Relationship to other documents

12-71 Doc PS Rev R Figure 1.1 Project documentation and flow-path

Doc PS Rev R 13-71 2. An overview of the Project
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An overview of the Project
The Practical Series Automation Library (PAL) is to be a library of software modules and template modules for the Siemens Simatic S range (and to a lesser extent the S range) of
Programmable Logic Controllers
or PLCs
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The PAL software structure is to be designed such that it is applicable to virtually all industrial applications that can, generally, be controlled by a PLC, typically, this would include the following types of industries (this is not an exhaustive list
• Water and wastewater treatment
• Pharmaceutical and batch production
• Brewing and fermentation
• Chemical manufacturing
• Oil and gas systems
• Power plants
• Food and beverage production Such applications can generally bethought of as processes that operate with a response time of more than 100 ms. I.e. the system would not be expected to respond to some stimuli faster than 100 ms. In practice, a Controller may (and usually will) respond faster than this however, a response time of 100 ms is considered to bean acceptable limit for PLC control. The Siemens Simatic Sand S range of Controllers are, what would be generally understood to be, program logic controllers (PLCs); Controller is simply the common term used within Siemens literature for this type of device. For clarity, where a Siemens Controller is being referred to, the word Controller is capitalised (to indicate it is a Siemens Controller, rather than some nonspecific controlling device.