Delta AH500 Programming Manual page 562

AH 5 00 Pr ogr am m ing Ma n ua l
OFF after the data which has been received is processed. Please do not execute the
instruction RST continuously.
5. If the command which the PLC receives includes a special character (SR621), I32 will be
triggered. The value in D30 will increase by one.
Example:
The interrupt task (I32):
6 - 3 9 4