Online Module Change - Mitsubishi Electric MELSEC Q Series User Manual

7 ONLINE MODULE CHANGE

7 ONLINE MODULE CHANGE
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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) Perform an online module change by operating GX Developer.
(2) When you want to continue the pre-change operation with the new module after
an online module change, save/restore the buffer memory contents.
POINT
(1) Perform an online module change after making sure that the system outside the
programmable controller will not malfunction.
(2) To prevent an electric shock and malfunction of operating modules, provide
means such as switches for powering off each of the external power supply and
external devices connected to the module to be replaced online.
(3) After the module becomes faulty, the data may not be saved properly.
Therefore, prerecord the data to be saved (the whole buffer memory contents
that can be written, refer to Section 3.5.1).
(4) It is recommended to perform an online module change in the actual system in
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.
(5) Do not install/remove the module to/from the base unit, or the terminal block
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.
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