Doc: ps2001-5-1101-001 Rev: R02. 00
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1486357009-URS, URS
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| 4 Software operational requirements The Practical Series Automation Library (PAL) Project is a library of software modules and templates that are to be made available for the Siemens Simatic S range of Controllers (and to a lesser extent the S range. At its most basic level, the PAL will be a library of software modules that control the fundamental aspects of an industrial plant such modules would for example read the value of an instrument, operate a valve or drive, perform a calculation c. Such software modules are referred to as standard modules, these are fixed modules that perform a particular function and are identical across all software installations. The PAL also contains application specific modules these contain software that is applicable to the plant being controlled they will be written fora particular project and are configured to match the requirements of that project. This section specifies the requirements for the control system software and software library of modules that is to be delivered under this Project. 4.1 Software functions 4.1.1 Target devices and programming applications (1) All software will be developed using the Siemens Simatic TIA Portal programming application. (2) All software will be designed specifically to run on the Simatic S range of Controllers) The software will be written to be compatible with the S range of controllers, however, it is accepted that the S range has reduced capabilities in comparison to the S range and certain, more complex modules, may not be compatible with the S CPUs. Where a module is not compatible with the S series, this will be clearly noted in the module documentation. 34-71 Doc PS Rev Rb Programming languages (1) The software will be written using the ladder logic 6 programming language. It is accepted that there maybe instances where ladder logic is not practical for certain applications (e.g. indirect addressing of data where this is the case, it will be permissible to use structured text (statement list or STL in Siemens terminology) for those aspects of the software that cannot be rendered using ladder logic. (2) Statement list shall be used sparingly and only where absolutely necessary. Statement list must not be used if the same functionality can be achieved using ladder logic. Download 1.5 Mb. Share with your friends:
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