SAP R/3 was arranged into distinct functional modules, covering the typical functions in place in an organization. The most widely used modules were Financials and Controlling (FICO), Human Resources (HR), Materials Management (MM), Sales & Distribution (SD), and Production Planning (PP)
Each module handled specific business tasks on its own, but was linked to the others where applicable. For instance, an invoice from the billing transaction of Sales & Distribution would pass through to accounting, where it will appear in accounts receivable and cost of goods sold.
SAP typically focused on best practice methodologies for driving its software processes, but more recently expanded into vertical markets. In these situations, SAP produced specialized modules (referred to as IS or Industry Specific) geared toward a particular market segment, such as utilities or retail.
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Technology
SAP based the architecture of R/3 on a three-tier client/server model.
- Presentation Server
- Application Server
- Database Server
SAP allows the IT supported processing of a multitude of tasks, accruing in a typical company or bank. SAP ERP is differing from R/3 mainly because it is based on SAP NetWeaver: core components can be implemented in ABAP and in Java and new functional areas are mostly not anymore created as part of the previous ERP system, with closely interconnected constituents, but as self-contained components or even systems.
Presentation Server
The presentation server is actually a program named sapgui.exe. It is usually installed on a user's workstation. To start it, the user double-clicks on an icon on the desktop or chooses a menu path. When started, the presentation server displays the R/3 menus within a window. This window is commonly known as the SAPGUI, or the user interface (or simply, the interface). The interface accepts input from the user in the form of keystrokes, mouse-clicks, and function keys, and sends these requests to the application server to be processed. The application server sends the results back to the SAPGUI which then formats the output for display to the user.
Application Server
· An application server is a set of executables that collectively interpret the ABAP/4 programs and manage the input and output for them. When an application server is started, these executables all start at the same time. When an application server is stopped, they all shut down together. The number of processes that start up when you bring up the application server is defined in a single configuration file called the application server profile. Each application server has a profile that specifies its characteristics when it starts up and while it is running. For example, an application sever profile specifies:
· • Number of processes and their types
• Amount of memory each process may use
• Length of time a user is inactive before being automatically logged off.
The application server exists to interpret ABAP/4 programs, and they only run there-the programs do not run on the presentation server. An ABAP/4 program can start an executable on the presentation server, but an ABAP/4 program cannot execute there. If your ABAP/4 program requests information from the database, the application server will format the request and send it to the database server.cvb.