Linux runtime: overrun detection for real-time timers and for plc execution.
If real-time timer wakes-up PLC thread too late (10% over period), then
warning is logged.
If PLC code (IO retreive, execution, IO publish) takes longer than requested
PLC execution cycle, then warning is logged, and CPU hoogging is mitigated
by delaying next PLC execution a few cylces more until having at least
1ms minimal idle time.
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<content>
<xhtml:p><![CDATA[Always consume some energy]]></xhtml:p>
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<content>
<xhtml:p><![CDATA[Simple sensor simulation]]></xhtml:p>
</content>
</comment>
<comment localId="29" height="67" width="229">
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<content>
<xhtml:p><![CDATA[Climate control]]></xhtml:p>
</content>
</comment>
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<content>
<xhtml:p><![CDATA[This examples shows how to work with BACnet extension.
Extensions requires native BACnet stack to be installed nearby Beremiz.
Following directory structure is expected:
<Parent directory>
"beremiz"
"BACnet"
If library is installed elsewhere, then place corresponding paths
in CFLAGS/LDFLAGS in project settings.
For GNU/Linux to install BACnet library in parent directory run following commands:
$ svn checkout https://svn.code.sf.net/p/bacnet/code/trunk/bacnet-stack/ BACnet
$ cd BACnet
$ make
After that BACnet extension is ready to be used in Beremiz projects.
BACnet stack implementation contains a lot of test tools. They could be useful during
debugging and BACnet investigation. See "BACnet/bin/readme.txt" for more information about them.]]></xhtml:p>
</content>
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<interface>
<outputVars>
<variable name="Out">
<type>
<REAL/>
</type>
</variable>
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<inputVars>
<variable name="MinVal">
<type>
<REAL/>
</type>
</variable>
<variable name="MaxVal">
<type>
<REAL/>
</type>
</variable>
<variable name="PeriodSeconds">
<type>
<INT/>
</type>
</variable>
</inputVars>
<localVars>
<variable name="TON0">
<type>
<derived name="TON"/>
</type>
</variable>
<variable name="seconds">
<type>
<INT/>
</type>
</variable>
<variable name="BaseVal">
<type>
<REAL/>
</type>
</variable>
<variable name="VarVal">
<type>
<REAL/>
</type>
</variable>
</localVars>
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<ST>
<xhtml:p><![CDATA[(* pseudo-random variations *)
TON0(IN := TRUE, PT := T#3120s);
IF TON0.Q THEN
TON0(IN := FALSE);
END_IF;
seconds := TIME_TO_INT(TON0.ET);
BaseVal := (MaxVal + MinVal)/2.0;
VarVal := (MaxVal-MinVal)*INT_TO_REAL((seconds MOD PeriodSeconds) - (PeriodSeconds/2))/INT_TO_REAL(PeriodSeconds);
Out := BaseVal + VarVal;]]></xhtml:p>
</ST>
</body>
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<configurations>
<configuration name="config">
<resource name="resource1">
<task name="task0" priority="0" interval="T#20ms">
<pouInstance name="instance0" typeName="program0"/>
</task>
</resource>
</configuration>
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