Technical documentation for PLC Bernecker-Rainer ( http://www.br-automation.com )
Technical documentation for Siemens PLC Simatic ( http://www.siemens.com )
Stenerson J.: Fundamentals of Programmable Logic Controllers, Sensors and Communications. Prentice Hall, 1999.
Lewis R. W.: Programming Industrial Control Systems Using IEC 1131-3. The Institution of Electrical Engineers, London, UK, 1998.
Industrial standard IEC 61131-3.
Boyer S. A.: SCADA - Supervisory control and data acquisition. ISA, 1999. ISBN 1-55617-660-0.