Mitsubishi Electric MELSEC iQ-R Series User Manual page 58

■When the receive end code is changed and an arbitrary code is designated (designate from
0000H to 00FFH)
(User defined receive end code data is added to the end of the message and transmitted from the target device).
When C24 receives the receive end code data changed by the user, it stores the received data up to the receive end code in
the receive area on the buffer memory and turns ON the 'CH reception data read request' (X3/XA) to the CPU module.
Target device
C24
Reception data read request (X3/XA)
■When the receive end code is not designated (FFFFH designated)
Reading by the receive end data quantity is enabled.
For more information on reading by the receive end data quantity, refer to the following section.
Page 56 Data reception by receive end data quantity (for fixed length reception)
Data reception by receive end data quantity (for fixed length reception)
• This method is used to receive messages of the same length (size) from the target device every time.
• When C24 receives data equivalent to the receive end data quantity preset with Engineering tool by the user, it issues a
reception data read request to the program.
Upon the read request by the C24, the program reads the data equivalent to the receive end data quantity from the target
device.
• The receive end data quantity default value is set to 511 (words). However, it can be changed within the receive data
storage area depending on the data contents exchanged with the target device.
3 DATA COMMUNICATION USING NONPROCEDURAL PROTOCOL
56
3.1 Receiving Data from Target Device
Receive complete code data