AS Series Module Manual 
14-32 
  Troubleshooting 
  Error Codes 
Error 
Description 
ERR 
Remark 
16#1605 
Counted result in the latched 
area is not retainable (major 
ON 
The counter 
module stops 
operating and 
counting 
The error alarm makes the CPU 
stop the system. (The module need 
be set to keep counting or stop for 
when an error occurs in the module:) 
16#1606 
Module settings in the latched 
area is not retainable. (major 
16#1607 
Module setting error   
(major error) 
16#1800 
Counter overflow / underflow 
on CH1 
Blinking 
Linear counter: 
Counting stops.   
 
Ring counter: 
Counting 
continues. 
Linear counter: 
Counter value overflow inside the 
hardware 
Ring counter: 
After the Ring Counter 
Overflow/Underflow Detect function 
is enabled in the Alarm Setting of 
HWCONFIG, the alarm will appear 
when the overflow or underflow 
16#1801 
Counter overflow / underflow 
on CH2 
16#1802 
Linear count exceeding the set 
upper/lower limit on CH1 
Blinking 
The counting value 
is fixed at the set 
max. counter value 
or the set min. 
counter value. 
The counting inside the hardware 
persists. When the internal counter 
value is back within the valid range, 
the counter returns to normal and 
the counting value is refreshed. 
16#1803 
Linear count exceeding the set 
upper/lower limit on CH2 
16#1804 
The variation in relation to an 
SSI encoder position 
exceeding the limit on CH1 
Blinking 
The counting value 
is fixed at the most 
recent correct count 
value. 
The variation between two 
consecutive SSI positions exceeds 
the setting value. 
16#1805 
The variation in relation to an 
SSI encoder position 
exceeding the limit on CH2 
16#1806 
Abnormal SSI communication 
on CH1 
Blinking 
The counting value 
is fixed at the most 
recent correct count 
value. 
Encoder disconnection/ wiring 
error/no power supply to the 
encoder/ data format error/parity 
check setting error 
(Error log will not appear unless five 
consecutive abnormal situations 
16#1807 
Abnormal SSI communication 
on CH2 
16#1808 
SSI absolute position cross 
Blinking  Counting continues. 
After the SSI Zero Crossing Detect 
function is enabled on the Alarm 
Setting tab page of the HWCONFIG 
software, the alarm will appear as 
the absolute position of the SSI 
encoder crosses the zero position. 
16#1809 
SSI absolute position cross 
zero point on CH2