# Siemens S7-1200 tag addressing issue(M/Q)

**URL:** <https://forum.inductiveautomation.com/t/siemens-s7-1200-tag-addressing-issue-m-q/12812>\
**Category:** Archived Topics\
**Created:** [March 19, 2017, 1:58pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-tag-addressing-issue-m-q/12812 "2017-03-19T13:58:20Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![SoulReaverDk](https://avatars.discourse-cdn.com/v4/letter/s/b19c9b/32.png) [@SoulReaverDk](https://forum.inductiveautomation.com/u/SoulReaverDk)\
**Post date:** [March 19, 2017, 1:58pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-tag-addressing-issue-m-q/12812/1 "2017-03-19T13:58:20Z")

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Ok, so I am still new to Ignition, but loving all the features and the interface is really nice to work with.  
I have a problem with addressing though. I have a simple on/off circuit in the PLC to toggle an output, but for some reason I can’t access a boolean tag, nor can I toggle the output directly. my syntax is [servername]M0.0 as an example. which doesn’t work. But when skipping the offset it works and “monitors” just fine.  
Same if I try Q0.0  
Am I writing the syntax wrong or does anyone have a suggestion to a solution?

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**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:** [March 19, 2017, 3:31pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-tag-addressing-issue-m-q/12812/2 "2017-03-19T15:31:20Z")

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For boolean tags you must add X:  
M0.0 → MX0.0  
Q0.0 → QX0.0  
I0.0 → IX0.0

[https://docs.inductiveautomation.com/display/DOC79/Siemens](https://docs.inductiveautomation.com/display/DOC79/Siemens) ![:thumb_right:](https://us1.discourse-cdn.com/inductiveautomation/original/1X/2026e28c0c425034352c1b75807edf956adc75f4.gif ":thumb\_right:")

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<div class="post-metadata">

**Author:** ![SoulReaverDk](https://avatars.discourse-cdn.com/v4/letter/s/b19c9b/32.png) [@SoulReaverDk](https://forum.inductiveautomation.com/u/SoulReaverDk)\
**Post date:** [March 19, 2017, 5:00pm UTC](https://forum.inductiveautomation.com/t/siemens-s7-1200-tag-addressing-issue-m-q/12812/3 "2017-03-19T17:00:29Z")

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Ah, cool. Didn’t see that at all 😒