Differences

This shows you the differences between two versions of the page.

--- en:sw:01-mervis:multiple-history-intervals-hidden [2020/06/01 09:00] – jan_kozak
+++ en:sw:01-mervis:multiple-history-intervals-hidden [2025/07/09 13:45] (current) – added warning about history and ram ofojt
@@ Line 1: / Line 1: @@
-~~NOTOC~~ /*
+~~NOTOC~~
 ====== Advanced history log configuration ======
-*/
+<WRAP group>
-====== Multiple history log intervals ======
+<WRAP half column 81%>
-This tutorial describes how to store values into a PLC in different save periods. By doing so you can save a lot of memory space reserved for data, increasing the PLC’s backup storage time. This feature is useful especially for backing up a large amount of data. The solution is also suitable for PLCs connected to the Mervis DB through a connection billed per amount of data used.
+This guide demonstrates how to log historic values in [[#multiple_logging_intervals|different intervals]] and also how to set up and use the [[#asynchronous_history_logging|asynchronous history logging]] into a database. By using this feature you can considerably decrease the memory space needed for history logs, increasing the duration of PLCs backup - this is useful especially in case of backing up a large amount of data (variables). The solution is also a good choice for projects in which the PLC is connected to Mervis DB via connections charged by used data volume.
+</WRAP>
-/*
+<WRAP half column 15%>
-This guide demonstrates how to log historic values in [[#vice_intervalu_pro_zapis_do_historie|different intervals]] and also how to set up and use the [[#asynchronni_zapis_do_historie|asynchronous history logging]] into a database. By using this feature you can considerably decrease the memory space needed for history logs, increasing the duration of PLCs backup - this is useful especially in case of backing up a large amount of data (variables). The solution is also a good choice for projects in which the PLC is connected to Mervis DB via connections charged by used data volume.
+;;#
-*/
+<html><span class="dev-tag dev-patron">Patron</span></html> \\
+<html><span class="dev-tag dev-neuron">Neuron</span></html> \\
+<html><span class="dev-tag dev-gate">Gate</span></html> \\
+<html><span class="dev-tag dev-unipi11">Unipi&nbsp1.1</span></html> \\
+<html><span class="dev-tag dev-axon">Axon</span></html>
+;;#
+</WRAP>
+</WRAP>
 Generally speaking, we recommend setting the save periods as long as possible to save up the PLC’s memory and decrease the load on both your network and servers.
@@ Line 24: / Line 31: @@
 {{:en:sw:01-mervis:01_multiple-history-intervals_en.png?direct|}}
-/*
+{{page>en:sw:01-mervis:store-history-in-ram-hidden}}
-===== Multiple logging intervals for history log =====
-*/
+===== Multiple logging intervals =====
 Right-click on **History**. A menu will open - click on **Add New History**.
@@ Line 47: / Line 54: @@
 If you did everything correctly, you now have 5 different history log save periods.
-<WRAP center round important 60%>
+<WRAP group center round box 95%>
+{{ :files:img_warning-line_b.png?nolink |}}
+<WRAP half column 13%>
+{{ :en:hw:09_safety-instructions_pseudo-ISO-7010-attention.png?nolink |(!)}}
+</WRAP>
+<WRAP half column 83%>
+**Attention:** \\
 Do not mistake these **save period** settings with those for configuring the **communication period** for storing into the Mervis DB.
+</WRAP>
 </WRAP>
 You can now import the required variables into the **History log**. You can change the save periods later with the already imported variables.
-/*
 ===== Asynchronous history logging =====
 Right-click on **History** and in the menu select **Add New History**. If you already have a history log created, click on it.
@@ Line 61: / Line 74: @@
 <html><span class="kbBlueText">The first item is for enabling the logging</span></html>
- ''FALSE'', nelze uložit záznam
   * If set to ''FALSE'', the logging is disabled
   * If set to ''TRUE'', the logging is enablůed
-<html><span class="kbBlueText">Druhá položka slouží ke spuštění zápisu hodnot:</span></html>
+<html><span class="kbBlueText">The second item serves for starting the history log</span></html>
   * If set to ''FALSE'' - logging is disabled
   * When set to ''TRUE'', a log will be saved once a rising edge is detected (if the enable item is also set to TRUE)
@@ Line 71: / Line 83: @@
 {{:cs:sw:01-mervis:07_multiple-history-intervals_cz.png?direct|}}
-<WRAP center round info 85%>
+<WRAP group center round box 95%>
-A typical application is a temperature sensor (ie. an outdoor thermometer), for which we do not need to store its exact value. Instead, we can log the temperature value only if it changes by more than ± 1°C compared to the last logged value. By doing so, we can ensure only relevant data will be logged.
+{{ :files:img_warning-line_b.png?nolink |}}
+<WRAP half column 13%>
+{{ :en:hw:08_safety-instructions_pseudo-ISO-7010-info.png?nolink |(!)}}
+</WRAP>
+<WRAP half column 83%>
+**Note:** \\
+A typical application is a temperature sensor (ie. an outdoor thermometer), for which we do not need to store its exact value. Instead, we can log the temperature value only if it changes by more than ±1 °C compared to the last logged value. By doing so, we can ensure only relevant data will be logged.
+</WRAP>
 </WRAP>
-*/