6. TROUBLESHOOTING
MELSEC-A
6-1
6. TROUBLESHOOTING
The general troubleshooting methods for using AJ65BT-68TD is explained below.
6.1
Cause of Errors and Corrective Actions by LED Indication
The following describes the error confirmation method using the LEDs on AJ65BT-68TD.
For the errors associated with the programmable controller CPU and master module, refer to the
user's manual for the programmable controller CPU and master module, respectively.
(1) When AJ65BT-68TD's "RUN" LED is off
Cause Corrective
action
Watchdog timer error occurred.
Confirm the watchdog timer error with the master module's
special link register, then restart the power to AJ65BT-68TD *1.
If "RUN" LED does not come on after power restart, contact the
nearest representative or branch regarding the problem, as
hardware may be faulty.
24 V DC power is not supplied to AJ65BT-68TD,
or voltage is insufficient.
Check the voltage of 24 V DC power supply.
At test mode, the offset/gain setting switch is
positioned at SET.
After setting offset/gain, position the mode switch to 0
(NORMAL).
(2) When AJ65BT-68TD's "RUN" LED flikers at 0.5-second intervals
Cause Corrective
action
At test mode, the offset/gain setting switch is
positioned at OFFSET or GAIN.
After setting offset/gain, position the mode switch to 0
(NORMAL).
(3) When AJ65BT-68TD's "RUN" LED flikers at 0.1-second intervals
Cause Corrective
action
The all-channel-batch thermocouple selection is
overlapped.
Or, if a thermocouple is selected for each
channel, the selection of a thermocouple is
overlapped for the same channel.
Verify the thermocouple selection, then set a valid
thermocouple using the initial data and switch on the error reset
request flag (RY(n+7)A).
A value out of the allowable setting range was
set for the upper and lower limit of the
temperature measurement range, or the upper
limit value is smaller than or equal to the lower
limit value.
Verify the channel in which a write error has been occurred
using the write data error flag, then set a valid value using the
initial data and switch on the error reset request flag
(RY(n+7)A).
The offset or gain value set in the test mode is
out of the allowable setting range.
Or, the gain value minus offset value is smaller
than 10
°
C.
Verify the allowable setting range and set a valid offset or gain
value.
Or, set the offset and gain values so that the gain value minus
offset value is greater than or equal to 10
°
C.
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