national instruments india webcast
DESCRIPTION
National Instruments 'Webcast Wednesday' presented by : Bandan Jot SIngh , Applications Engineer , National Instruments India For more information on Webcast Wednesday's: http://digital.ni.com/worldwide/india.nsf/web/all/8A6F4A7271EAC4AF86257661006318F9?OpenDocument&node=163960_usTRANSCRIPT
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Meet your Presenter
Bandan Jot Singh
Applications Engineer, NI India
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Case Study
Using NI-LabVIEW Real-time and PXI Technology To Automate Gauge-Control In
Cold Rolling Mills
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• Alternate Control System Platforms
• Problem Statement
• Formulation of Closed-Loop Control System
• Implementation Using LabVIEW RealTime and NI Hardware
• Leverage Achieved Using NI Equipments
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Agenda
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Control System Platforms• Various Control System Platforms Available
• PLC: Programmed in Ladder Logic (Operation Specific)
• DCS: Collection of various PLC’s and RTU’s (Dedicated Systems)
• Applications using frequently changing control logic may not be efficient on such platforms because development time is more.
• Multiple hardware synchronization not supported
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• Useful for ferrous and non-ferrous metal industries
• Applications that require Real-Time Monitoring
• Control Systems that require high-precision monitoring and a short response time
To develop a PXI based Gauge monitoring and control system using LabVIEW RT and National Instruments
Data-Acquisition Systems
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Gauge-Control In Cold Rolling Mills
• Position
• InitialThickness
• Rotating Speed
• Pressure Applied
Inputs
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Sensors Used
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Closed Loop Control System
• Process: Hydraulic Pump (to control position)
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Implementation through NI Controller running LabVIEW RealTime
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Choosing the Right Modules for the PXI System
• NI PXI – 6040E• 500 kS/s (1-Channel), 250 kS/s (Multichannel), 12-Bit, 16-Analog-
Input Multifunction DAQ
• Assimilation of Thickness and Pressure Data
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Module for Measuring Speed of the Metal Strip
• NI PXI – 6602 Counter card• 8-channel, 32-bit up/down counter/timer module
• 80 MHz maximum source frequency
• 3 simultaneous high-speed DMA Transfer Capability
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Module to Control Servo Valves
• NI PXI – 6711• High-Speed Analog Output -- 12-Bit, 1 MS/s per Channel
• Digital triggering and external clocking
• 2 up/down counter/timers, 24-bit resolution
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Final System Setup
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Implementation of Control System Using LabVIEW Real-Time Development Environment
• The virtual instrument can be developed using PID Control Toolkit and then targeted to the PXI controller running on LabVIEW Real time.
• Specialized for Time-critical data acquisition and control applications
• Download to a dedicated target for increased reliability.
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Benefits of Using LabVIEW RT and NI DAQ Equipments
• The benefits of using LabVIEW and NI DAQ equipments compared to the traditional instruments and PLC :
– The development time for putting the whole system came down by a factor of 1/6.
– Increased flexibility in redesigning the control mechanism as per the requirements of different materials fed to the system.
– Enhanced quality in output because of reduction in response times. In a typical PLC based system the control loop rate is 100 to 500 milliseconds but in NI PXI based system, this is reduced to 10 ms.
– The capability of all the hardware to synchronize on the PXI RTSI bus is an added advantage.
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Questions?
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