Operation Of A Bacnet Module - Mitsubishi Electric MELSEC iQ-R User Manual

Operation of a BACnet module

Operation at startup
A BACnet module initializes an access block for COV interaction with '0' at the startup of the module.
Operation when a COV notification is received
■ Storage of a COV notification to an access block for COV interaction
• When a COV notification is received from the send source object set to an access block for COV interaction, a BACnet
module stores the received COV notification to the access block for COV interaction while the CONTROL is '0' (idling).
Then, '1' (COV notification reception complete) is stored to the CONTROL.
• If a new COV notification is received while the CONTROL is '1' (COV notification reception complete), the new COV
notification will be discarded without storing to the access block for COV interaction.
• With the following setting, the StatusFlags and PresentValue of an access block for COV interaction can be
updated (overwritten) every time when a new COV notification is received. This makes it unnecessary to
store '0' to the CONTROL after reading data.
Set '1' to "RecDataOverwriteCOVLink" in [Settings]  [Basic Information]  [BACnet Detail Setting] button
 [Edit] button  "Interaction".
■ Interaction with BACnet monitoring function
By setting the following item, when a COV notification is received from the property specified with the BACnet monitoring
function, a BACnet module stores the property values to an access block for BACnet monitoring.
Set '1' to "MonitorDataSetByCOV" in [Settings]  [Basic Information]  [BACnet Detail Setting] button  [Edit] button 
"Interaction".
Precautions
• Be sure to store '0' (idling) to the CONTROL after reading the data of a COV notification.
The StatusFlags and PresentValue are not updated while the CONTROL is '1' (COV notification reception complete).
(Page 149 Storage of a COV notification to an access block for COV interaction)
1 FUNCTIONS
1.7 COV Interaction Function
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