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CPU928A REPLACED WITH CPU928B

Created by: saathiksyed at: 10/11/2009 11:04 AM (6 Replies)

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10/11/2009 11:04 AM	Rate (0)
saathiksyed Posts: 36 Rating: (0)	Dear S5 experts, We have CPU 928A with Siemens order No 6ES5928-3UA12, in one of our bag welding machine. This CPU 928A is defective, we have CPU 928B with Siemens order No 6ES5928-3UB12. Is it possble directly replacing CPU928A with CPU 928B?. I have EPROM in CPU 928A, can I insert in CPU 928B and make cold reset?. Kindly help me to solv this issue.
saathiksyed Posts: 36 Rating: (0)	Last edited by: saathiksyed at: 10/11/2009 11:05 AM
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10/11/2009 11:33 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 11/18/2024 Posts: 3027 Rating: (1057)	Hello saathiksyed the short answer is: YES More info is available in this FAQ: Replacing a CPU 928A with a CPU 928B I hope this helps
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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10/11/2009 11:51 AM	Rate (0)
saathiksyed Posts: 36 Rating: (0)	Thanks fritz, Can you give me further detail, Is it possible directly inserting CPU928A EPROM in CPU928B and make cold reset, and the CPU928B can work as CPU 928A
saathiksyed Posts: 36 Rating: (0)
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10/11/2009 12:28 PM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 11/18/2024 Posts: 3027 Rating: (1057)	Hello again saathiksyed that is another short answer YES from me. Note though that your current DB' values will be reset to the values as stored on the EPROM (one can only assume that thedesigner/programmer has taken this into account when he decided to supply the CPU with an EPROM instead of RAM module). I hope this helps
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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10/11/2009 2:04 PM	Rate (0)
saathiksyed Posts: 36 Rating: (0)	Dear fritz, Thanks again for your prompt reply. Please clarify me, I have one more doubt. The CPU 928B have RAM modul, CPU 928A have EPROM modul. Shall I put EPROM modul inplace of RAM modul and make cold reset.
saathiksyed Posts: 36 Rating: (0)
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10/12/2009 8:46 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 11/18/2024 Posts: 3027 Rating: (1057)	saathiksyed Please clarify me, I have one more doubt. The CPU 928B have RAM modul, CPU 928A have EPROM modul. Shall I put EPROM modul inplace of RAM modul and make cold reset. Either way is fine dear saathiksyed, this is your call (you can operate your 928 with a RAM module OR EPROM module). Advantage of using a RAM module in your 928 is: You can easilychange the logic "on the fly" in the PLC. Disadvantage of using a RAM module in your 928 is: Youdo require/rely on a backup battery to keep your program in the CPU in case of power failures. Advantage of using an EPROMmodule in your 928is: You do NOT rely on a battery backup You prohibit people from being able to easilychange the logic "on the fly" in the PLC. Disadvantage of using an EPROMmodule in your 928is: Any required program change require erasing and burning of the EPROM. My advise, if you were happy with EPROM usage inyour (now faulty)928A thus far, you should simply reuse it your 928B. Below are two manuals whichhave more on that subject and are generally handy to have in your case: SIMATIC S5-135U/155U System Manual S5-135U CPU 928B Programming Guide I hope this helps
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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10/12/2009 12:48 PM	Rate (0)
saathiksyed Posts: 36 Rating: (0)	Thanks fritz for your guidance. I will try EPROM modul in CPU 928B.
saathiksyed Posts: 36 Rating: (0)
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