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MELSEC-Q
8 ONLINE MODULE CHANGE
CHAPTER 8 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 functions of an online module change. Perform an online
module change by operating GX Developer.
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) To prevent an electric shock, always turn OFF the input pulse signal from the
pulse generator connected to the module to be changed online.
(4) After the module has become faulty, the buffer memory contents cannot be
confirmed. Therefore, prerecord the settings (The whole buffer memory
contents that can be written refer to Section 3.4.1).
(5) 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.
(6) 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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