# S7 PLC run/stop

**URL:** <https://discourse.nodered.org/t/s7-plc-run-stop/31132>\
**Category:** Industrial\
**Created:** [4 August 2020 11:55 UTC](https://discourse.nodered.org/t/s7-plc-run-stop/31132 "2020-08-04T11:55:25Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![zsoni96](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/zsoni96/32/26854_2.png) [@zsoni96](https://discourse.nodered.org/u/zsoni96)\
**Post date:** [4 August 2020 11:55 UTC](https://discourse.nodered.org/t/s7-plc-run-stop/31132/1 "2020-08-04T11:55:25Z")

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Hi everyone,

I'm currently working on a project involving PLCs ( i'm not an expert with them) and my question is is there any way to monitor if the PLC is in run or stop mode via nodred?

Im using the s7 node a siemes PLC

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**Author:** ![rromele](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/rromele/32/18431_2.png) [@rromele](https://discourse.nodered.org/u/rromele)\
**Post date:** [6 August 2020 15:16 UTC](https://discourse.nodered.org/t/s7-plc-run-stop/31132/2 "2020-08-06T15:16:01Z")

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Hi,

if you don't know the system area of ​​the plc, a very simple method is to create a polling, set a bit (merker) with the plc and reset it with NodeRed, or in the plc you create an incremental counter and with NodeRed you control it.

RRomele

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**Author:** ![Cristiano](https://avatars.discourse-cdn.com/v4/letter/c/b5e925/32.png) [@Cristiano](https://discourse.nodered.org/u/Cristiano)\
**Post date:** [23 August 2020 21:55 UTC](https://discourse.nodered.org/t/s7-plc-run-stop/31132/3 "2020-08-23T21:55:48Z")

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Hello,

Only way to do that its reading a DB, that Db should have status of the plc or the clock flag.

Ping to the IP doesnt work only if the plc in off(no power)

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [22 October 2020 21:55 UTC](https://discourse.nodered.org/t/s7-plc-run-stop/31132/4 "2020-10-22T21:55:49Z")

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Closed on 22 October 2020 21:55 UTC

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