Counter Area; Dm And Em Areas - Omron SYSMAC CV Series Operation Manual

DM and EM Areas

3-10 Counter Area

3-11

DM and EM Areas

68
Counter Completion Flags and present values (PV) are accessed through
counter numbers ranging from C0000 through C0511 for the CV500 or
CVM1-CPU01-EV2 and from C0000 through C1023 for the CV1000,
CV2000, CVM1-CPU11-EV2, or CVM1-CPU21-EV2. Each counter number
and its set value (SV) are defined using counter instructions. No prefix is re-
quired when using a counter number to create a counter in a counter instruc-
tion.
The same counter number can be defined using more than one of these
instructions as long as the instructions are not executed in the same cycle. If
the same counter number is defined in more than one of these instructions or
in the same instruction twice, an error will be generated during the program
check, but as long as the instructions are not executed in the same cycle,
they will operate correctly. There are no restrictions on the order in which
counter numbers can be used.
Once defined, a counter number can be designated as an operand in one or
more of certain instructions other than those listed above. Counter numbers
can be designated for operands that require bit data or for operands that re-
quire word data. When designated as an operand that requires bit data, the
counter number accesses the completion flag of the counter. When desig-
nated as an operand that requires word data, the counter number accesses a
memory location that holds the PV of the counter.
Counter PVs are reset when the CNR(236) instruction is executed, but unlike
timers, counters maintain their status when PC operation is begun, and when
in interlocked program sections when the execution condition for IL(002) is
OFF.
The DM (Data Memory) Area is used for internal data storage and manipula-
tion and is accessible only by word. Addresses range from D00000 through
D08191 for the CV500 or CVM1-CPU01-EV2; from D00000 through D24575
for the CV1000, CV2000, CVM1-CPU11-EV2, or CVM1-CPU21-EV2.
The EM (Extended Data Memory) Area is available with the CV1000,
CV2000, or CVM1-CPU21-EV2 only and only if purchased and installed as
an option. EM Area and DM Area functions are identical. The main difference
between EM and DM is that DM is internal, while EM is contained on an EM
Unit, a card that fits into a slot on the CV1000, CV2000, or
CVM1-CPU21-EV2 CPU. There are three models of Memory Units available,
with 64K words (E00000 to E32765
E32765 4 banks), and 256K words (E00000 to E32765
When the PC is turned on, the EM bank number is automatically set to 0, but can
be changed with the EMBC(171) instruction.
When using the SYSMAC NET Link or SYSMAC LINK systems, D00000
through D00127 are automatically allocated as part of the Data Link Table
unless data link are set manually from the CVSS/SSS. The 1,l600 words
from D02000 to D03599 are allocated for CPU Bus Units, 100 words for each
Unit. The particular function depends on the type of CPU Bus Unit being
used. Refer to the CPU Bus Unit's Operation Manual for details.
Note D02000 to D03599 are not used by SYSMAC BUS/2 Remote I/O Master Units.
Section 3-11
2 banks), 128K words (E00000 to
8 banks).