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MELSEC-Q
6 DATA COMMUNICATION USING THE NON PROCEDURE PROTOCOL
• If the next data (LF, etc.) is not received within the time set in the non
reception monitoring time (timer 0) after CR is received, the Q series
C24 stores the received data up to CR to the buffer memory receive
data storage area and turns on the following signals to the PLC CPU.
When non procedure and non reception monitoring time format is 0:
Reception abnormal detection signal (X4/XB)
When non procedure and non reception monitoring time format is 1:
Reception data read request signal (X3/XA)
1
Reception abnormal detection signal
(X4/XB)
Timer 0
set time
C
R
Q series C24
External device
( 2)
[Format is 0]
Reception data read reqest signal
(X3/XA)
[Format is 1]
1 In non procedure protocol, a message is received by the increase in
non reception monitoring time (timer 0) if the received complete code
and the received data count are not decided.
For the non procedure protocol at the non reception monitoring time
format, see Chapter 6 of the User’s Manual (Application).
2 CR is included as 1 byte of data included in the message.
2) When the receive complete code is changed and an arbitrary code is
designated (00
H
designated)
(User defined receive complete code data is added to the end of the
message and sent from the external device).
When the Q series C24 receives the receive complete code data
changed by the user, it stores the receive data up to the receive complete
code to the buffer memory receive area and turned on the read request
signal to the PLC CPU.
External device
Reception data request signal
(X3/XA)
Receive complete code data
Q series C24
3) When receive complete code not designated (FFFF
H
designated)
Reading by received data count is enabled.
See (2) for a description of reading by received data count.