Mitsubishi Electric MELSEC-Q Series User Manual page 242

7 ONLINE MODULE CHANGE
7 - 11
(c) Check that the RUN LED of the module is off, disconnect the external
cable, and remove the module.
POINT
(1) If the terminal block is removed, the measured temperature may vary within the
accuracy range due to the individual differences of the cold junction temperature
compensation resistors (for the thermocouple input only).
(2) Do not forget to remove the module. If the installation confirmation is executed
without removing the module, the module does not start up properly and the
RUN LED does not turn on.
(3) Mounting a new module
(a) Mount a new module in the same slot and connect external cables.
(b) When the module is mounted, click the [Execution] button and check that
the RUN LED is on. Module ready flag (Xn3) remains off.
MELSEC-Q
7 - 11