How To Clear Programmable Controller Cpu Information - Mitsubishi Electric MELSEC iQ-R Series User Manual

27.2
How to Clear Programmable Controller CPU
Information
This section explains how to clear the programmable controller CPU information.
Programmable controller CPU information
• This is the information about the access target CPU module type used for communications using MC protocol.
C24 obtains this information from the access target CPU module at the time of initial access, and stores it inside the C24.
When accessing for the second time or later, the processing to access to the CPU module get faster in accordance with this
information.
• The programmable controller CPU information is cleared in the following cases:
When the programmable controller is powered OFF  ON, or when the CPU module is reset
When the programmable controller CPU information clear request is executed
If the programmable controller CPU information has not been correctly obtained
The following problems may occur:
• Accessible device range become narrowed. (Error code: 7140H)
• Some of commands and/or devices cannot be used. (Error code: 7142H, 714DH),
etc.
In the above case, execute the programmable controller CPU information clear request.
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.
Operation of the programmable controller CPU information clear request
• Write "4C43H" to the 'Programmable controller CPU information clear request' (Un\G128). (Set by the user)
Buffer memory address
Un\G128
• The programmable controller CPU information clear processing of C24 is performed.
• Upon completion of the clear processing, "0000H" is written to the 'Programmable controller CPU information clear request'
(Un\G128). (Set by the C24)
Clear request
Buffer memory address
Un\G128
*1 The 'Transmission sequence status' (Un\G597/613) is also initialized.
b15
to
Write 4C43H
0000 4C43
H H
Clear processing
b0
(Default: 0000H)
0000H: No request (Set by C24)
4C43H: Requested
0000
H

27.2 How to Clear Programmable Controller CPU Information

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