# Problem reading tags from Siemens S7-1500 PLC **URL:** \ **Category:** Ignition\ **Created:** [November 3, 2020, 3:55pm UTC](https://forum.inductiveautomation.com/t/problem-reading-tags-from-siemens-s7-1500-plc/40244 "2020-11-03T15:55:59Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![luis.3.flores](https://avatars.discourse-cdn.com/v4/letter/l/8491ac/32.png) [@luis.3.flores](https://forum.inductiveautomation.com/u/luis.3.flores)\ **Post date:** [November 3, 2020, 3:55pm UTC](https://forum.inductiveautomation.com/t/problem-reading-tags-from-siemens-s7-1500-plc/40244/1 "2020-11-03T15:55:59Z")
I am having an issue trying to read the tags from a PLC S7-1500. I have access level set as “Full access (no protection” and the connection mechanism enabled for “permit access with PUT/GET communications from remote partner”. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/6/d677cccfd7ed63cdc4428f11565d1007fab86eaa.png) I am using the Ignition driver for S7-1500 over ethernet and the PLC is connected. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/d/dd2a019a33e055ec5f2197709b8cc065835cbfd2.png) On the designer I added an OPC tag named [s71500]DB66,STRING44.20 so I can read the following tag: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/b/5/b53256b99cd21a416b07eb977abc693c31ffecd4.png) I get error 8104 on the logs. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/b/a/baa4df427be5db7dd1de1b4298642b00d2565f5c.png) Any idea what is wrong ? ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [November 3, 2020, 3:57pm UTC](https://forum.inductiveautomation.com/t/problem-reading-tags-from-siemens-s7-1500-plc/40244/2 "2020-11-03T15:57:29Z")
Have you disabled optimized access for the data block(s) you are trying to read? ---
**Author:** ![luis.3.flores](https://avatars.discourse-cdn.com/v4/letter/l/8491ac/32.png) [@luis.3.flores](https://forum.inductiveautomation.com/u/luis.3.flores)\ **Post date:** [November 3, 2020, 3:58pm UTC](https://forum.inductiveautomation.com/t/problem-reading-tags-from-siemens-s7-1500-plc/40244/3 "2020-11-03T15:58:12Z")
Yes. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/2/1/2128046faafda51a12ae8f614468322524810c5c.png) ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [November 3, 2020, 4:07pm UTC](https://forum.inductiveautomation.com/t/problem-reading-tags-from-siemens-s7-1500-plc/40244/4 "2020-11-03T16:07:07Z")
Hmm. No further idea. @chi or @zxcslo are the go-to guys for Siemens. ps. Start new topics in the future. Necromancy is not always noticed by those who might be able to help. ---
**Author:** ![zxcslo](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/zxcslo/32/61610_2.png) [@zxcslo](https://forum.inductiveautomation.com/u/zxcslo)\ **Post date:** [November 3, 2020, 5:06pm UTC](https://forum.inductiveautomation.com/t/problem-reading-tags-from-siemens-s7-1500-plc/40244/5 "2020-11-03T17:06:50Z")
Well… the error 8104 means that access to the address is not allowed. So there must be something with the “Permit access with PUT/GET…” in the HW configuration of the PLC. Can you try to compile the PLC program again and download it to the PLC? Is this (STRING) the only tag you can’t read? ---
**Author:** ![luis.3.flores](https://avatars.discourse-cdn.com/v4/letter/l/8491ac/32.png) [@luis.3.flores](https://forum.inductiveautomation.com/u/luis.3.flores)\ **Post date:** [November 3, 2020, 5:18pm UTC](https://forum.inductiveautomation.com/t/problem-reading-tags-from-siemens-s7-1500-plc/40244/6 "2020-11-03T17:18:46Z")
I cannot read any tag at all. I will try to compile and download it again. ---
**Author:** ![luis.3.flores](https://avatars.discourse-cdn.com/v4/letter/l/8491ac/32.png) [@luis.3.flores](https://forum.inductiveautomation.com/u/luis.3.flores)\ **Post date:** [November 3, 2020, 5:44pm UTC](https://forum.inductiveautomation.com/t/problem-reading-tags-from-siemens-s7-1500-plc/40244/7 "2020-11-03T17:44:56Z")
I compiled the hardware configuration again and downloaded and it is working now! Thanks a lot!