Kuhnke Electronics Instruction Manual
Kuhnke Electronics Instruction Manual
Kuhnke Electronics Instruction Manual
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4.8 Extraremanent Data<br />
4.8.1 Remanence Compliant to IEC 11631-3<br />
117<br />
Remanent Data<br />
Retain variables are re-initialised when a program has<br />
been transferred (i.e. they are set =0 unless another initial<br />
value has been defined).<br />
(Since all data references in the newly loaded program<br />
may have changed, it would be the safest approach to<br />
simply clear all Retain data.)<br />
IEC 11631-3 rules that persistent data are re-initialised<br />
following a reset.<br />
If Retain and Persistent data are combined, a reset (cold)<br />
or (origin) re-initialises the data.<br />
This approach allows important operative data or recipes<br />
to be safely stored at the commissioning and startup<br />
stage.<br />
The CoDeSys runtime system of PCControl 645-12M-PCI<br />
and the Ventura SlotPLC does not support variable<br />
property "PERSISTENT".<br />
Property of variables "Retain" is not available for<br />
variables with fixed addresses (%IB, %QB, %MB …)
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