Symbolic Adddressing driver - Siemens 1500

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Symbolic Adddressing driver - Siemens 1500
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  • HMI Model: cMT3162X (V2)
  • EasyBuilder Pro Version: 6.10.01.510 Build 2025.10.22

Hello everyone.

I had a fully working project with absolute addressing driver communicating succesfully with Siemens PLC 1500 (Tia portal V20).

I migrated that project into Symbolic Addressing driver since it gives me way more advantages both in PLC and EBPro itself. The result of migration however was that HMI was not connecting properly with PLC

Just for testing I created a empty EBPro project, imported same tags and just started to test step by step, first some bit lamp, then some word, etc… Even that I managed to connect to PLC everytime I had random “Device no response” errors until it finally connected. Then I had some inconsistencies it random tags showing **** sometimes

TIA Project is huge but with Absolute addressing I had no problems so I am now thinking into rolling back but it’s not as easy since many tags get unmapped, etc… it’s a pain in the ■■■.

Any experiences TIA V20 projects in symbolic addressing, any advices?

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Update:

After 1+ hour mapping stuff to get project back to absolute addressing, the communication worked first try again.

There is something with symbolic addressing that I’m missing but it just doesn’t work properly

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Hi @Javier ,

Thank you for contributing to our forum.

The Siemens S7-1200 (Symbolic Addressing) (Ethernet) is a legacry drivers of ours. Could you switch to the Siemens S7-1200/S7-1500 (S7CommPlus, Symbolic Addressing) (Ethernet) or Siemens S7-1200/S7-1500 (Absolute Addressing) (Ethernet) driver and let me know if the issue is still present.

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Hello @Aaron.S

Yes the tests I made were with S7-1200/S7-1500 drivers. I gave up with symbolic addressing it’s somehow very inconsistent, seems to work but then stops working properly I don’t know. I also checked that all arrays start from 0 but even that sometimes it doesn’t work while another tests with array starting from 1 works.

Absolute addressing like I said works like a charm but I lose so many benefits (strings work better in symbolic, indexing function in EBpro works better, non-optimized DBs have a limited capacity of 65535…)

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@Javier,

Is communication also inconsistent when using the Siemens S7-1200/S7-1500 (S7CommPlus, Symbolic Addressing) (Ethernet) driver?

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Yes…
With a brand new project after some tries it connects, even that shows “Device no response” starts to communicate after a while if I wait. That is with one DB with two ints array.

When I upload the full project (more than 100.000 bits of variables) it doesn’t work, if I wait like previously some variables shows randomly but keeps disconnecting constantly. My project uses a lot of UDTs, arrays, udt tags. Maybe it is too much for symbolic

I was thinking that some mapping was wrong but after changing to absolute driver it worked first time

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@Javier,

During the test where it started to communicate after a while, was the HMI connected to the PLC using a switch or via a direct Ethernet connection?