Mitsubishi MELSEC LJ71C24, User Manual

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15 TROUBLESHOOTING
15.5 Clearing the Programmable Controller CPU Information
This section explains how to clear the programmable controller CPU information.
(1) Programmable controller CPU information
(a) This is the information about the access target CPU module type used in
MC protocol communications.
The C24 obtains this information from the access target CPU module at the
time of initial access, and stores it inside the C24.
(b) The programmable controller CPU information is cleared in the following
cases:
• When the programmable controller is powered OFF and then ON, or
when the CPU module is reset
• When the programmable controller CPU information clear request is
executed
(2) If the programmable controller CPU information has not been
correctly obtained
The following problems may occur:
• Accessible device range is narrowed. (Error code: 7140
H
)
• Some of commands and/or devices cannot be used. (Error code: 7142
H
,
714D
H
), etc.
In the above case, execute the programmable controller CPU information clear
request.
POINT
If initial access is made at startup of the access target CPU module or while the
network is unstable, the programmable controller CPU information may not be
correctly acquired.
(3) Operation of the programmable controller CPU information clear
request
(a) Write "4C43
H
" to the programmable controller CPU information clear
request (address: 80
H
). (Set by the user)
b15 b0
80
H
Write 4C43
H
0000
H
: No request (Set by C24)
4C43
H
: Requested
Buffer memory address
to
(Default: 0000
H
)
(b) The programmable controller CPU information clear processing of the C24
is executed.
1
(c) Upon completion of the clear processing, "0000
H
" is written to the
programmable controller CPU information clear request (address: 80
H
).
(Set by the C24)
0000
H
4C43
H
0000
H
Clear request
Buffer memory address: 80
H
Clear processing
1 The transmission sequence status (address: 255
H
/265
H
) is also initialized.