6 DATA COMMUNICATION USING THE NON PROCEDURE PROTOCOL
(4) Retry processing for data reception errors
The data when reception error occurred is discarded and only the data for the normal reception is taken into the Q series C24. For this reason, the reception message may be missing data when an error occurs. To assure the correct transmission and reception of data it is recommended that a normal/error response message is received and a response message reception timeout check is conducted for data transmitted between the PLC CPU and the external equipment and that measures be taken when an error message is received or when an error timeout occurs, such as retransmitting the data (transmission retry).
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