Abstract
This paper deals with leveraging the IEC 61499 Function Blocks with the poST language. The poST language is a process-oriented extension of the IEC 61131-3 Structured Text (ST) language. The language targets specifying stateful behavior of PLC-based control software. The main purpose of our contribution is to provide coherence of the PLC source code with technological description of the plant operating procedure. The language combines the advantages of FSM-based programming with conventional syntax of the ST language and can be easily adopted by the community. The poST language assumes that a poST-program is a set of weakly connected concurrent processes. Each process is specified by a sequential set of states. The states are specified by a set of the ST constructs, extended by TIMEOUT operation, SET STATE operation, and START/STOP/check state operations to communicate with other processes. The paper describes the basics of the poST language, design constructs, and demonstrates usage of the poST language by developing control software for a wheel-chair elevator, and discusses the poST language over the control software implementation in Execution Control Chart.
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