Modeling, Specification and Construction of PLC-programs
A new approach to construction of reliable discrete PLC-programs with timers — programming based on specification and verification — is proposed. Timers are modelled in a discrete way. For the specification of a program behavior we use the linear-time temporal logic LTL. Programming is carried out i...
Main Authors: | , |
---|---|
Format: | Article |
Language: | English |
Published: |
Yaroslavl State University
2013-04-01
|
Series: | Modelirovanie i Analiz Informacionnyh Sistem |
Subjects: | |
Online Access: | https://www.mais-journal.ru/jour/article/view/209 |
Summary: | A new approach to construction of reliable discrete PLC-programs with timers — programming based on specification and verification — is proposed. Timers are modelled in a discrete way. For the specification of a program behavior we use the linear-time temporal logic LTL. Programming is carried out in the ST-language according to a LTLspecification. A new approach to programming of PLC is shown by an example. The proposed programming approach provides an ability of a correctness analysis of PLC-programs using the model checking method. The programming requires fulfillment of the following two conditions: 1) a value of each variable should be changed not more than once per one full PLC-program implementation (per one full working cycle of PLC); 2) a value of each variable should only be changed in one place of a PLC-program. Under the proposed approach the change of the value of each program variable is described by a pair of LTL-formulas. The first LTL-formula describes situations that increase the value of the corresponding variable, the second LTL-formula specifies conditions leading to a decrease of the variable value. The LTL-formulas (used for specification of the corresponding variable behavior) are constructive in the sense that they construct the PLC-program, which satisfies temporal properties expressed by these formulas. Thus, the programming of PLC is reduced to the construction of LTL-specification of the behavior of each program variable. |
---|---|
ISSN: | 1818-1015 2313-5417 |