Mitsubishi Electric MELSEC iQ-R Series User Manual page 65

Flow of data transmission
The following is the procedure up to the point of sending data.
This section describes the procedure for sending data using message slot 1.
Control by the program
'Data exchange request' (Y1)
'Data exchange completed' (X1)
'Receive/Transmit process
Un\G10003 to
data'
Un\G10006
(Un\G10000 to Un\G10293)
Transmit buffer
Frames on the network
 Set the send data in Un\G10003 to Un\G10006 of 'Receive/Transmit process data' (Un\G10000 to Un\G10293) via the program. ( Page 184 Receive/
Transmit process data (Un\G10000 to Un\G10293))
 Turn on 'Data exchange request' (Y1) via the program.
 Set data is stored in the send buffer of the RJ71CN91 by data exchange.
 When data exchange is completed, 'Data exchange completed' (X1) is turned on.
 Turn off 'Data exchange request' (Y1) via the program. When 'Data exchange request' (Y1) is turned off, 'Data exchange completed' (X1) is also turned off.
 After the send buffer is updated, data is sent under the transmission condition or at the timing corresponding to the setting. ( Page 43 Data transmission
timing)
To execute , the RJ71CN91 module must be in online mode.
'Layer 2 online mode status' (X3) is turned on when 'Layer 2 online mode request' (Y3) is turned on before 
is executed. (The state must be in Layer 2 online mode during network connection except when parameter
change work is performed.)
Ò Ó
SET
MOV/TO instruction
instruction
OFF
Data exchange started
OFF
Transmit data
Ö
RST
instruction
ON
Õ
ON
Data exchange completed
Ô
Transmit buffer updated
Transmit data
×
Data transmission executed
Transmit data
1.11 Layer 2 Message Transmission and Receive
OFF
OFF
1 FUNCTIONS
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