Modification of the CEMEX Cement Plant Control System

This article describes implementation of control system replacement in Cemex Hrvatska d.d. cement plants based on the application of good engineering practice recognized in the cycles of investment in the control systems for the period 2000 - 2015 and implementation of project control standards. The organization is integrated into the ISO 9001 quality system in the form of procedures and operating instructions. Most of the Cemex cement plant's technological processes were built from 1968 till 1979, with associated control systems. In 1968, the Sv.Kajo cement plant, cement and clinker production control technology refers to relays from the central control room with buttons and switches, and visualization of the process through the light indication on graphic panel of process. In 1979, the cement plant Sv.Juraj, the cement and clinker production control technology is managed by TTL transistor logic cards from the central control room with buttons and switches, and visualization of the process through the light indication on graphic panel of process. During the last 15 years, parts of the manufacturing process in both factories have been modernized, which resulted in introduction of PLC / SCADA technology for the control of different manufacturers and design solutions. By adopting the experience of maintaining, modifying and detecting failures on these systems and having in mind the upcoming introduction of the control systems which had to replaced, it was decided to create internal standards and procedures to unify solutions and equipment.