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S5 CPU Type

Created by: mvmccowan at: 7/23/2013 3:09 PM (5 Replies)

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7/23/2013 3:09 PM	Rate (0)
mvmccowan Posts: 3 Rating: (0)	We have an S5 - 928B that intermittently goes into the stop mode. We are trying to add OB170 to the code so we can capture what is happening. The documentation states the 928B is capable of using OB170. But when we try to insert it into the code, we get an error message cannot use this block. This suggests to me that the program was compiled for a 945 not a 928. How do you change the CPU type with Simatic S5 v7.12?
mvmccowan Posts: 3 Rating: (0)
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7/23/2013 7:52 PM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	What you like to do is not possible. What information you find in USTACK?
IBN-Service Posts: 8946 Rating: (1000)
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7/23/2013 9:54 PM	Rate (0)
mvmccowan Posts: 3 Rating: (0)	I undrstand that the information I need is in the USTACK. But the issue I have is that when I am on the rig the system works with no stops. When I leave they get the stops. The people on the rig will not take the time to look at the USTACK before reseting the system. At that point the information is gone. So I need a method to move the information to a data block so I can view it later. One method is to use OB170 which is the BSTACK read. If I use the BSTACK read I can see which blocks were called before the system went to stop. The issue I have is how does Simatic S5 determine which CPU is being used if there is no place to enter the CPU type or part number. These CPUs support different functions so how will the software know which functions to support? I have found under COM DB1 the CPU order number. If I change this number will it support different functions?
mvmccowan Posts: 3 Rating: (0)
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7/24/2013 6:06 AM	Rate (1)
Navnag Platinum Expert Joined: 11/21/2007 Last visit: 7/25/2025 Posts: 2326 Rating: (309)	mvmccowan I undrstand that the information I need is in the USTACK. But the issue I have is that when I am on the rig the system works with no stops. When I leave they get the stops. The people on the rig will not take the time to look at the USTACK before reseting the system. At that point the information is gone. So I need a method to move the information to a data block so I can view it later. One method is to use OB170 which is the BSTACK read. If I use the BSTACK read I can see which blocks were called before the system went to stop. The issue I have is how does Simatic S5 determine which CPU is being used if there is no place to enter the CPU type or part number. These CPUs support different functions so how will the software know which functions to support? I have found under COM DB1 the CPU order number. If I change this number will it support different functions? Hi mvmccowan First of all a few observations : a) S5 program is not "COMPILED" before downloading to the CPU and no CPU type is programmed in the S5 program ( There is no hardware configuration as in S7 ) b) the DB1 ( In CPU 928B ) is used to define the following in the S5 program : Digital Input addresses , DIgital Output addresses, IPC Input / output Flag ares ( For Multiprocessing ) and Timer Range. It is not used to define the CPU Type. The CPU Type selection in COM-DB1 is selects the correct DB1 structure for the selected CPU. ( E,g. DB1 in S5-100U CPUs is entirely different ) c) What exactly is the error msg that you are getting when trying to download OB 170 to the CPU ? CPU 928B does support the FB 170 as you said. However I doubt this will solve your problem, as someone will have to check the results of FB170 while the CPU is in Stop. It would be mucheasier to check the ISTACK / BSTAK in that case. I would suggest the you use Error handling OBs ( Pl see attachment ) to diagnose the problem. Thas way you can figure out which error handling OB was called before CPU went to STOP. Or you may prevent the PLC from going to STOP in case of certain error ( After ensuring safe operation ) Hope this helps Cheers Navnag Attachment S5_Error_Handling_Using_OBs.pdf (489 Downloads)
	Last edited by: Navnag at: 7/24/2013 6:08 AM Attachment added There is no such thing as the last bug in a program There are no stubborn bugs, There are only stubborn Debuggers.
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7/24/2013 8:47 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	mvmccowan ...The people on the rig will not take the time to look at the USTACK before reseting the system. ... If a PG with S5 Software stays online, it just need a few seconds to call USTACK / BSTACK and do a screenshot. For further infos, look at Navnag's nice post before.
IBN-Service Posts: 8946 Rating: (1000)
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This contribution was helpful to 2 thankful Users Navnag playerslight

7/24/2013 1:39 PM	Rate (0)
mvmccowan Posts: 3 Rating: (0)	Thanks for he information it is very informative. I have taken your suggestion and used some of the other error handling DBs to store some system information in a DB. This should provide some insight into what is causing the intermittent stops.
mvmccowan Posts: 3 Rating: (0)
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This contribution was helpful to 2 thankful Users Navnag O_Moderator

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