# S7 node best practices

**URL:** <https://discourse.nodered.org/t/s7-node-best-practices/65312>\
**Category:** Industrial\
**Created:** [19 July 2022 10:28 UTC](https://discourse.nodered.org/t/s7-node-best-practices/65312 "2022-07-19T10:28:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![horsewithnoname](https://avatars.discourse-cdn.com/v4/letter/h/22d042/32.png) [@horsewithnoname](https://discourse.nodered.org/u/horsewithnoname)\
**Post date:** [19 July 2022 10:28 UTC](https://discourse.nodered.org/t/s7-node-best-practices/65312/1 "2022-07-19T10:28:04Z")

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Hi. I have 3 units of Siemens LOGO PLCs, 3 units of Data acquisition devices (communicating with PLCs via MODBUS-TCP) and 1 RPi 4 (commuicating with all the LOGO PLCs) in my network. Currently, I am using several _s7 in_ node in _Single variable_ mode in my nodered flow.

If I switch to one _s7 in_ node in _All variables_ mode, will I notice huge reduction in my network traffic? I notice network communication issues between data acquisition devices and plcs, and I would like to know, if it is efficient to switch to all variable mode.

Will communication happen in an optimized way in All variable mode compared to Single variable mode?

Thanks in advance.

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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:** [17 September 2022 10:28 UTC](https://discourse.nodered.org/t/s7-node-best-practices/65312/2 "2022-09-17T10:28:32Z")

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