23-07-2012, 11:26 AM
AUTOMATION
AUTOMATION.ppt (Size: 753.5 KB / Downloads: 35)
AUTOMATION-DEFINATION
Delegation of human control function to technical equipments
to increase production
to reduce cost
to reduce manpower
to improve safety working conditions
to reduce power consumption
to improve quality
ROLE OF COMPUTERS
When an automated machine is placed under the control of a computer a large number of operations can be performed. The computer can analyze a vast number of sensory inputs from a system and decide which of many responses it should make.
WHAT IS SCADA
SCADA stands for Supervisory Control And Data Acquisition.
SCADA refers to a system that collects data from various sensors at a factory, plant or in other remote locations and then sends this data to a central computer which then manages and controls the data.
WHAT IS DATA ACQUISITION
Data acquisition is the process of retrieving control information from the equipment which is out of order or may lead to some problem or when decisions are need to be taken according to the situation in the equipment. So this acquisition is done by continuous monitoring of the equipment to which it is employed. The data accessed are then forwarded onto a telemetry system ready for transfer to the different sites.
SUBSYSTEMS OF SCADA SYSTEM
Human-Machine Interface is the apparatus which presents process data to a human operator, and through this, the human operator monitors and controls the process.
Remote Terminal Units connecting to sensors in the process, converting sensor signals to digital data and sending digital data to the supervisory system.
Programmable Logic Controller used as field devices because they are more economical, versatile, flexible, and configurable than special-purpose RTUs.
Communication infrastructure connecting the supervisory system to the Remote Terminal Units
ALARMS
have a very critical role in automation. Generally we have alarm states for each inputs/outputs. . Most of the SCADA software support four types of alarms like LOLO,LO,HI and HIHI.
RECIPE MANAGEMENT
When you have different products to manufacture, you just have to load the recipe of the particular product.
SECURITY
You can allocate certain facilities or features to the operator, process people, engineering dept and maintenance dept.
DEVICE CONNECTIVITY
SCADA software should have connectivity to the different hardware used in automation.
USEFULNESS OF SCADA
Production department
Quality department
Maintenance department
Enterprise information
Engineering department
Manufacturing department
GENERAL TERMINOLOGY
TAG
ANALOG TAGS
DISCRETE TAGS
SYSTEM TAGS
STRING TAGS
TOUCH PUSH BUTTONS
COLOUR LINKS
VISIBILITY
BLINK
ORIENTATION
DISABLE
VALUE DISPLAY LINK
PERCENTAGE FILL
APPLICATION SCRIPT
WINDOW SCRIPT
KEY SCRIPT
CONDITION SCRIPT
APPLICATION SECURITY
WHAT IS INTOUCH
Wonder ware In Touch provides a single integrated view of all your controls and information resources. In touch enables engineers, supervisors, operators and managers to view and interact with the working of entire operation through graphical representations of their production processes.
WONDERWARE SCADA SOFTWARE
Easy-to-use, easy to implement
Easy configuration, simplified maintenance
High security and availability
Virtually unlimited scalability
PRACTICAL USES OF SCADA
SCADA used as a control mechanism for chemical plants, electricity generation, electric power transmission, electricity distribution, district heating.
Control mechanisms are described in Process Control.
BENEFITS OF SCADA
Long distance monitoring
Long distance training
Protection against terrorism/vandalism-alarm
Data management (engineering and operations)
Automated operations with real time control
CONCLUSION
SCADA is a control system with
● More interfaces and efficient storage
● More record or device oriented configuration
● But system wide configuration tools are needed
● Are less expensive than DCS, but offer different functionality than DCS
● And finally various applications