T0511
(Completion Flags: $0F00 to $0F1F
Present Values: $1000 to $11FF)
Used to define timers (normal, high-speed,
and totalizing) and to access Completion
Flags, PV, and SV.
CV1000/CV2000/
CVM1-CPU11-EV2
CVM1-CPU21-EV2
T0000 to T1023
(Completion Flags: $0F00 to $0F3F
Present Values: $1000 to $13FF)
Counter
Area
CV500/
CVM1-CPU01-EV2
C0000 to C0511
(Completion Flags: $0F80 to $0F9F
Present Values: $1800 to $19FF)
Used to define counters (normal, reversible,
and transition) and to access Completion
Flags, PV, and SV.
CV1000/CV2000/
CVM1-CPU11-EV2
CVM1-CPU21-EV2
C0000 to C1023
(Completion Flags: $0F80 to $0FBF
Present Values: $1800 to $1BFF)
DM Area CV500/
CVM1-CPU01-EV2
D00000 to D08191 ($2000 to $3FFF) Used for internal data storage and
manipulation.
CV1000/CV2000/
CVM1-CPU11-EV2
CVM1-CPU21-EV2
D00000 to D24575 ($2000 to $7FFF)
EM Area CV1000/CV2000
CVM1-CPU21-EV2
E00000 to E32765 for each bank; 2,
4, or 8 banks ($8000 to $8FFD)
EM functions just like DM. An Extended
Data Memory Unit must be installed.
Index
registers
All IR0 to IR2 Used for indirect addressing.
Data
registers
All DR0 to DR2 Generally used for indirect addressing.
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