Mitsubishi Q Series User Manual page 217

7 ONLINE MODULE CHANGE
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(c) After confirming that the RUN LED of the module has turned off, disconnect
the external wiring and dismount the module.
POINT
(1) If you have removed the wiring together with the terminal block, the temperature
measurement values may vary within the accuracy range due to the error of the
specific cold junction temperature compensation resistor. (Only when input
range is thermocouple.)
(2) Always dismount the module. If mounting confirmation is made without the
module being dismounted, the module will not start properly and the RUN LED
will not be lit.
(3) Mounting of new module
(a) Mount a new module to the same slot and connect the external wiring.
(b) After mounting the module, click the [Execution] button and make sure that
the RUN LED is lit. Module Ready Flag (Xn3) remains OFF.
MELSEC-Q
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