I have a rather unusual and confusing app in which I need to develop a PC Based HMI in WinCC Flexible to communicate with an S5 155 (948U CPU) via Profibus using an IM 308-C Profibus interface module in the PLC rack and a CP 5611 in the PC. The PLC also has an Interbus Controller and a CP 1430TF ethernet card in it for other functions.
Looking into the WinCC Flexible documentation is appears my four options for HMI development related to I/O area that can be transmitted and received are: tiny, small, middle, big. With "Big" having a limit of 128 Input Bytes and 64 Output Bytes.
I need more tags than this limitation allows. If I have more than this amount of data. Is this a maximum amount of data that can be transmitted per transmission? If I have more tags than this, will it still work and have to make multiple transmissions to exchange the full amount of data? Or will I have to use an OPC server to exchange a larger volume of data?
If anyone has experience with this sort of application, I would greatly appreciate the advice. I have managed to set-up an OPC server following an example from the Siemens Support Site, but I'm not really clear on the procedure to declare tags in the Simatic Net.DP OPC server and manipulate them via the OPC server. The Siemens documentation on the OPC server is not very clear at all, but I'm brand new to the OPC server world, so my ignorance may be a contributing factor also.
Thanks in advance.
Chris
Looking into the WinCC Flexible documentation is appears my four options for HMI development related to I/O area that can be transmitted and received are: tiny, small, middle, big. With "Big" having a limit of 128 Input Bytes and 64 Output Bytes.
I need more tags than this limitation allows. If I have more than this amount of data. Is this a maximum amount of data that can be transmitted per transmission? If I have more tags than this, will it still work and have to make multiple transmissions to exchange the full amount of data? Or will I have to use an OPC server to exchange a larger volume of data?
If anyone has experience with this sort of application, I would greatly appreciate the advice. I have managed to set-up an OPC server following an example from the Siemens Support Site, but I'm not really clear on the procedure to declare tags in the Simatic Net.DP OPC server and manipulate them via the OPC server. The Siemens documentation on the OPC server is not very clear at all, but I'm brand new to the OPC server world, so my ignorance may be a contributing factor also.
Thanks in advance.
Chris