Writing to multiple tags with the same name

[Former Member]

Hi,

I am writing to multiple tags with the same name but in different groups. I have noticed only the tag from the first group gets updated. How can I write to a tag in a specific group in this scenario?

Regards,

Chanti.

[Former Member · Accepted solution]

What is the tag source. SCADA or historian?

[Former Member · Accepted solution]

I am communicating with a PLC using KEPware OPC DA server.

Chanti.

[Former Member · Accepted solution]

Can you do somethng like a <GroupName>.<TagName>?

[Former Member · Accepted solution]

Can't change anything on the OPC end. The structure is fixed. Changing it involves lot of effort and lacks anybody's support. Why is MII indifferent to tags with the same name?

[Former Member · Accepted solution]

I was actually referring to the MII side.

Not sure if this is even possible but something like

http://<server>:<port>/XMII/Illuminator?Server=<Name of the TAG DataServer>&Mode=CurrentWrite&TagName=<Group>.<TagName>

[Former Member · Accepted solution]

Heres what I found.

When I tried "http://<server>:<port>/XMII/Illuminator?Server=<Name of the TAG dataServer>&Mode=CurrentWrite&TagName=<Group>.<TagName>", the outcome was "Message

Could not add "<Group>.<TagName>" to the response list.

Message

No tags selected."

When I tried "http://<server>:<port>/XMII/Illuminator?Server=<Name of the TAG dataServer>&Mode=CurrentWrite&TagName=<TagName>", it seemed like it worked fine.

Any thoughts?

[Former Member · Accepted solution]

Which would mean that MII doesn't recognize the tag, May be its some setting/config down in your UDS that enables browsing tags using the group names.

Let me see if I can find something else.

[Former Member · Accepted solution]

I believe it did work. The expression is -

http://<server>:<port>/XMII/Illuminator?Server=<Name of the TAG dataServer>&Mode=CurrentWrite&TagName=<Group>.<Subgroup1>.<Subgroup2>...<SubgroupN>.<TagName>"

Full points to you.

Regards,

Chanti.

[Former Member · Accepted solution]

Although it would be nice to know how to input the group/subgroups in the form of parameters in a tag query action block. Rather than typing the name of the tag as <group>.<subgroup1>....<tagname>?

[Former Member · Accepted solution]

Well there are other modes for the Data server that can help you retrieving the Group List as well as the Tag List.

Play with these modes and I am sure you would be able to build your URL dynamically coz I agree theres no fun just typing out the TAG Name.