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Entry type: Application example, Entry ID: 21690362, Entry date: 01/21/2014
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Micro Automation: Simple networking and cascading of drives (MAS 26)

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  • Associated product(s)

Note
The SIMATIC S7-200 components used in this application example are currently phased out.
This application can be realized even more effective and easier with the new SIMATIC S7-1200. The respective application example with SIMATIC S7-1200 is available under entry-ID: 37604154
Furthermore, many useful applications with SIMATIC S7-1200 are available under entry-ID: 35923253

Automation task
A water user shall be supplied with water on demand via four pumps.
Four induction motors drive one pump each. Assuming an output of 100% for each pump, an output of 400% is to be generated by cascading all four pumps.
By switching pumps on an equal load for all pumps shall be ensured taking into consideration the operating times. The pumping output of a pump which has been released for maintenance shall be automatically taken over by a pump with free capacity.
Apart from the above described automatic operation, it shall also be possible to operate each pump manually.
In order to take into consideration the various pump types, it shall be possible to operate all pumps in positive and negative direction.
The plant shall be operated via a monochrome Touch-Panel


Figure 01

Automation solution 
The 4 induction motors are controlled with one SINAMICS G110 type frequency converter each.
In order to minimize the wiring expenses between controller S7-200, CPU 224XP, and the frequency converter, the SINAMICS G110 with integrated bus interface (RS485 with USS protocol) was selected as a frequency converter. This enables controlling all 4 frequency converters via the internal interface of the S7 200 CPU.
The compact controller S7- 200, CPU 224 XP is configured via the programming user interface STEP7 MicroWIN V4.0 SP6, which enables including an USS library for simple controlling of the frequency converter.
Touch-panel TP 177micro represents the user interface for the operator. WinCC flexible 2007 is used as a configuration tool.


Figure 02

Startup Code
For the startup we offer you software examples with test code and test parameters as download. The software examples support you during the first steps and tests with your Micro Automation Sets. They enable quick testing of hardware and software interfaces between the products described in the Micro Automation Sets.

Downloads

Download contents

Download

Flyer
Micro Application Example Set26_DocTech_v2d0_en.pdf ( 1741 KB )
Startup Code V2.0 (STEP 7-Micro/WIN Project) Set26_S7-200_V2d0_en.zip ( 28 KB )
Startup Code V2.0 (WinCC flexible Project) Set26_WinCCflex_V2d0_en.zip ( 2311 KB )

Links

Link contents

Link

S7-200 system manual System manual
WinCC flexible manual Manual

History

  • Improved control algorithm to run pumps synchronized.
  • Monitoring of operating hours and maintanance features implemented

Security information
Siemens provides products and solutions with industrial security functions that support the secure operation of plants, solutions, machines, equipment and/or networks. They are important components in a holistic industrial security concept. With this in mind, Siemens’ products and solutions undergo continuous development. Siemens recommends strongly that you regularly check for product updates.

For the secure operation of Siemens products and solutions, it is necessary to take suitable preventive action (e.g. cell protection concept) and integrate each component into a holistic, state-of-the-art industrial security concept. Third-party products that may be in use should also be considered. For more information about industrial security, visit
http://www.siemens.com/industrialsecurity.

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http://support.automation.siemens.com.

Security information
In order to protect plants, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about industrial security, please visit
http://www.siemens.com/industrialsecurity.
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