Cio Area - Omron SYSMAC CS Series Operation Manual

CIO Area

Restrictions
9-4

CIO Area

I/O Area Initialization
1,2,3...
IOM Hold Bit Operation
There are special restrictions in programming, allocations, and data communi-
cations with the CPU Unit for the following C200H Special I/O Units. Refer to
Appendix F Restrictions in Using C200H Special I/O Units for details.
Unit
ASCII Units
High-speed Counter Units
ID Sensor Units
Position Control Units
Fuzzy Logic Units
High-speed Counter Units
Motion Control Units
C200H I/O LInk Units
There are no special restrictions for other C200H Special I/O Units.
I/O Area addresses range from CIO 0000 to CIO 0319 (CIO bits 000000 to
031915), but the area can be expanded to CIO 0000 to CIO 0999 by changing
the first Rack word with any Programming Device other than a Programming
Console. The maximum number of bits that can be allocated for external I/O
will still be 5,120 (320 words) even if the I/O Area is expanded.
Note The maximum number of external I/O points depends upon the CPU Unit
being used.
Words in the I/O Area can be allocated to I/O terminals on Basic I/O Units
(CS-series Basic I/O Units, C200H Basic I/O Units, and C200H Group-2 High-
density I/O Units).
Words are allocated to Basic I/O Units based on the slot position (left to right)
and number of words required. The words are allocated consecutively and
empty slots are skipped. Words in the I/O Area that aren't allocated to Basic
I/O Units can be used only in the program.
CIO 0000 to CIO 0319 include the C200H DeviceNet Output Area (CIO 0050
to CIO 0099) and the PLC Link Words CIO 0247 to CIO 0250. Be sure that
word allocations do not overlap allocations for other I/O points when using a
C200H DeviceNet Master Unit (C200HS-DRM1-V1) or when using a PLC Link
Unit.
The contents of the I/O Area will be cleared in the following cases:
1. The operating mode is changed from PROGRAM to RUN or MONITOR
mode or vice-versa and the IOM Hold Bit is OFF.
(See the following explanation of IOM Hold Bit Operation.)
2. The PLC's power supply is cycled and the IOM Hold Bit is OFF or not pro-
tected in the PLC Setup.
(See the following explanation of IOM Hold Bit Operation.)
3. The I/O Area is cleared from a Programming Device.
4. PLC operation is stopped when a fatal error other than an FALS(007) error
occurs. (The contents of the I/O Area will be retained if FALS(007) is exe-
cuted.)
If the IOM Hold Bit (A50012) is ON, the contents of the I/O Area won't be
cleared when a fatal error occurs or the operating mode is changed from
PROGRAM mode to RUN or MONITOR mode or vice-versa.
Model number
C200H-ASC02/ASC11/ASC21/ASC31
C200H-CT001-V1/CT002
C200H-IDS01-V1/IDS21
C200H-NC111/NC112/NC211
C200H-FZ001
C200H-CT021
C200H-MC221
C200H-DRT21
Section 9-4
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