Practical Fundamentals of E-Manufacturing, MES and Supply
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Transcript of Practical Fundamentals of E-Manufacturing, MES and Supply
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Practical Fundamentals of E-Manufacturing, MES & Supply Chain Management
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Systems Development
• Process Control system evolution• Accounting systems evolution• Manufacturing Execution systems• Supply Chain Management systems
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WHY• Increased reliability for– Quality– Yields
• Increased throughput• Increased safety• Reduced human-error • Increased accuracy of measurement instrumentation
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Evolutionary steps
• Manual Control• Pneumatic controls • Sequential Relay controls• Basic Automatic Process Control– Analog– Digital
• SCADA/DCS (& HMI)• Advanced Process Control
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Manual Control
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Pneumatic
• Compressed air• Multi-directional valves• Effectiveness very dependant on original logic
design and air supply• Maintenance/change process difficult• Specialized skills required
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Sequential relay
• Control relay has to be changed for changing production requirement
• Mechanical devices hence limited life span• Troubleshooting time consuming in case of
multiple relay systems• Require frequent maintenance• High replacement (in case of changed
requirement) and maintenance cost
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Basic Automatic Controller
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Process measurement instruments
• Temperature Measurements - Thermocouples, Filled-system thermometer Pressure Measurements – Liquid column, Diaphragm and Strain gauge type
• Flow Measurements – Vortex-shedding and Ultrasonic flow meters
• Level Measurements – Float-actuated devices and Magnetically coupled devices
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Indicating Instruments
• Analog –Analog type indicators fall into two main categories, moving pointer and moving scale. These are deflection type devices, powered directly, pneumatically or electrically, depending somewhat on their proximity to the process and the nature of the measurement
• Digital –Electronic digital display is as accurate as the information fed to them. In addition, it reduce chances of mechanical malfunction and human reading error
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Recording instruments
• Analog – Graphic analog recorders may be grouped in accordance with the type of chart used, circular chart and strip chart recorders
• Digital – It is not used extensively in the process industries unless a digital-computer control system is used
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Micro-processor control
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Programmable controller (PLC)
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Supervisory Control And Data Acquisition (SCADA)
• It is purely a software package that is positioned on top of hardware to which it is interfaced, via Programmable Logic Controllers (PLCs) to graphically display control status
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Distributed Control Systems (DCS)
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Advanced Process Control
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Supply Chain Management (SCM) • SCM encompasses every effort involved in producing and
delivering a final product or service, from the supplier’s supplier to the customer’s customer
• SCM includes managing supply and demand, sourcing raw materials and parts, manufacturing assembly, warehousing and inventory tracking, order entry and order management, distribution cress all channels, and delivery to the customer
• SCM address complex interdependencies due to its wide scope; in effect creating an “extended enterprise” that reaches beyond the factory door
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Internal Supply Chain
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