Alm" Led Flickers; Alm" Led Is Lit; Disconnection State Monitor Signal (Xc) Has Turned On; 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

Disconnection state monitor signal (XC) has turned 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
Table 8.7 "ALM" LED is lit
Table 8.8 Disconnection state monitor signal (XC) has turned on
Table 8.9 Measured temperature value cannot be read
Remedy
Check the disconnection state monitor signal (XC) and take
the action given in Section 8.2.7.
Remedy
Check the warning output flag (Un\G47, Un\G48)
Remedy
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.
Remedy
Set it for conversion enable in sequence program or GX
Configurator-TI.
Set the programmable controller CPU for RUN.
8.2 Troubleshooting
8.2.5 "ALM" LED flickers
1
2
3
4
5
6
7
8
8
- 5