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7
ONLINE MODULE CHANGE
7
ONLINE MODULE CHANGE
To perform online module change, read the section about online module change in 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 ensure ease of offset/gain re-setting, there is a user range save/restoration function
(Note)
Dedicated instructions cannot be executed during online module change. When execution
of a dedicated instruction is needed to save and restore data, execute it using another sys-
tem
If no other system exists, restore the data by writing them to the buffer memory.
that is performed by executing the dedicated instruction or read/write from/to buffer
memory.
(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 has failed, data may not be saved properly. Referring to Sec-
tion 3.4.18, therefore, prerecord the data to be saved (offset/gain values of
the industrial shipment settings and user range settings in the buffer mem-
ory).
(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 configura-
tion are correct.
• Switching on/off does not bring any undesirable effect.
(5) Do not install/remove the module to/from the base unit more than 50 times
after the first use of the product. (IEC 61131-2 compliant)
Failure to do so may cause malfunction.
*1
.
*1 If the module is mounted on a remote I/O station, execute save/restoration on another system con-
nected to the main base unit. (Saving and restoration cannot be executed by using a system con-
nected to a remote I/O station.)
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