Alm" Led Flickers; Alm" Led Is Lit; When Disconnection Detection Signal (Xc) (Q68Td-G-H02 Only) Or Disconnection State Monitor; Measured Temperature Value Cannot Be Read - Mitsubishi Melsec-Q Series User Manual

8
TROUBLESHOOTING
8.2.5

"ALM" LED flickers

Check Item
Check for wire disconnection.
8.2.6

"ALM" LED is lit

Check Item
Check for a warning output.
8.2.7 When Disconnection detection signal (XC) (Q68TD-G-H02 only) or
Disconnection state monitor signal (XC) (Q68TD-G-H01 only)
turns on
Table 8.8 When Disconnection detection signal (Disconnection state monitor signal) turns on
Check Item
Check whether the thermocouple or compensation conductor
is connected incompletely or not.
Check the connected thermocouple, compensation
conductor or cable for wire disconnection.
Check whether the channel where no thermocouple is
connected is set to conversion enable.
8.2.8

Measured temperature value cannot be read

Check Item
Check whether the conversion enable/disable setting (Un\
G0) of the used channel has been set for conversion disable.
Check whether the programmable controller CPU is set for
STOP.
Table 8.6 "ALM" LED flickers
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 the warning output flag (Un\G47, Un\G48)
Connect the thermocouple and compensation conductor
correctly.
Make continuity check on the thermocouple, compensation
conductor or cable and change the thermocouple,
compensation conductor or cable if its wire is disconnected.
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
Set it for conversion enable in sequence program or GX
Configurator-TI.
Set the programmable controller CPU for RUN.
Remedy
Remedy
Remedy
Remedy
8.2 Troubleshooting
8.2.5 "ALM" LED flickers
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