Mitsubishi Melsec-Q Series User Manual page 462

12.4 Module Change during System Operation
This section explains how to change the module online (with power on) without stopping the system.
12.4.1 Online module change
An online module change
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
"Online module change enable for other CPU" 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.
Note1
Basic
Note12.15
The Basic model QCPU, High Performance model QCPU and Universal model QCPU are not
compatible with an online module change.
12 - 167
is a function that allows the Q series module mounted on the main base unit or
Note12.15
High
Universal
performance
CPU.Note1