Mitsubishi Electric MELSEC iQ-R Series User Manual page 184

■Message transmit trigger flags (Un\G8400 to Un\G8402)
Set the send request message slot.
For the message slot set for the send message, turn on the corresponding message slot in this area.
For the message slot set for the receive message, if the corresponding message slot in this area is turned on, the setting is
discarded.
Set the send request message slot in this area, and turn on 'Message transmit trigger request' (Y4). Messages are transmitted
when the send buffer becomes available.
When a message is written to the send buffer, the corresponding message slot in this area will be cleared automatically.
'Message transmit trigger completed' (X4) will turn on when all the messages are written into the send buffer.
Address
Un\G8400
Un\G8401
Un\G8402
APPX
182
Appendix 2 Buffer Memory
Bit Description
b0 Message slot 1
b1 Message slot 2
 
b14 Message slot 15
b15 Message slot 16
b0 Message slot 17
b1 Message slot 18
 
b14 Message slot 31
b15 Message slot 32
b0 Message slot 33
b1 Message slot 34
 
b9 Message slot 42
b10 System area
: 
b15 System area