I would like to ask everyone why a laptop does not need a CP5611 to connect to a PLC?
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This post was last edited by windsorwin1 on 2015-10-13 at 18:18. Can the 5611 in a desktop be connected to DP ports or MPI ports arbitrarily? Can a laptop with built-in RS232 only be connected to an MPI port? Does the PC-Adapter include the 5611’s MPI connection functionality?
This generally depends on the communication protocol you need; an RS232 port cannot be used to connect to MPI, and the communication interface settings are made in PC/PG
What protocol is used for the RS232 connection from that notebook to the PLC?
It depends on what CPU it is communicating with; for Siemens systems, it’s always RS485. You can purchase a USB-PPI or USB-MPI programming cable, or one that is original from Siemens – those suitable for series 200, 300, 400, etc
This post was last edited by windsorwin1 on 2015-10-13 at 20:34. It was indeed observed on site that a laptop with an RS232 port was communicating with the PLC – how is this done? If it’s not the MPI protocol, what protocol is being used?
If you use an adapter, you don’t need the 5611.
CP5611 can connect to both MPI and DP ports. RS232 is a physical interface protocol; if you need to connect to a PLC, the traditional programming cable is one that converts RS232 to MPI. Later, as technology advanced, basic laptops no longer came equipped with serial ports; therefore, Siemens introduced PC ADAPTERS with USB ports.
Is the 5611 hardly used these days?
This post was last edited by dennyshen2549 on 2015-10-14 20:03. MPI is an RS485 interface; the protocol is specific to Siemens and is confidential! Sure, an adapter is used to convert the communication protocol; otherwise, communication won’t be possible. It’s not the case that just because it has an RS458 port, communication will work automatically
485 is more common, while 232 is less so; it’s best to use an official USB converter cable. Or buy a computer with a PC card slot, and use a PC card to add a 485 interface.