M172 BACnet Communication with Other Controllers Example Needed

[KrzysztofSoczewka]

Hi,

I’m looking for a simple working example of BACnet communication from a Schneider Electric M172 (28–42 I/Os) to another BACnet device (any third-party controller), especially writing values (WriteProperty).

Does anyone have a sample project or configuration?

Thanks!

[FedericoM · Accepted solution]

Hi,

this functionality will be available with ESME HVAC 1.10 which will be released in the coming weeks.

These functions will be available:

• sysBACnet_RemRead() sends BACnet ReadProperty-A
• sysBACnet_RemWrite() sends BACnet WriteProperty-A
• sysBACnet_GetRequestStatus() monitors the status of the command sent to a server

Read and Write will be supported on the following objects and properties:

[KrzysztofSoczewka]

Hi,

Thank you for the information.

Could you please provide a simple example of how to use sysBACnet_RemRead(), sysBACnet_RemWrite(), and sysBACnet_GetRequestStatus()?

I am particularly interested in a complete example showing:

• Reading a BACnet Analog Value object from a remote device
• Writing a value to a remote BACnet object
• Monitoring the request status using sysBACnet_GetRequestStatus()
• Typical parameter values and the recommended sequence of function calls

A small Machine Expert HVAC project example or code snippet would be greatly appreciated.

Thank you in advance.

[MargheritaM · Accepted solution]

Hi,

I am sharing with you an example project in which the TM172P operates as a BACnet client. In this example, it is possible to both read and write values from/to BACnet servers available on the network.

For implementing the read and write operations, we have used BACnetRemoteRead and BACnetRemoteWrite function blocks from the BACnet_Addons library, which is attached to this message in a beta version. These function blocks internally make use of the functions sysBACnet_RemRead(), sysBACnet_RemWrite(), and sysBACnet_GetRequestStatus(). By using the provided FBs, the interaction with these low-level functions is simplified, making the implementation more straightforward.

At the moment, this project should be considered as a starting example rather than a complete reference implementation.

If you have any feedback or additional requirements, we would be happy to review them and further improve the example accordingly.

Please let me know if you need additional clarification.
Margherita