# Bad tags in all my OPC Modbus communication PLC

**URL:** <https://forum.inductiveautomation.com/t/bad-tags-in-all-my-opc-modbus-communication-plc/79765>\
**Category:** Ignition\
**Created:** [September 28, 2023, 6:21am UTC](https://forum.inductiveautomation.com/t/bad-tags-in-all-my-opc-modbus-communication-plc/79765 "2023-09-28T06:21:26Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![ArvindKumar\_Muthukri](https://avatars.discourse-cdn.com/v4/letter/a/a5b964/32.png) [@ArvindKumar\_Muthukri](https://forum.inductiveautomation.com/u/ArvindKumar_Muthukri)\
**Post date:** [September 28, 2023, 6:21am UTC](https://forum.inductiveautomation.com/t/bad-tags-in-all-my-opc-modbus-communication-plc/79765/1 "2023-09-28T06:21:26Z")

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in my tags section all my opc tags showing bad value why

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**Author:** ![justinedwards.jle](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/justinedwards.jle/32/37854_2.png) [@justinedwards.jle](https://forum.inductiveautomation.com/u/justinedwards.jle)\
**Post date:** [September 28, 2023, 6:39am UTC](https://forum.inductiveautomation.com/t/bad-tags-in-all-my-opc-modbus-communication-plc/79765/2 "2023-09-28T06:39:01Z")

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A couple of things to try:  
• Ping your plc from a computer on the network and see if it's talking  
• Go to the web interface and check the device connections

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<div class="post-metadata">

**Author:** ![ArvindKumar\_Muthukri](https://avatars.discourse-cdn.com/v4/letter/a/a5b964/32.png) [@ArvindKumar\_Muthukri](https://forum.inductiveautomation.com/u/ArvindKumar_Muthukri)\
**Post date:** [September 28, 2023, 6:42am UTC](https://forum.inductiveautomation.com/t/bad-tags-in-all-my-opc-modbus-communication-plc/79765/3 "2023-09-28T06:42:41Z")

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thanks for your replay.

im trying to connect my Schneider M580 PLC with IGNITION Scada software

in device connections it was showing connected and plc ping and connected.  
but tags are showing bad here im using Modbus TCP Communication protocol.

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<div class="post-metadata">

**Author:** ![justinedwards.jle](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/justinedwards.jle/32/37854_2.png) [@justinedwards.jle](https://forum.inductiveautomation.com/u/justinedwards.jle)\
**Post date:** [September 28, 2023, 6:53am UTC](https://forum.inductiveautomation.com/t/bad-tags-in-all-my-opc-modbus-communication-plc/79765/4 "2023-09-28T06:53:12Z")

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Perhaps you can find something in here that is useful:  
[https://forum.inductiveautomation.com/search?q=Schneider](https://forum.inductiveautomation.com/search?q=Schneider)

This one seem similar:  
[Link Tags from Schneider](https://forum.inductiveautomation.com/t/link-tags-from-schneider-plc-to-ignition-via-modbus-tcp-connection/31924)

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<div class="post-metadata">

**Author:** ![ArvindKumar\_Muthukri](https://avatars.discourse-cdn.com/v4/letter/a/a5b964/32.png) [@ArvindKumar\_Muthukri](https://forum.inductiveautomation.com/u/ArvindKumar_Muthukri)\
**Post date:** [September 28, 2023, 7:38am UTC](https://forum.inductiveautomation.com/t/bad-tags-in-all-my-opc-modbus-communication-plc/79765/5 "2023-09-28T07:38:26Z")

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Hi justinwards

Thank you so much for this its really a big help for me thanks thankyou so much, now im able to read and write data.