# Siemens S7-1500 FC addressing **URL:** \ **Category:** Ignition\ **Tags:** ignition81\ **Created:** [October 25, 2021, 2:39pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1500-fc-addressing/52301 "2021-10-25T14:39:13Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![mjohnson0238](https://avatars.discourse-cdn.com/v4/letter/m/4bbf92/32.png) [@mjohnson0238](https://forum.inductiveautomation.com/u/mjohnson0238)\ **Post date:** [October 25, 2021, 2:39pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1500-fc-addressing/52301/1 "2021-10-25T14:39:13Z")
Good day, Ive looked in the use manual and did not see and addressing to monitor an FC from Siemens TIA 15. The bit is a boolean value so I thought the address would have been like this: [M08 3B Conveyor]FC5,X5.2 . Can it read only values in a DB? ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [October 25, 2021, 2:48pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1500-fc-addressing/52301/2 "2021-10-25T14:48:34Z")
> [@mjohnson0238](#): > > Can it read only values in a DB? Yes, just DB and the other areas in the manual. ---
**Author:** ![mjohnson0238](https://avatars.discourse-cdn.com/v4/letter/m/4bbf92/32.png) [@mjohnson0238](https://forum.inductiveautomation.com/u/mjohnson0238)\ **Post date:** [October 25, 2021, 2:49pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1500-fc-addressing/52301/3 "2021-10-25T14:49:13Z")
Ok thank you for the assistance, i will just make a DB that references that FC bit. ---
**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:** [October 25, 2021, 3:23pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1500-fc-addressing/52301/4 "2021-10-25T15:23:26Z")
FCs don’t have their own values (except local variables which are not accessible outside FCs). Everything that is used in FC, comes from elsewhere. You said a bit from the FC: that bit is probably some merker (M5.2) which you can read directly like: [M08 3B Conveyor]MX5.2 Please, show us a snippet or screenshot of your PLC code from that FC that you want to read, so we can understand better, what you want/need. ---
**Author:** ![mjohnson0238](https://avatars.discourse-cdn.com/v4/letter/m/4bbf92/32.png) [@mjohnson0238](https://forum.inductiveautomation.com/u/mjohnson0238)\ **Post date:** [October 25, 2021, 3:27pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1500-fc-addressing/52301/5 "2021-10-25T15:27:27Z")
I wanted to read this value: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/7/d/7de617ea21ba6868add4331a4a2e441695169d91.png) Currently what I did was use a DB and just added that boolean value as a XIC to turn on a boolean in the DB. I have it reading that way, but if there is another way I would love to learn it, Thanks ---
**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:** [October 25, 2021, 3:55pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1500-fc-addressing/52301/6 "2021-10-25T15:55:08Z")
Like I wrote: [yourDevice]MXx.x In your case: [M08 3B Conveyor]MX5.2 ---
**Author:** ![mjohnson0238](https://avatars.discourse-cdn.com/v4/letter/m/4bbf92/32.png) [@mjohnson0238](https://forum.inductiveautomation.com/u/mjohnson0238)\ **Post date:** [October 25, 2021, 4:02pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1500-fc-addressing/52301/7 "2021-10-25T16:02:26Z")
10 4, thanks for your expertise.