Auxiliary Area - Omron SYSMAC CS Series Operation Manual

Auxiliary Area

Precautions

9-16 Auxiliary Area

Forcing Bit Status
3. The Function Block Holding Area words are allocated from H512 to H1535.
These words can be used only for the function block instance area (inter-
nally allocated variable area). These words cannot be specified as instruc-
tion operands in the user program.
When a Holding Area bit is used in a KEEP(011) instruction, never use a nor-
mally closed condition for the reset input if the input device uses an AC power
supply. When the power supply goes OFF or is temporarily interrupted, the
input will go OFF before the PLC's internal power supply and the Holding Area
bit will be reset.
Instead, use a configuration like the one shown below.
There are no restrictions in the order of using bit address or in the number of
N.C. or N.O. conditions that can be programmed.
Note When designating addresses in programming or allocations inside C200H
Special I/O Units, "HR 00" to "HR 99" will actually specify H000 to H099 in the
CPU Unit and "AR 00" to "AR 27" will actually specify H100 to H127 in the
CPU Unit. Other addresses in this area cannot be specified inside the C200H
Special I/O Units.
The Auxiliary Area contains 960 words with addresses ranging from A000 to
A959). These words are preassigned as flags and control bits to monitor and
control operation.
A000 through A447 are read-only, but A448 through A959 can be read or writ-
ten from the program or a Programming Device.
Note 1. The addresses in the Auxiliary Area cannot be designated directly in pro-
gramming or allocations inside C200H Special I/O Units.
2. The undefined addresses of the Auxiliary Area may be allocated to func-
tions in future version upgrades of the CPU Unit. Do not use these words
as CIO Area words in the user program.
Bits in the Auxiliary Area cannot be force-set and force-reset continuously.
Input
Unit
Input
Unit
Section 9-16
Set input
Reset input
Set input
Reset input
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