Doc: ps2001-5-1101-001 Rev: R02. 00
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1486357009-URS, URS
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- 4.7.2 Memory capacity
- 58-71 Doc PS Rev Rb Network arrangements
- 4.7.4 Input/output rack arrangements
| 4.7.1 Cycle times (1) The cycle time of a software application is dependent on the complexity of the process control system in question, its size (how many devices and instruments) and on the CPU being used. It may be necessary that larger or more complex system require a more powerful (and faster) CPU. Generally, a control system application developed using this software module library shall have a cycle time of less than 100 ms. To achieve this, a series of metrics shall be included with the documentation to indicate which CPU is best suited to a particular application (this shall be in terms of IO count and a quantifiable measure of the complexity of the application. 4.7.2 Memory capacity (1) The Simatic Controllers all accept memory cards of various sizes, these range from 4 MB to 32 GB, a minimum size of memory card will be specified (this will be sufficient to hold the full contents of the library and all its embedded documentation. (2) A series of metrics shall be included with the documentation to indicate the memory card size best suited to a particular application (this shall be in terms of IO count and a quantifiable measure of the complexity of the application) 58-71 Doc PS Rev Rb Network arrangements (1) The communication network arrangements for CPU to CPU and CPU to supervisory system will be based around Ethernet TCP/IP 17 and will used fixed IP addressing for devices. (2) Remote IO communication will use Profinet 18 networks (Profinet uses ISO industrial Ethernet) or ProfiBus DP 20 networks. 4.7.4 Input/output rack arrangements (1) The control systems will support a central rack 21 equipped with any of the Siemens Simatic ET200MP range of IO modules. (2) The control system will support remote (or distributed) IO racks, these will be either Profinet or ProfiBus based where the application in question has no preference (i.e. there is no specific requirement fora particular type of remote IO, Profinet shall be used. (3) It will be permissible to connect devices directly to Profinet and ProfiBus networks where such devices have the correct form of interface (for example, an inverter with a Profinet interface. 17 TCP/IP Transmission Control Protocol/Internet Protocol — this is the standard arrangement for Ethernet communications (used widely inmost business and office environments. 18 Profinet (Process Field Net) is an Ethernet base communication network suitable for industrial applications, it is used to operate field instruments and devices. ISO (International Standards Organisation) industrial Ethernet is Ethernet communication based on MAC (media access control) addresses (these are hardware addresses built into Ethernet devices, ISO Ethernet is both faster and more secure than TCP/IP Ethernet. 20 ProfiBus DP (Process Field Bus, distributed peripheral) is a serial communication network suitable for industrial applications, it is used to operate field instruments and devices. A central rack is the rack that holds the Controller CPU. Doc PS Rev R 59-71 (4) Remote IO may be of any type produced or supported by Siemens Simatic, the system shall support all the common types of Simatic IO, these being • ET200MP Standard IO high density IO for the S range • ET200M Standard IO high density IO for the S range, can be used as remote IO for the S • ET200SP Low density, high flexibility IO used exclusively as remote IO • ET200iSP Intrinsically safe version of the ET200SP range • ET200PRO Low density IP rated field mounted remote IO for use externally to control panels Download 1.5 Mb. Share with your friends:
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