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8.2 Troubleshooting
8.2.5 "ALM" LED flickers
8
TROUBLESHOOTING
8.2.5 "ALM" LED flickers
8.2.6 "ALM" LED is lit
8.2.7 When Disconnection detection signal (XC) (Q68TD-G-H02 only) or
Disconnection state monitor signal (XC) (Q68TD-G-H01 only)
turns on
8.2.8 Measured temperature value cannot be read
Table 8.6 "ALM" LED flickers
Check Item Remedy
Check for wire disconnection.
Check Disconnection detection signal (XC) (Q68TD-G-H02
only) and Disconnection state monitor signal (XC) (Q68TD-
G-H01 only) and take the action given in Section 8.2.7.
Table 8.7 "ALM" LED is lit
Check Item Remedy
Check for a warning output. Check the warning output flag (Un\G47, Un\G48)
Table 8.8 When Disconnection detection signal (Disconnection state monitor signal) turns on
Check Item Remedy
Check whether the thermocouple or compensation conductor
is connected incompletely or not.
Connect the thermocouple and compensation conductor
correctly.
Check the connected thermocouple, compensation
conductor or cable for wire disconnection.
Make continuity check on the thermocouple, compensation
conductor or cable and change the thermocouple,
compensation conductor or cable if its wire is disconnected.
Check whether the channel where no thermocouple is
connected is set to conversion enable.
Check the channels which are set to conversion enable and
the channels where thermocouples are connected, and set to
conversion enable correctly.
Table 8.9 Measured temperature value cannot be read
Check Item Remedy
Check whether the conversion enable/disable setting (Un\
G0) of the used channel has been set for conversion disable.
Set it for conversion enable in sequence program or GX
Configurator-TI.
Check whether the programmable controller CPU is set for
STOP.
Set the programmable controller CPU for RUN.