11 - Batch control technologies

Abstract

Before selecting an automation system, business goal are translated to systems strategy by doing analysis. Automation plan is developed to implement the systems strategy. The automation plan outlines the control system architecture including (1) hardware, (2) operating system and application software, (3) database system, and (4) communications. The programmable logic controllers (PLCs) are initially developed and used for discrete operations as a replacement for electro-mechanical relays. However, over the period of time with addition of process control and networking capabilities, PLCs have gained greater functionality. With advancement in user interfaces and supervisory control and data acquisition (SCADA) systems, PLCs have become more popular for sequence interlocking and integrating controllers. This chapter presents the usage of ISA S88 and ISA S95 standards for enterprise/control systems integration. The scope of ISA S88 Part 1 standard models is up to the process cells. Whereas in practice, the batch manufacturing systems have to address the issues of area management, site management, and the integration of batch manufacturing control s stems with the other business management systems. The ISA S95 Part 1 standard on enterprise/control system integration contains models for the functions of area and site management and the interfaces between the enterprise business systems and the manufacturing control systems.