- •1. TABLE OF CONTENTS
- •2. COMPUTER HARDWARE
- •3. A BRIEF OVERVIEW OF COMPUTER HARDWARE
- •3.1 BASIC COMPONENTS
- •3.1.1 The components of a computer are,
- •3.1.2 Some I/O Devices
- •3.2 AN EXAMPLE OF A COMPUTER IN MANUFACTURING
- •3.3 COMMERCIAL COMPUTERS
- •3.3.1 Mainframes
- •3.3.2 Super Computers
- •3.3.3 Workstations
- •3.3.4 Personal Computers
- •3.3.5 Dedicated Computers
- •3.3.6 Single Board Computers
- •3.4 ARCHITECTURE AND BUSES
- •3.4.1 Clock Speed and the Buses
- •3.5 SOFTWARE
- •4. COMPUTER INTERFACING
- •4.1 DIGITAL SIGNALS
- •4.2 ANALOG SIGNALS
- •4.2.1 Analog to Digital Conversion
- •4.2.1.1 - Flash A/D Converter
- •4.2.2 Digital to Analog Conversion
- •4.3 TIMING
- •4.3.1 Interrupts
- •4.3.2 Clocks and Timers
- •4.3.3 Watch Dog Timers
- •4.3.4 Polling
- •4.4 DISPLAYS
- •5. COMPUTER INTERFACE BOARDS
- •5.1 OVERVIEW
- •5.1.1 Types
- •5.2 REGISTER LEVEL PROGRAMMING
- •5.3 EXAMPLES
- •6. COMPUTER CONTROL OF PROCESSES
- •6.1 TEMPERTURE CONTROL
- •6.2 BATCH PROCESSING
- •6.3 COMPUTER PROCESS MONITORING
- •6.4 IMPLEMENTING A COMPUTER CONTROL SYSTEM
- •6.4.1 SCADA
- •6.5 PRACTICE PROBLEMS
- •7. COMPUTER COMMUNICATIONS
- •7.1 COMPUTER COMMUNICATIONS CATEGORIES
- •7.2 THE HISTORY
- •7.3 SERIAL COMMUNICATIONS
- •7.6 GPIB/IEEE-488
- •7.7 PARALLEL COMMUNICATIONS
- •8. INTERFACING COMPUTERS FOR DATA TRANSFER
- •8.1 SERIAL DATA TRANSFER
- •8.2 PARALLEL DATA TRANSFER
- •8.2.1 GPIB Bus (IEEE-488)
- •9. COMPUTER NETWORKING
- •9.1 OSI NETWORK MODEL
- •9.1.1 Why Use A Network?
- •9.1.1.1 - Physical Layer
- •9.1.1.2 - Data Link Layer
- •9.1.1.3 - Network Layer
- •9.1.1.4 - Transport Layer
- •9.1.1.5 - Session Layer
- •9.1.1.6 - Presentation Layer
- •9.1.1.7 - Application Layer
- •9.2 OPEN SYSTEMS
- •9.3 NETWORKING HARDWARE
- •10. MANUFACTURING AUTOMATION PROTOCOL (MAP)
- •10.1 OVERVIEW
- •10.2 DETAILS
- •10.2.1 Physical Alternatives (Layer 1 OSI Model),
- •10.2.2 Data Link Layer (Layer 2 OSI Model),
- •10.2.3 Application Layer:
- •10.3 DETAILS FOR TOP
- •10.3.1 Application Layer:
- •10.5 MAP AND OTHER STANDARDS
- •10.6 AN EXAMPLE OF A MAP IMPLEMENTATION
- •10.7 ETHERNET
- •10.7.1 Internet
- •10.7.2 SLIP/PPP
- •10.8 DATA HIGHWAY+
- •10.9 REMOTE PLC I/O
- •10.10 DEVICENET
- •10.11 OTHER STUFF
- •10.12 Network Facts
- •11. DATABASE TECHNOLOGY
- •11.1 DISTRIBUTED DATABASE SYSTEMS
- •11.1.1 Relational database systems
- •11.1.2 Issues for distributed database systems
- •11.1.2.1 - Query processing
- •11.1.2.2 - Concurrency control
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-There must be an I/O interface between the processes and the control. The I/O interface passes all the information moving between the two parts of the total system.
-The control system must provide continuous control functions to regulate appropriate portions of the process.
-The control system must provide sequential control functions. A properly designed batch control system should make it easy to describe the sequence of operations and the checks that must take place.
-The control system must provide displays and interfaces which the operator can use to monitor and direct process activity.
•Additional functions found only in Digital control systems
-An advanced control system should allow the process to handle a range of products, and not just a single product. The use of recipes is a concise and convenient method to describe the process steps for each product.
-An advanced control system should provide a multiprogramming environment in which each specific task can be programmed in a simple stand-alone fashion. The system should also allow more than one unit in the plant to be controlled at the same time.
-An advanced control system should provide displays which are oriented toward the total process rather than toward individual parameters.
-An advanced control system should automatically detect and correct process upsets and equipment failures.
-An advanced control system should provide for device operations which reduce the complexity of the logic that the user must deal with. There are many mundane and repeated operations and error checking functions which must be done in manipulating valves, pumps, motors, fans, and so on which can best be handled in device packages which standardize such operations.
6.3 COMPUTER PROCESS MONITORING
•Process Data,
•can ensure dangerous situations are avoided
•variables such as temperature, pressures, forces, concentrations of chemicals, etc.
•Can help track process progress, and allow corrections
•Equipment Data,
•Data related to equipment
•Can avoid dangerous and costly operating conditions
•Product Data,
•Allows on line monitoring of process output,
•variables can be, quality, yield, production rate, etc.