Holding Area; Cpu Bus Unit Area; Compobus/D Areas - Omron SYSMAC CV Series Operation Manual

CIO (Core I/O) Area

3-3-5 Holding Area

3-3-6 CPU Bus Unit Area

3-3-7 CompoBus/D Areas

either a SYSMAC LINK System or a SYSMAC NET Link System. Link Area
addresses run from CIO 1000 through CIO 1199. Link Area words CIO 1000
through CIO 1063 and DM Area words D00000 through D00127 are auto-
matically used for data link tables unless specific link words are designated.
Allocations can be designated from the CVSS/SSS. Refer to the CVSS/SSS
Operation Manuals , and the SYSMAC LINK System Manual , or SYSMAC
NET Link System Manual for details.
The Holding Area is used to store/manipulate various kinds of data and can
be accessed either by word or by bit. Holding Area bits can be used in any
order required and can be programmed as often as required.
The default Holding Area word addresses range from CIO 1200 through CIO
1499; bit addresses, from CIO 120000 through CIO 149915. The range of the
Holding Area can be changed to any size between CIO 1000 through CIO
2399 with the PC Setup from the CVSS/SSS. If the Holding Area is in-
creased, it will overlap other areas. An "H" will appear before Holding Area bit
addresses on the CVSS/SSS screen. Refer to the CVSS/SSS Operation
Manuals for details.
The Holding Area retains status when the operating mode is changed, power
is interrupted, or PC operation is stopped.
Holding Area bits and words can be used to preserve data whenever PC op-
eration is stopped. Holding bits also have various special applications, such
as creating latching relays with the KEEP instruction and forming self-holding
outputs. These are discussed in Section 4 Writing Programs and Section 5
Instruction Set .
Two types of external bus are provided for CV-series PCs: the high-speed CPU
bus (S Bus) and the I/O bus. Units that connect to the CPU bus on the CPU or
Expansion CPU Rack are called CPU Bus Units and include the SYSMAC NET
Link Unit, SYSMAC LINK Unit, SYSMAC BUS/2 Remote I/O Master Unit, BASIC
Unit, and Personal Computer Unit.
CPU Bus Unit Area addresses range from CIO 1500 through CIO 1899. These
400 words are divided into 16 groups of 25 words each. These are allocated to
CPU Bus Units according their unit number settings as shown in the following
tables.
Unit # 0 1
CIO 1500 1525
words to to
1524 1549
Unit # 8 9
CIO 1700 1725
words to to
1724 1749
An additional1600 words in the DM Area (D02000 to D03599) are provided for
CPU Bus Units. The particular function of words allocated to the Unit depends on
the CPU Bus Unit being used.
I/O bits allocated to CompoBus/D correspond to external I/O points on the de-
vices connected to the CompoBus/D device network. Refer to CompoBus/D
(DeviceNet) Operation Manual (W267) for further information.
2 3 4
1550 1575 1600
to to to
1574 1599 1624
10 11 12
1750 1775 1800
to to to
1774 1799 1824
Section 3-3
5 6 7
1625 1650 1675
to to to
1649 1674 1699
13 14 15
1825 1850 1875
to to to
1849 1874 1899
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