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APPENDICES
MELSEC-A
APPENDICES
APPENDIX
1
PRECAUTIONS CONCERNING COMPATIBILITY AND THE USE OF
EXISTING PROGRAMS PREPARED FOR THE AJ71C2466 COMPUTER
LINK MODULE
The following sections describe precautions which should be taken when
using the AlSJ71C24-R2 computer link module or the AlSJ71C24-PRF
computer linklprinter function module (hereafter called the AlSJ71C24).
These precautions cover compatibility with the AJ71C24-S6 computer link
module (hereafter called the AJ71C24-S6), the use of existing programs
prepared for the AJ71CZ4-S6, and procedures for changing, adding, and
installing modules to the existing network.
1.1
Compatibility
The AlSJ71 C24 and the AJ71 C24-S6 use the same basic programs (PC CPU
programs and computer programs).
However, m:n data communications cannot be done using an RS-422.
(The A1SJ71 C24 has no RS-422.)
1.2
Precautions When Using Existing Programs
The following describes the precautions to take when the AlSJ71C24 is
replaced by the AJ71 C24-S6.
(1) The time required for communications with a PC CPU differs between
the AlSJ71 C24 and the AJ71C2446. The User's Manual for each type
of module gives details.
(2)
Since the AlSJ71C24 has no RS-422, m:n data communications cannot
be done using an RS-422.
1.3
Function Comparison
The following table gives the function comparison between the AlSJ71C24
and the AJ71C24-S6:
Mode switching
2
-
AJ71 C24-S6
I
When the PC CPU is on line. the dedicated ~rotocol format
I
-
I
AlSJ71C24
See Section
is selected lrorn 1 l o 4 and the mode is switched belween
the no.protoco1 and the bid~rectional modes.
APP
-
1
Ci
7,6
DC code control
I
I
Controls the transmissionlreceive using the DCl to DC4.
7.7
APP
6
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