# IGNITION 8 OPC SERVER PROBLEM with Siemens S71200 PLC **URL:** \ **Category:** Ignition Early Access\ **Created:** [October 3, 2019, 10:15am UTC](https://forum.inductiveautomation.com/t/ignition-8-opc-server-problem-with-siemens-s71200-plc/28775 "2019-10-03T10:15:11Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![eduardo.ojalvo](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/eduardo.ojalvo/32/14356_2.png) [@eduardo.ojalvo](https://forum.inductiveautomation.com/u/eduardo.ojalvo)\ **Post date:** [October 3, 2019, 10:15am UTC](https://forum.inductiveautomation.com/t/ignition-8-opc-server-problem-with-siemens-s71200-plc/28775/1 "2019-10-03T10:15:11Z")
Hi everybody. I don´t know why but i can not connect to a siemens 1200 (1214C dc/DC/DC) PLC with Ignition 8.0.3, 8.0.4 and 8.0.5 nightly version with opc. The device appears connected in my gateway, but when i try to add a tag in the designer it does´nt work. For example, I´ve a DB not optimized with booleans and integers values. I write like next: [DEVICE\_NAME]DB102,x0.0 for boolean access [DEVICE\_NAME]DB102,I2 for integer access in both cases i have an uncertain value and can´t get the good quality value for tags. I ´ve tried to put a prefix value ns=1;s=[DEVICE\_NAME]DB102,x0.0 and was not successfully. I must say that with 7.9 version it worked all right. Thank you very much. ---
**Author:** ![eduardo.ojalvo](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/eduardo.ojalvo/32/14356_2.png) [@eduardo.ojalvo](https://forum.inductiveautomation.com/u/eduardo.ojalvo)\ **Post date:** [October 4, 2019, 11:37am UTC](https://forum.inductiveautomation.com/t/ignition-8-opc-server-problem-with-siemens-s71200-plc/28775/2 "2019-10-04T11:37:07Z")
Sorry I have tested with another plc and everything it´s working. May be the PLC hardware is wrong or something about firmware, don´t know. Thank you for your attention.