Delta AS Series Manual page 631

Troubleshooting Procedure
Description
Counted result in the latched area is not
retainable (major error)
Module settings in the latched area is not
retainable. (major error)
Module setting error
(major error)
Counter overflow / underflow on CH1
Counter overflow / underflow on CH2
Linear count exceeding the set upper/lower
limit on CH1
Linear count exceeding the set upper/lower
limit on CH2
The variation in relation to a SSI encoder
position exceeding the limit on CH1
The variation in relation to a SSI encoder
position exceeding the limit on CH2
Abnormal SSI communication on CH1
Abnormal SSI communication on CH2
SSI absolute position cross zero point on
CH1
SSI absolute position cross zero point on
CH2
Ch ap te r 14 H igh Spe ed Cou n te r Mod ul e AS02HC
Counted data is lost. Switch the module power OFF and ON again. The
error code is cleared by the system. Contact the factory if the problem
persists.
Module setting data is lost. Switch the module power OFF and ON
again. Download the HWCONFIG settings again to clear the error code.
Contact the factory if the problem persists.
Check if the setting in HWCONFIG is consistent with the actual
placement. Contact the factory if the problem persists.
Check the counter result. If the alarm is not required, disable the alarm
output function in HWCONFIG. Use any of the followings to clear the
error code: clear, reset, preset the counter, restart the module, or
execute DHCCNT instruction again.
Check the signal received by channel 1 and 2.
Hardware counter is still counting; when the number is back within the
range of the maximum to the minimum, the error code will be cleared.
Check if there is any interruption and check the device specification to
see if the offset setting is matching with the actual placement.
Check the execution of DHCCNT instruction. If it is parity check, check if
there is any interruption and check if the data format is correct. Check if
the device wiring is secure, and if the encoder power supply is normal.
Check the SSI absolute encoder specification and modify the setting
accordingly. If the alarm is not required, disable the alarm output function
in HWCONFIG. Use any of the followings to clear the error code: clear,
reset, preset the counter, restart the module, or execute DHCCNT
instruction again.
Solution
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