# Not optimized Address block error with S7 1500

**URL:** <https://forum.inductiveautomation.com/t/not-optimized-address-block-error-with-s7-1500/27280>\
**Category:** Ignition\
**Created:** [August 8, 2019, 5:15pm UTC](https://forum.inductiveautomation.com/t/not-optimized-address-block-error-with-s7-1500/27280 "2019-08-08T17:15:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![cristiano.paiola](https://avatars.discourse-cdn.com/v4/letter/c/c77e96/32.png) [@cristiano.paiola](https://forum.inductiveautomation.com/u/cristiano.paiola)\
**Post date:** [August 8, 2019, 5:15pm UTC](https://forum.inductiveautomation.com/t/not-optimized-address-block-error-with-s7-1500/27280/1 "2019-08-08T17:15:45Z")

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Hello, I had this error in Ignition (see the attached picture)

 ![ErroriScritturaConPlc2](https://us1.discourse-cdn.com/inductiveautomation/original/2X/1/18e81a113a2a1feccd5c4806121947dfc14e6bfd.png)

This error occurs very rarely but when it starts a gateway reboot is necessary. There are 4 connections to Siemens S71500 and one S7 300, here below the models

CPU 1515F-2 PN 6ES7 515-2FM01-0AB0 Firmware v2.5  
CPU 1515F-2 PN 6ES7 515-2FM01-0AB0 Firmware v2.1  
CPU 1515F-2 PN 6ES7 515-2FM01-0AB0 Firmware v2.5  
CPU 1515F-2 PN 6ES7 515-2FM01-0AB0 Firmware v2.5  
S7-300

The ignition version is 7.9.8 (b2018060714), installed on a Windows Server 2016 Essential version 1607, build 14393.2999. The JVM is a JDK 1.8 update 181.

Can you please tell me how I can avoid this happening ?

Regards

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**Author:** ![MoisesZV](https://avatars.discourse-cdn.com/v4/letter/m/e68b1a/32.png) [@MoisesZV](https://forum.inductiveautomation.com/u/MoisesZV)\
**Post date:** [December 6, 2019, 4:04am UTC](https://forum.inductiveautomation.com/t/not-optimized-address-block-error-with-s7-1500/27280/2 "2019-12-06T04:04:17Z")

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Hi Cristiano, Do you resolve your problem? I have the same error with a S7400 PLC.