APPENDICES
MELSEC-A
APPENDICES
APPENDIX
1.
Precautions
Concerning Compatibility and the
Use
of
Existing
Programs Prepared for
the
A171
C24
Computer
Link
Module
The following sections describe precautions which should be taken when
using the AJ71 C24-S8 computer link module (hereafter called the AJ7lC24-
S8). These precautions cover compatibility with the AJ71C24 computer link
module (hereafter called the AJ71C24), the use of existing programs
prepared for the AJ71 C24, and procedures for changing, adding, and install-
ing modules to the existing network.
--
..._.
I
1.1
Compatibility
The AJ71 C24-S8 and the AJ71 C24 have the same dimensions and can be
installed
in
the same way. They also use the same basic programs (PC CPU
programs and computer programs).
Compatibility is maintained
within
the functions supported by the AJ71C24.
1.2
Precrutlons When Uslng Existing
Programs
L.
(1) Buffer memory read/write operations (CR and CW commands)
Addresses 1
OOH
to
11
FH
in
the buffer memory of the AJ71 C24-SB are
allocated for special applications.
Therefore, to read buffer memory or write data to the buffer memory
using the CR or CW commands, use the memory areas
in
addresses
120H and above.
(2) Input/output for PC CPU
L
The READY signal Xn7 is provided for the AJ71 C24-S8.
For the link operating in the no-protocol mode, this READY signal
should be inserted (as the interlock signal) in the sequence program
which uses the AJ71 C24.
(3)
Communications time
The time required for communications with a PC CPU differs between
the AJ71 C24 and the AJ71 C24-S8. The User's Manual for each type of
module gives details.
L
APP-1
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