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4.1 P&ID Input The instrumentation representation on P&ID's must include proper loop representation, tagging, and measurement and control device symbols. 4.2 Continuous Control Loops Design of the control scheme for all continuous control loops is often completed on the P&ID diagram. It can also be accomplished using SAMA symbols for control algorithms. Control loops must be completely defined prior to developing configuration software. 4.3 Discrete Logic Design Discrete logic can be described in a structured narrative of process operation or on a diagram using symbols for logic gates. A detailed design of logic must be completed before programming can be finalized. 4.4 Operator Interface Design of CRT based operator interface using process graphics, alarm screens, control faceplates, trends, and text screens. The interface design is prepared in conjunction with control logic to define how the operator interacts with the process to accomplish desired control functions. 4.5 Process Control Operational Description The operational description defines how the control system functions and the operator interface for various modes of process operation. It is derived from the logic and operator interface design. 4.6 I/O Definition Definition of the I/O tagging, service description, location, range values and alarm limits. The I/O definition forms the primary database for configuration of the control system. 4.7 PLC Software and Documentation PLC code using a software development package with complete documentation capabilities. The software is based on the logic and control loop design. Also includes operator interface code for CRT displays. 4.8 DCS Software and Documentation Generation of DCS configuration by utilizing vendor forms or development system. Normally consists of an I/O point database and software connection of various control function blocks. Also includes operator interface code for CRT displays. These are usually graphics and faceplates supplied as part of the DCS system. 4.9 System Software/Hardware Testing Simulation of the process operation to test the software functions. Testing is done at the system fabrication location and can consist of test software and/or hardwired I/O devices. Testing of all system hardware components is also included. Table of Contents - Chapter 1 - Chapter 2 - Chapter 3 - Chapter 4 - Chapter 5 |