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MELSEC-Q
8 TROUBLESHOOTING
8.2.5 When A/D conversion completed flag does not turn ON during use in normal mode
Check item Corrective action
Is 24VDC external supply power being supplied? (Q62AD-
DGH only)
Check that the external supply power terminals (terminal
Nos. 16, 17) are supplied with a 24VDC voltage.
Is an input signal error being generated?
Check the input signal error detection flag (buffer memory
address 49: Un\G49).
8.2.6 Checking the A/D converter module status using GX Developer system monitor
When the A/D converter module detail information is selected in GX Developer system
monitor, error code, LED ON status and status of the intelligent function module switch
setting can be checked.
(1) Operating GX Developer
[Diagnostics] [System monitor] Select the A/D conversion module
checking the status.
Module Detailed Information
(2) Module Detail Information
(a) Checking the function version and product information
The function version and product information of the A/D converter module
are displayed in the product information field.
(b) Checking the error code
The error code stored in buffer memory address 19 (Un
\G19) of the A/D
converter module is displayed in the Present Error field.
(When the Error History
button is pressed, the contents displayed in the
Present Error field are displayed in the No. 1 field.)
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