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Siemens company finished the production of S5 controllers in years 2003-2005 (details in attachment link). However, this type of controlling is still in use in machines and production lines in our country.
This is because of the fact that the old technologies (15,20 years old and even older ones) are imported to Poland from the Western Europe. INEE, as the company servicing Simatic S5 controllers, has got many calls for their breakdowns. According to our experience we can say that after so many years of control system's exploitation it is possible that every component can be damaged. We often hear such a statement: “How come it could have broken? It has been working properly for twenty years!”.
Elements of S5 system before migration 
- Complex exchange – contains, apart from exchanging S5 controller to S7, exchanging of NN equipment, safety system modernization and carrying out a new electrical diagram.
- Partial exchange- exchanging the whole S5 controller to S7 or exchanging only entry/exit to S7 etc. and the rest at later time.
Generally we recommend the complex exchange, we can guarantee then reliable work of the whole system, total cost of realization is lower too, however the main advantage of the partial exchange is spreading the costs in time.
Usually at this moment we can ask a question: “How much does it cost?”, “How can we justify that the exchange is necessary?”, “How should we charge payback?” and so on.
 Elements of S7 system after migration.
Convincing arguments which we can use are: cease production of S5, no support from Siemens company for S5 series or support for additional cost, very high prices for new interchangeable parts, used parts with a short guarantee etc.
Below table shows prices for some S5 parts and S7 counterparts:
| S5 element | Price of a new part
(12 months warranty) | Price of a used part
(2 months warranty)
| Counterpart / Substitute S7 | Price of a new part
(12 months warranty) |
Central unit CPU944
6ES5944-7UB21 |
7 355,00 € |
1 600,00 € |
Central unit CPU315-2DP
6ES7315-2AG10-0AB0 |
1 324,00 € |
| Analog inputs module 8xAI 6ES5460-7LA13 |
2 121,00 € |
1 100,00 € |
Analog inputs module 8xAI 6ES7331-1KF01-0AB0 |
377,00 € |
Power supply for Rack 3[A]
6ES5951-7LB21 |
749,00 € |
450,00 € |
Power supply 5[A]
6ES7307-1EA00-0AA0 |
130,00 € |
Profibus DP
IM-308 C
6ES5308-3UC21 |
1 660,00 € |
1 350,00 € |
Driven by CPU
(item 1) |
0,00 € |
The buying cost of interchangeable parts S5 in extreme cases can overrun the cost of migration from S5 to S7.
We are waiting for your contact, we will make an offer for migration and we can also help to justify and calculate the payback.
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+48 (32) 235 45 60 / FAX +48 (32) 235 45 67 
+48 505 104 251 
Pilchowice / Gliwice woj. Śląskie