Online Module Change - Mitsubishi Q Series User Manual

Loop control module
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7 ONLINE MODULE CHANGE

7 ONLINE MODULE CHANGE
When changing a module online, carefully read the QCPU User's Manual (Hardware
Design, Maintenance and Inspection), section 12.4.1 "Online module change".
This chapter describes the specifications of an online module change.
(1)
(2) When you want to continue the pre-change operation with the new module after
(1) Perform an online module change after making sure that the system outside the
(2) To prevent an electric shock and malfunction of operating modules, provide
(3) After the module becomes faulty, the data may not be saved properly.
(4) It is recommended to perform an online module change in the actual system in
(5) Do not install/remove the module to/from the base unit, or the terminal block
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Perform an online module change by operating GX Developer.
an online module change, save/restore the buffer memory contents.
POINT
programmable controller will not malfunction.
means such as switches for powering off each of the external power supply and
external devices connected to the module to be replaced online.
Therefore, prerecord the data to be saved (the whole buffer memory contents
that can be written, see Section 3.5.1).
advance to ensure that it would not affect the other modules by checking the
following:
• Means of cutting off the connection to external devices and its configuration
are correct.
• Switching ON/OFF does not bring any undesirable effect.
to/from the module more than 50 times after the first use of the product. (IEC
61131-2 compliant)
Failure to do so may cause malfunction.
MELSEC-Q
7
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