Mitsubishi Electric MELSEC iQ-R Series User Manual page 49

Flow of receiving data
The following is the procedure of receiving data.
Control by the program
Device in the CPU module
NMT state
RPDO (Un\G10000 to Un\G11023)
Network output variable object
(Index: A480H to A6C2H)
Receive buffer
Receive data on the network
(1) NMT master start/remote node start
(2) Refresh
(3) MOV/FROM 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 RJ71CN91 stores data in an RPDO when it receives data.
 At the timing defined in the RPDO setting, the received data is stored in Network output variable object (index A480H to A6C2H) mapped to the object
'PRDO' (Un\G10000 to Un\G11023) of the object dictionary that is mapped to the RPDO. ( Page 48 Timing of receiving data)
 When the data is transferred to the object, the data in 'RPDO' (Un\G10000 to Un\G11023) corresponding to the object is updated.
 When the refresh is performed, data in the RPDO is read to the device of the CPU module.
 The data received in the device of the CPU module is referenced by the program.
Ò
(1)
(4)
Data A
Data A
Data B
Ö
(2)
×
Data A
(5)
Data read
Data A
Õ
Data updated (replaced)
Data B
Ô
Data transferred
Data B
Ó
Data received
(3)
Data B
Data B
1 FUNCTIONS
1.4 PDO
1
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