T_SPx70 Data Types

[SCADAPro52]

Can the alarm setpoints on a T_SPx70_Analog point be changed programmatically i.e. via logic? Unable to find an answer in the documentation.

[Joel_Weder]

Hello SCADAPro52,

Yes, it certainly is possible to write to the configurable limits which are attributes of the  T_SPx70_Adv_Analog objects. These can be set initially on the Alert Notifications tab for an advanced analog object, but those initial values often need to change. You can also assign a Modbus or DNP3 register to these attributes, so you can write to them remotely.

[AlastairF]

The Object DNP3 or ModBus address exists for the Object value. In the case of ModBus there is no address that can be assigned to say Limit 3H.

When you use the T_SPx70_ADV_ANALOG Logic variable type, the parameters (in most cases) may be written to by logic.  this starts to get messy as you have to create a second object with logic variable and assign that a ModBus address and map across to the original parameter. Typically you need to do this when there is a local HMI as a user interface. Ideally you should make these changes on the original object via GEO SCADA as one point of truth.

Another option in Logic is to use the OBJ_WriteField function block. This can also be used in conjunction with OBJ_DNP3PointToID command if the object doesn't have a Logic variable type associated with it.

This is a very powerful and flexible command. I have used it to assign a fixed timestamp to an object before creating an event.

[SCADAPro52]

Thanks for the reply Joel.  That is what I thought.

However, I'm not clear on how to assign a DNP3 variable to the attribute.  

Where can I find assistance on this?

Appreciate the assist on this!

[Joel_Weder · Accepted solution]

Hi SCADAPro52,

As pointed out by Alastair after my first post, I was incorrect in saying that a Modbus or DNP3 address could be assigned to an attribute of an object directly. It can be done via other means, which I'll mention in a moment. But in fact what you can do is assign a DNP3 or Modbus address to the object as a whole.

After creating a new Project in RemoteConnect with the appropriate options, you go to the Objects tab and then Object Configuration. Scroll down to the analog object in question and double-click on it. Set the object to be a T_SPx70_ADV_ANALOG type, then a bit further down in the same window click on the DNP3 (or Modbus) tab for that object. After assigning a point number, you can configure the DNP3 Group & Variation, and a data class.

I missed one item regarding how to write to an attribute remotely. What I'd do is create a new object with a DNP3 point #, just for external communication, that can be written to by a DNP3 SCADA host or HMI. Then add a bit of logic to copy that value to the level attribute.  It would be accessed as (for example) PIO_SP575_AI1.L1_LIMIT

[SCADAPro52]

Thanks for the guidance with this topic.

I was able to figure out how to access the object parameters and configure the logic necessary to set the alarm values for two different points at the same time.  Also, will be configuring system to only allow remote (SCADA) changes to setpoints and not local changes to comply with CRM regulations.

Appreciate the assist Gentlemen!