# Ignition Connect to Siemens OPC-UA

**URL:** <https://forum.inductiveautomation.com/t/ignition-connect-to-siemens-opc-ua/117688>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [November 1, 2026, 8:33am UTC](https://forum.inductiveautomation.com/t/ignition-connect-to-siemens-opc-ua/117688 "2026-11-01T08:33:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![yifeiliu08](https://avatars.discourse-cdn.com/v4/letter/y/bbe5ce/32.png) [@yifeiliu08](https://forum.inductiveautomation.com/u/yifeiliu08)\
**Post date:** [November 1, 2026, 8:33am UTC](https://forum.inductiveautomation.com/t/ignition-connect-to-siemens-opc-ua/117688/1 "2026-11-01T08:33:16Z")

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![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/d/3df15c4afcd550cb48cabe50c45cb2d684e2828b.png)

I have 1 siemens PLC, 1500 brand, it have the opc-ua inside, it is in the same IP with Server , as the upside picture i have success connect to it .

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/b/3b462bc8c3ee82e07dd8127211039905ea5f793b.png)

but in the real production line, the PLC IP is 172.16.127.2, i need use a NATR to switch it to the same ip as the ignition server,

this is when i configure the

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/7/b/7ba3dbbb7e22069f61561dbb2714c74b50e7b7b1.png)

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/5/357860e0c0233aa41c4401d2715e3fd1721a95e3.png)

most of the case it will shows

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/f/df9a0267083259865fdfb82cf8b083747edc006d.png)

but sometimes the step4 can show as the following picture

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/f/1/f18d1632a0c7c1892732190a60d3e954d27138f5.png)

it will failed at step6

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/1/a/1a689235f21d9de5de0b350bb4ae3814379ae18a.png)

but i use kepware to read

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/4/9/49cea2f98638b7aee3bf5e06306ba7ddea38d8f6.png)

it can browse the tags by means of OPC-UA

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/9/e/9eadfdc290b1f304eab68f8743217fe05a800d28.png)

TAG READ IS OK

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/5/5/5562ce65626586968e830831bf646d29b79273d0.png)

My question is , if the kepware is ok , that means the plc and network should be ok , but why ignition failed, how to set ignition successfully read the opc-ua tags?