Mitsubishi Electric MELSEC iQ-R Series User Manual page 44

Flow of data transmission
The following is the procedure up to the point of sending data. In this procedure, the communication process data is updated
by refreshing.
Control by the program
Device in the CPU module
NMT state
TPDO (Un\G13000 to Un\G14023)
Network input variable object
(Index: A000H to A242H)
Transmit data on the network
(1) NMT master start/remote node start
(2) Refresh
(3) MOV/TO instruction
(4) Pre-operational
(5) Operational
 The autostart or remote node start function changes the NMT state of the RJ71CN91 to "Operational". ( Page 18 NMT state)
 The transmission data is set in the device of the CPU module via the program.
 When the refresh is performed, data in the device of the CPU module is written to 'TPDO' (Un\G13000 to Un\G14023).
 When the refresh is complete, data of Network input variable object (index A000H to A242H) corresponding to the TPDO are updated.
 After the object data is updated, the data will be sent under certain conditions or at a certain timing depending on the TPDO setting.
1 FUNCTIONS
42
1.4 PDO
Ò
(1)
Ó
Data A
(4)
Ô
(2)
(3)
Data B
(5)
Data written
Data A
Õ
Data updated (replaced)
Data A
Data B
Data B
Ö
Data transmitted
Data B