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1. Project architecture
A project is made up of configurations. A configuration is a hardware platform comprising one or more resources. A resource represents a virtual machine. A resource is divided into several programming units called POUs (program organization units). The POUs of a resource are organized in a hierarchical architecture. POUs can be described using the graphical or textual languages SFC, FC, ST, IL, FBD or LD. POUs can be programs, functions or function blocks.
1.1 Programs
A program is a logical unit of programming that describes operations between process variables. Programs describe sequential or cyclic operations. Cyclic programs are executed at each target cycle. Sequential programs behave dynamically.
Programs are organized in a hierarchical...
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Project architecture
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Standards
International Electrotechnical Commission IEC
- Automates programmables Partie-3 : Langages de programmation - CEI 61131-3 - 01-03
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