PLC UDT and Indirect adressing (multiplexing)

Dear Siemens

I've been trying to use indirect adressing for an Array of a PLC UDT, but it seems it's not possible. Attached you can see a photo of what I've been trying:

Create HMI tag of PLC UDT, where the PLC UDT is of DB_Array.UDT[0...5]

Generate index tag under Properties > General > Address: UDT_Index of type Int

Hi Lang,

There are two ways to access the tag 

1.Absolute accessing-where you can access with the tag by selecting the DB-no and WORD-no of the db for example.

2.symbolic addressing-where used in accessing of array of tags by selecting the index.

here i have attached the symbolic addressing of plc udt tags from data block.

Hey Balak,

Option 1:

What I'm trying to do, is accessing Elements of an array, which is of UDT type. I've created a DB with array: [0...5] of type "udt"

Then i create an HMI tag, which is of type "udt" and the PLC tag is DB.Array[0], then i try to add a index, so i can index through a single HMI tag of, with PLC address. DB.Array[index], so i can access udt's of data, instead of slice accessing every single bit and byte...

I'm trying to see if i can create a more intelligent faceplate, where all i would have to do, is. eg. know which element is which sensor, so when i create a new faceplate, in order to interface it all i would have to do is set the index tag to 0...5 

Option 2:

I tried multiplexing instead, but inserting every single value for the UDT, then accessing from an index, if i have over 20 tags in my UDT, seems like a BIG hassle... 

you can find following information in WINCC V13 SP1 update 3 readme. So i guess you can not use this function in version V13 SP1 update 3 or later. 

When multiplexing symbolic addresses, user data types cannot be used as multiplex tags.
 

hyfwei

you can find following information in WINCC V13 SP1 update 3 readme. So i guess you can not use this function in version V13 SP1 update 3 or later. 

When multiplexing symbolic addresses, user data types cannot be used as multiplex tags.
 

 That's right. I'm struggling with it at the moment. Do you know what an alternative to that could be?

Miguel.Romed

 

hyfwei

you can find following information in WINCC V13 SP1 update 3 readme. So i guess you can not use this function in version V13 SP1 update 3 or later. 

When multiplexing symbolic addresses, user data types cannot be used as multiplex tags.
 

 That's right. I'm struggling with it at the moment. Do you know what an alternative to that could be?

 Was trying to do same thing but without luck. I will ask directly from siemens how this is possible. Only thing comes in my mind is cyclically call VB script and do multiplexing there manually (not sure if VB script likes UDT from PLC)

I will report back later if I find something.

Toni Lepistö

 

Miguel.Romed

 

hyfwei

you can find following information in WINCC V13 SP1 update 3 readme. So i guess you can not use this function in version V13 SP1 update 3 or later. 

When multiplexing symbolic addresses, user data types cannot be used as multiplex tags.
 

 That's right. I'm struggling with it at the moment. Do you know what an alternative to that could be?

 Was trying to do same thing but without luck. I will ask directly from siemens how this is possible. Only thing comes in my mind is cyclically call VB script and do multiplexing there manually (not sure if VB script likes UDT from PLC)

I will report back later if I find something.

Have you found a solution ? I am interested

Thank you

Lang

Hey Balak,

Option 1:

What I'm trying to do, is accessing Elements of an array, which is of UDT type. I've created a DB with array: [0...5] of type "udt"

Then i create an HMI tag, which is of type "udt" and the PLC tag is DB.Array[0], then i try to add a index, so i can index through a single HMI tag of, with PLC address. DB.Array[index], so i can access udt's of data, instead of slice accessing every single bit and byte...

I'm trying to see if i can create a more intelligent faceplate, where all i would have to do, is. eg. know which element is which sensor, so when i create a new faceplate, in order to interface it all i would have to do is set the index tag to 0...5 

Option 2:

I tried multiplexing instead, but inserting every single value for the UDT, then accessing from an index, if i have over 20 tags in my UDT, seems like a BIG hassle... 

 Il been working with TIA Portal V13 SP9 and it do not support Option 1 but work great with Option 2

I also work with TIA Portal V14 and it support Option 1.

I'm not sure you can use the VB scriting to bypass this limitation because the tag acces is base on the same tag access technology.

New question published by Pepijn van der Ven is split to a separate thread with the subject In the HMI I want to create a multiplexed tag with an index to connect the PLC DB.

Best regards
Min_Moderator