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Chapter 12 Enterprise Management System ENTERPRISE MANAGEMENT SYSTEMS (EMS) • EMS is an integrated solution of the tools, technologies and systems to support the various needs of the business, offering an enterprise wide management support. • The following figure shows the systems, which when implemented in an integrated manner for coordinated and cooperative function of the business, give rise to the EMS. DESIGN AND ENGINEERING CAD/CAM CAE ATTENDANCE DATA CAPTURE ELECTRONIC COMMERCE AMS EDI ERP SMS DMS DOCUMENT MANAGEMENT SECURITY CMS COMMUNICATION
ERP: Enterprise Resource Planning Systems. • EDI: Electronic Data Interchange System for commerce, communication and action • CAD/CAM/CAE: Computer Aided Design, Manufacturing and Engineering Systems for Production Management. • AMS: Attendance Management Systems, I.e., employee attendance and presence management for the role management or Data Capture Systems on floors, in stores, at gates, etc. • DMS: Document Management Systems, viz., imaging, copying and text management and dispatching document DBMS. • CMS: Communication Management Systems, such as, paging, cordless, mobile telephone systems and the audio video systems. • SMS: Security Management Systems such as the close circuit television, alarm or warning systems, movement tracing systems, etc. • In the EMS, the ERP system plays the role of front running system. • The major decision making and its execution takes place through ERP. • It is a system of managing all functions of the business with information support coming through the ERP. • It handles the operational systems to run the business and provides the required inputs to planning and control systems handled by the middle management. • The ERP is supported by various other support systems which manage, independently, the specific requirements and simultaneously provide inputs to the ERP.
The Electronic Data Interchange (EDI) System assists the ERP in connecting two systems electronically for E-Mail, Documents Transfer, Data Transfer, etc. • It is designed to handle the commercial functions of the business popularly known as the e-commerce. • It also acts as a gateway to interact with the vendor, the customer, and the other associated institutions of the organizations. • The CAD/CAM/CAE, I.e., the Computer Aided Design / Computer Aided Manufacture / Computer Aided Engineering Systems are the systems which handle design, manufacturing and engineering functions. • It will provide the drawings and design engineering information to the ERP in its execution of manufacturing, purchase and inspection functions. • They are also equipped with the database management facilities and these database act as a back up support to the ERP. • The AMS, I.e., Attendance Management System keeps track of the employee related information for personnel planning, availability and scheduling. • It provides static information about an employee through the human resources management system and the current dynamic information such as his or her presence, shift rotation, the kind of job handled, the cost and so on.
The DMS, I.e., the Document Management System is designed to keep important documents in the database for viewing, sending messages, and for documenting support in the transactions handled. • The system provides text edit facility for document manipulation for the purpose of transaction handling. • In the ERP it is used for cross-checking the key information and also to confirm the authenticity of the transaction. • It handles the document access, editing, copying and mixing the information and sending the information to the various destinations for execution. • It uses scanning, imaging, work flow automation and Document Database Management System. • The CMS or the Communication Management Systems are used for tracking the important resource for action. • These resources are located, altered and advised to act from the location where they are. • Their attention is drawn to an event and advised to act to handle the situation. • The ERP uses the CMS, as a tool, for all its communication needs of recording an event.
The SMS, I.e., the Security Management System handles the security, entry access requirement of the business operations. • It may be a person, a vehicle, or material, its movement, availability and access if tracked, monitored, and guarded for security and safety. • It provides a support to the ERP by clearing the situation to act further. • A truck will not be allowed to enter unless it is an authorized one, and then it will be weighed and its weight will be transferred to the ERP for processing further information. • An employees movement can be restricted or prohibited to select areas before his time is recorded and sent to the ERP for further processing. • These six systems together act as the support systems to the ERP. Each of these systems operate on their native systems and are interfaced to the ERP through the gateway by using a specific software. • The EMS therefore can be defined as a Network System comprising the ERP, the EDI, the CAD / CAM / CAE, the CMS, the SMS, and the DMS.
ERP Architecture • Any information system has three basic components, viz., the Data Management, the Application Logic, and the Presentation. • These components can be built with the client server role definitions. • Since the information needs are dynamically changing, the architecture required is to separate the data and its management from its application. • The user requires the choice of using the data as it suits him the most. Hence the application logic has to be separate from the data. • The architecture could be a two tier or three tier: DATA MANAGEMENT DATA MANAGEMENT DATA SERVER FUNCTION APPLICATION SERVER FUNCTION APPLICATION LOGIC APPLICATION LOGIC PRESENTATION PRESENTATION CLIENT FUNCTION (a) TWO TIER (b) THREE TIER Client/Server Model - Architecture
In a two tier system architecture, the data management is by the server and its processing is through the application logic by client. • In this architecture all the requirements are sent to the server by all users in the network. This affects the load on the server and the response time to the user increases. • There could be a case where the user is dumb and is required to use the system in a guided manner with the ‘help’ assistance. Then the three tier architecture is suitable. • The client uses the GUI tools for simplicity while the application logic is processed on another machine. • The servers play two distinct roles of handling the data and the applications logic. This architecture is useful when there is not much change in the application logic and it is complex. • Further this architecture is useful when the user does not want to change the application logic but may want to change the presentation logic. • The third possibility is a mix of the two architectures. Here the application logic is split into two. • The logic which deals with the data more is attached to the server platform, where the data is being managed. • The logic which deals with the presentation and the specific needs of the user is left to the client platform
Client/Server Model – Architecture. DATA MANAGEMENT SERVER APPLICATION LOGIC APPLICATION LOGIC CLIENT PRESENTATION