Simatic 7 PLC (CPU 315-2DP) online conflict

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Anonymous

In online mode (CPU 315-DP), big FC networks (with large number of FBD/STL blocks) are only partially coming in online. Whenever open a FC and select online, always upper blocks of the big networks are showing online, where as its lower blocks show offline. Once we click lower block, it will come in online and upper block goes offline. Networks having small blocks have no such problem and they are always coming in online completely.Other unit PLC with simatic-7 (CPU 315). In online mode we are not facing this type of problem and even more than one net works come in online simultaneously. We are using simatic field PG with same setting for both PLC.

PG/PC interface for 315-2DP PLC is CP5611 (MPI)
PG/PC interface for 315 PLC is CP5611 (MPI)
 
Buy more RAM and close down all the unnecessary stuff you have open and you should get a better picture.

Other way is to make a simpler network which is likely to result in cleaner programming which is easier to understand.

Regards
Donald P
 
D

Dobrowolski, Jacek

Hi,

In HWConfig on the properties of S7 CPUs you can select operation mode: TEST or PROCESS. That setting mainly influences way the online view is refreshed. In TEST mode CPU scan time is prolonged to allow transfer all of data needed by online view to display. In PROCESS mode you can define the maximum time allowed by which scan time can be prolonged. If it's not enough to transfer all data needed then not whole online status can be displayed.

Regards,

Jacek Dobrowolski
 
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