# The Siemens s7-300 reads the value of type real abnormally

**URL:** <https://discourse.nodered.org/t/the-siemens-s7-300-reads-the-value-of-type-real-abnormally/90326>\
**Category:** Industrial\
**Created:** [22 August 2024 03:18 UTC](https://discourse.nodered.org/t/the-siemens-s7-300-reads-the-value-of-type-real-abnormally/90326 "2024-08-22T03:18:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Leon001](https://avatars.discourse-cdn.com/v4/letter/l/4af34b/32.png) [@Leon001](https://discourse.nodered.org/u/Leon001)\
**Post date:** [22 August 2024 03:18 UTC](https://discourse.nodered.org/t/the-siemens-s7-300-reads-the-value-of-type-real-abnormally/90326/1 "2024-08-22T03:18:02Z")

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In the PLC program, the value of DB40 and REAL0 is an "F", but the value I read out in node-red is 2.1019476964872256e-44. What is the cause of this and how should I solve it，is it related to byte bits?

 ![68b07706ee466e979358d60efdffdff](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/7/b/7b645cdce385c2754fbdd952f453d799e95dbfe6.png)

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**Author:** ![Leon001](https://avatars.discourse-cdn.com/v4/letter/l/4af34b/32.png) [@Leon001](https://discourse.nodered.org/u/Leon001)\
**Post date:** [22 August 2024 06:55 UTC](https://discourse.nodered.org/t/the-siemens-s7-300-reads-the-value-of-type-real-abnormally/90326/2 "2024-08-22T06:55:00Z")

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it has been solved

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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:** [5 September 2024 06:55 UTC](https://discourse.nodered.org/t/the-siemens-s7-300-reads-the-value-of-type-real-abnormally/90326/3 "2024-09-05T06:55:18Z")

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