CDL-PLC translator

General description

cdl-plc translates control sequences in the Control Description Language (CDL) to the IEC 61131-10 XML exchange format. The general aim of the cdl-plc translator is to transfer control sequences which were developed in the Modelica-based CDL on Programmable Logic Controllers (PLCs) standardized in IEC 61131. The IEC 61131-10 XML is an existing industry standard for the exchange of control sequences expressed in the languages according to IEC 61131-3.

CDL-support

The translator currently only supports control sequences including the following selected CDL blocks:

• Conversions.BooleanToInteger
• Conversions.BooleanToReal
• Logical.And
• Logical.Not
• Reals.Add
• Reals.Greater
• Reals.Hysteresis
• Reals.Limiter
• Reals.Line
• Reals.MovingAverage
• Reals.Multiply
• Reals.MultiplyByParameter
• Reals.Min
• Reals.PID
• Reals.Sources.Constant
• Reals.Subtract
• Reals.Switch.Constant

The aim of this version is to demonstrate the general feasability of the translation from CXF / .jsonld in the 61131-10 XML, including the creation of the XML structure, the connection of inputs / outputs or the handling of parameters. Further developments are required to cover the full scope of CDL.

How to use the translator

1. Create a CXF representation of your CDL control sequence in .jsonld using the modelica-json parser.
2. Specify the path of the .jsonld in cdl_plc.py and run the script. The output will be stored in the folder IEC61131-10XML.
3. Import the IEC 61131-10 XML in a PLC IDE (see below for compatibility).

Compatibility

• The translator is compatible with CXF representations in .jsonld created with the modelica-json translator release 1.2.0.
• The IEC 61131-10 XML import is tested with the PLC ICE Beremiz 1.4-rc1.

Useful links

• Modelica-json GitHub page
• Beremiz GitHub page

References

• International Electrotechnical Commission, 2019. Programmable controllers. Part 10: PLC open XML exchange format.