Online Module Change - Mitsubishi Electric MELSEC-Q Series User Manual

7 ONLINE MODULE CHANGE

7 ONLINE MODULE CHANGE
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To change a module online, read the "Online Module Change" section of the QCPU
User's Manual (Hardware Design, Maintenance and Inspection).
This chapter describes the specifications of an online module change.
(1) Perform an online module change by operating GX Developer.
(2) To continue the same operation with a new module after the module is replaced,
save and restore the data in the buffer memory.
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.
Back up the save-target data (the entire write-enable area in the buffer memory)
in advance (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) After the first use of the product, do not mount/remove the module to/from the
base unit, and the terminal block to/from the module more than 50 times (IEC
61131-2 compliant) respectively.
Exceeding the limit of 50 times may cause malfunction.
MELSEC-Q
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