6DATA COMMUNICATION USING THE NON PROCEDURE PROTOCOL MELSEC-Q

(2)Reception by received data count (For fixed length reception)

(a)This method is used to receive messages of the same length (size) from the external device every time.

(b)When the Q series C24 receives data of the received data count preset in GX Configurator-SC by the user, it sends a reception data read request to the sequence program.

When the sequence program receives the read request from the Q series C24, it reads data up to the received data count received from the external device.

(c)The received data count default value is set to 511 (words). However, it can be changed within the size of the receive data storage area depending on the data contents exchanged with the external device.

POINT

(1)When the receive complete code and received data count are set to GX Configurator-SC, both become valid.

In this case, if the Q series C24 receives the receive complete code before data corresponding to the received data count, it outputs (X3/XA: ON) a reception read request signal to the sequence program.

(2)For details on how to change the receive complete code and received data count, see Section 8.4.7.

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