Chapter 14 Module Change During System Operation; Online Module Change - Mitsubishi Electric Q26UD(E)HCPU User Manual

CHAPTER 14
14.1

Online Module Change

An online module change is a function that allows the Q series module mounted on the main base unit or extension
base unit to be changed during system control executed by the Process CPU or Redundant
Using an online module change, the module that failed during control can be replaced with the module of the same
model name.
● An online module change cannot add a module or change the current module for another module.
● When executing an online module change for the Process CPU in the multiple CPU system, it is necessary to specify
"Enable Online Module Change with Another PLC" in the multiple CPU setting of the PLC parameter dialog box.
Also, there are restrictions on the versions of the CPU modules that comprise the multiple CPU system. For details, refer
to the following.
QCPU User's Manual (Multiple CPU System)
● Perform an online module change after confirming that the system outside the programmable controller will not
malfunction.
● To prevent an electric shock, operating module malfunction, etc., provide a switch or similar individually cutting-off means
for the external power supply of the module to be changed online.
● It is recommended to verify that the operations of the unchanged modules will not be affected by executing an online
module change in an actual system beforehand to confirm the following.
• The means and structure that will cut off the connection with the external device are correct.
• ON/OFF of switches, etc. has no influence.
● Do not mount/remove the module onto/from base unit or terminal block more than 50 times (IEC 61131-2 compliant),
after the first use of the product.
Failure to do so may cause the module to malfunction due to poor contact of connector.
Basic
Note 14.1
performance
The Basic model QCPU, High Performance model QCPU, and Universal model QCPU do not support this function.
MODULE CHANGE DURING SYSTEM
OPERATION
High
Universal

CHAPTER 14 MODULE CHANGE DURING SYSTEM OPERATION

Note 14.1
CPU.Note 14.1
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14