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MELSEC-Q
3 SPECIFICATIONS
(10) Online module change on a remote I/O station
Online module change is the function for replacing a Q series module mounted
on the main base unit or extension base unit of a remote I/O station while the
station is operating.
Using this function, a faulty module can be replaced with a module of the same
model while the station is operating.
POINT
(1) A new module cannot be added and a module cannot be replaced with
different model by using the online module change.
(2) Perform online module change after confirming that the system outside the
programmable controller system will not malfunction.
(3) In order to prevent electric shocks or malfunction, provide a switch or other
method to turn off the external power supply of the module to be replaced
online.
(4) In order to confirm the content shown below, it is recommended to perform
online module change on an actual system in advance to verify that no error
is found in the operations of the modules out of the scope of change.
• There is no error in the method and configuration for disconnecting
external devices.
• There is no impact on the module by turning on/off the switches.
(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.
(a) Conditions for online module change on a remote I/O station
Online module change can be performed in the following cases:
1) Modules that can be replaced online (hot-swappable) on remote I/O
stations
Hot-swappable modules are listed in the following table.
Module type Restriction
Input module
No restriction Output module
I/O combined module
Intelligent
function module
Analog-digital conversion module
Function version “C”
Channel isolated high resolution analog-digital converter module
Channel isolated high resolution analog-digital converter module
(With signal conditioning function)
Digital-analog converter module
Channel isolated digital-analog module
Temperature control module
Thermocouple input module
Channel isolated thermocouple/micro voltage input module
Channel isolated thermocouple input module
RTD Input Module
Channel isolated temperature input module
Channel isolated pulse input module
Modules other than above cannot be replaced online.
For whether the intelligent function module can be replaced online and
replacement procedure, refer to the manual of the intelligent function
module used.