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6. TROUBLESHOOTING MELSEC-A
6-1
6. TROUBLESHOOTING
The details of the errors which may occur when using the AJ65BT-64DAV/DAI and troubleshooting are
described.
6.1 Error Code List
When the data is written from the programmable controller CPU to the master module, and an error
occurs (AJ65BT-64DAV/DAI RUN LED flashes), the error code is stored to the AJ65BT-64DAV/DAI
remote register RWrn+4.
Refer to Section 3.6.5 for the error code.
6.2 Troubleshooting
A simple troubleshooting method for using the AJ65BT-64DAV/DAI is described.
Refer to the programmable controller CPU and Master Module User's Manuals regarding problems
related to the programmable controller CPU and master module.
(a) When the AJ65BT-64DAV/DAI RUN LED is flashing
Check item Corrective action
There in an error in the write data. Check the cause of the error using the error code,
and correct the sequence program.
Is there a short between the TEST terminals (test
mode)?
Release between the TEST terminals after adjusting
the offset/gain.
Is it flashing in 0.1s intervals (fast-speed) in test
mode?
Change the offset/gain adjustment to within the
allowable range.
(b) When the AJ65BT-64DAV/DAI RUN LED is off
Check item Corrective action
Is the 24VDC power on? Check the power. (External power supply)
Is the 24VDC power voltage at the regulated value? Set the voltage within the range 18 to 30V.
Is there a short between the TEST terminals(test
mode)?
Release the TEST terminal after adjusting the
offset/gain.
(c) When the AJ65BT-64DAV/DAI LINK RUN LED turns off
Refer to the master module troubleshooting section.
(d) When the AJ65BT-64DAV/DAI LINK ERR LED is flashing
Check item Corrective action
<Flashing at regular intervals>
Was the station number or baud rate switch setting
changed during normal operation?
Return to the station number or baud rate used
during normal operation.
Check whether the termination resistors are fitted or
not. If not, connect them and switch power on again.
<Flashing at irregular intervals>
• You forgot fitting the termination resistors.
• The module or CC-Link dedicated cable is affected
by noise.
• Earth both ends of the shield wire of the CC-Link
dedicated cable to the protective earth conductors
via SLD and FG of the corresponding module.
• Securely earth the FG terminal of the module to
the protective earth conductor.
• Securely earth the piping when running the wiring
inside piping.
(e) When the AJ65BT-64DAV/DAI LINK ERR LED is on
Check item Corrective action
Is the station number of baud rate setting correct? Set a correct station number or baud rate.
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