# Read Once Setup of S7 node

**URL:** <https://discourse.nodered.org/t/read-once-setup-of-s7-node/86802>\
**Category:** Industrial\
**Created:** [27 March 2024 11:07 UTC](https://discourse.nodered.org/t/read-once-setup-of-s7-node/86802 "2024-03-27T11:07:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dk1507](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dk1507/32/89667_2.png) [@dk1507](https://discourse.nodered.org/u/dk1507)\
**Post date:** [27 March 2024 11:07 UTC](https://discourse.nodered.org/t/read-once-setup-of-s7-node/86802/1 "2024-03-27T11:07:03Z")

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Hi, Guys,  
I am new to node-red need help on the usage of node-red-contrib-s7. What I am trying to do is with a trigger or event, the node will read a variable from a PLC endpoint(setup via S7\_Control node). Whatever I setup it with Trigger Read or Cycle, what I got from the Debug node connected to the S7\_In node works periodically...

How I can just read once when triggered?

Thanks,

David

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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:** [26 May 2024 11:07 UTC](https://discourse.nodered.org/t/read-once-setup-of-s7-node/86802/2 "2024-05-26T11:07:31Z")

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