Chapter 3 Programming
3 – 91
(*1) OK LED is not lighting up
If error code 13 is detected, OK LED is not lighting up and it is not possible to communicate with HX-CODESYS
because the system program or boot project is failure. If cycling power does not solve the problem, boot project could
be failure. In this case, it is possible not to load boot project from flash memory.
< Unloading boot project >
(1) Remove power from the PLC
(2) Slide No.1 to 4 of the dip switch 2 to the right side (ON).
(3) Supply power to the PLC and check if OK LED is lighting up.
(4) Login and create boot project to restore your system.
(*2) 21 Error
If power failure time of the PLC exceeds 12 hours, data in variables configured as RETAIN (backup by optional
battery or capacitor in the unit) are not retained (undefined values). When PLC is powered up with RETAIN data
undefined values, behavior of PLC can be selected in the setting [Retain mismatch] of HX-CODESYS. If this setting
is RUN (default), PLC starts with all RETAIN data initialized. (If RUN/STOP switch is in STOP position, PLC does
not start regardless of the setting.)
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