Common Item - Mitsubishi Electric MELSEC iQ-F Series User Manual

Common item

The following figure shows the common operations, other operations, and program settings of the Ethernet module when the
BACnet object function is used.
Ethernet module operation
■Operation at startup
'ModuleReady' (Un\G34. b0)
'BACnetStartupRequest'
(Un\G37. b1)
'BACnetDuringStartup'
(Un\G35. b1)
Status of joining/leaving BACnet
SystemStatus
Another property
(1) When the programmable controller system is powered on or is reset, the Ethernet module writes 4: NonOperational to 'SystemStatus' (Un\G8500), and
initializes the buffer memory. After that, 'ModuleREADY' (Un\G34, b0) is turned on.
(2) When 'ModuleREADY' (Un\G34, b0) is detected to be on, the property value set with GX Works3 is written to the buffer memory, and
'BACnetStartupRequest' (Un\G37, b1) is turned on.
(3) The Ethernet module turns on 'BACnetDuringStartup' (Un\G35, b1) and starts the module operation and BACnet communications.
(4) The program writes 0: Operational to 'SystemStatus' (Un\G8500).
(5) When 'SystemStatus' (Un\G8500) is set to 0: Operational, the Ethernet module sets 1: Joining to 'Module status' (Un\G8501).
(6) When 0: 'SystemStatus' (Un\G8500) is not set to Operational, the Ethernet module sets 0: Leaving to 'Module status' (Un\G8501).
Since the Ethernet module is in the process of leaving the BACnet system at startup, it needs to join the
BACnet system. ( Page 46 Joining/Leaving Function)
4 FUNCTIONS
22
4.2 BACnet Object Function
(1) (3)
ON
OFF
OFF
OFF
Leaving BACnet
- 4: NonOperational
Initial value
-
(2)
(5)
ON
ON
Joining BACnet
0: Operational
(4) (6)
Joining BACnet
Leaving BACnet
0: Other than
0: Operational
Operational
...