Points with same IOA but different type

[martin-ruby]

In my use case, I receive a setpoint from an IEC-104 client on IOA 1034484 with type C_SE_NC_1. The requirement is to mirror the received value on another point with the same IOA but type M_ME_TF_1, i.e., to acknowledge correct reception.
However, when I call

command = station.add_point(io_address=1034484, type=c104.Type.C_SE_NC_1)
mirror = station.add_point(io_address=1034484, type=c104.Type.M_ME_TF_1)

mirror is None.

How would it be possible to configure the station for this use case?

[F1r3st0rm1979]

I have the same problem my configuration IEC61850-5-104 permit 2 point with same IOA if they have different type in this relaease is not possibile to configure it.

[m-unkel]

Hi there,

Thank you for your question.

To the best of my knowledge, in IEC 60870-5-104, Information Object Addresses (IOAs) must be unique within the same Common Object Address (COA) on a given slave device. This means it is not possible to configure multiple distinct information objects (for example, M_ME_TF_1 and C_SE_NC_1) with the same IOA (e.g., IOA = 1) under the same COA on the same slave.

Accordingly, the current implementation of this module does not support multiple object types sharing the same IOA within a single COA. If you need to change the type of a point while retaining its IOA, the only supported approach is to explicitly delete the existing point and then create a new point using the same IOA with the desired type.

If using two separate IOAs is acceptable in your setup, you can configure the related_io_address for the command point to simplify mirroring behavior. Please refer to the following example: tests/server.py#L86-L104.

While this does not automatically update the value of the monitoring point, it will transmit the related point after successful execution of the command point. As demonstrated in the referenced example, if you update the monitoring point’s value within the on_receive callback of the command point, you can effectively implement a mirrored point using different IOAs.

If you have additional requirements or would like to discuss potential enhancements, please feel free to share more details about your use case. We’re happy to help.

Best,
Martin