# Modbus TCP?

**URL:** <https://forum.inductiveautomation.com/t/modbus-tcp/10009>\
**Category:** Ignition\
**Created:** [May 12, 2015, 8:20pm UTC](https://forum.inductiveautomation.com/t/modbus-tcp/10009 "2015-05-12T20:20:11Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![fivecents](https://avatars.discourse-cdn.com/v4/letter/f/d9b06d/32.png) [@fivecents](https://forum.inductiveautomation.com/u/fivecents)\
**Post date:** [May 12, 2015, 8:20pm UTC](https://forum.inductiveautomation.com/t/modbus-tcp/10009/1 "2015-05-12T20:20:11Z")

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Ignition version 7.6.4 with Yaskawa VFD CIMR-P7\_4030 with a CM090 ModbusTCP adaptor.  
Here is link to adaptor:  
[yaskawa.com.br/wp-content/up … TCP-IP.pdf](http://www.yaskawa.com.br/wp-content/uploads/2013/08/Manual_Ingl%C3%AAs_G7_Modbus-TCP-IP.pdf)

I am trying to read 2005h Output Frequency Monitor (U1-02) in ignition OPC-UA with no success.  
In ignition the connection state is -connected  
Is connected is selected  
port is 502  
but no success reading any live values.  
I read ignition manual linked here:  
[support.inductiveautomation.com … rview2.htm](https://support.inductiveautomation.com/usermanuals/ignition/index.html?overview2.htm)  
Can anyone point me in the right direction to try and get this to work?

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**Author:** ![AlThePal](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/althepal/32/3603_2.png) [@AlThePal](https://forum.inductiveautomation.com/u/AlThePal)\
**Post date:** [May 14, 2015, 12:31pm UTC](https://forum.inductiveautomation.com/t/modbus-tcp/10009/2 "2015-05-14T12:31:43Z")

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Often the issue is with entering the address in the correct format in Ignition. If you post an example we can see whether it looks valid.

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<div class="post-metadata">

**Author:** ![fivecents](https://avatars.discourse-cdn.com/v4/letter/f/d9b06d/32.png) [@fivecents](https://forum.inductiveautomation.com/u/fivecents)\
**Post date:** [July 16, 2024, 7:12pm UTC](https://forum.inductiveautomation.com/t/modbus-tcp/10009/3 "2024-07-16T19:12:30Z")

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Since original posting updated VFD and modbus communication card.  
Here is manual path:  
[modbusDevice]unitId.DecimalValueOfHex.bit

Here is example for reading vfd current (no bit required):  
[myIgnitionDeviceName]0.HR8198