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APPENDICES
MELSEC-A
APPENDICES
B
APPENDIX 1. Precautions Concerning Compatibility and the Use of Existing
Programs Prepared for the AJ71C24 Computer Link Module
The following sections describe precautions which should be taken when
using the AJ71C2446 computer link module (hereafter called the AJ71C24-
S6). These precautions cover compatibility with the AJ71C24 computer link
module (hereafter called the AJ71 C24), the use of existing programs prepared
for the AJ71C24, and procedures for changing, adding, and installing modules
to the existing network.
1.1
Compatibility
The AJ71C2446 and the AJ71C24 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 AJ71 C24
1.2
Precautions When Using Existing Programs
(1)
Buffer memory readlwrite operations (CR and CW commands)
Addresses lOOH to 11FH in the buffer memory of the AJ71C24-S6 are
allocated for special applications.
Therefore, to read buffer memory orwrite data to the buffer memory using
the CR or CW commands, use the memory areas in addresses 120H and
above.
(2)
Inputloutput for PC CPU
The READY signal Xn7 is provided for the AJ71C24-S6.
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 AJ71C24.
(3)
Communications time
The time required for communications with a PC CPU differs between the
AJ71C24 and the AJ71C24-S6. The User's Manual for each type of
module gives details.
APP
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1
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