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Basic I/O Unit Instructions Section 3-23
Restrictions The following restrictions apply to reading from a CPU Bus Unit.
■ Restrictions on the CPU Unit
CS1-H CPU Units
Writing to a CPU Bus Unit is possible only for the following models of CPU
Unit and only for CPU Units manufactured on or after 18 April 2003 (lot num-
ber 030418 or later).
•CS1G-CPU@@H
• CS1H-CPU@@H
The manufacturing date can be confirmed using the lot number given on the
side or bottom of the CPU Unit. Lot numbers indicate the manufacturing date
as follows:
YYMMDD nnnn
YY = Rightmost two digits of the year, MM = Month as a numeric value,
DD = Day of month, nnnn = Serial number
CJ1-H, CJ1M, and CS1D CPU Units
Writing to a CPU Bus Unit is possible only for CPU Unit Ver. 2.0 or later.
Note If IOWR(223) is executed for a CPU Bus Unit running under a CPU Unit that
does not support using IOWR(223) for CPU Bus Units, an error will occur and
the ER Flag will turn ON.
■ Restrictions on the CX-Programmer
Unit numbers for CPU Bus Units can be specified for S with CX-Programmer
version 3.0 or higher.
D
D+1
Desig-
nated
number of
words
written.
Unit number of Special I/O Unit or CPU Bus Unit
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