This is the Windows app named plcfw whose latest release can be downloaded as plcfw-0.3.tgz. It can be run online in the free hosting provider OnWorks for workstations.
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DESCRIPTIONplcfw is a simple command-line tool to communicate with Siemens S7 PLC using the fetch-write protocol. It can be used to do a single query of one data block item, or to process a list of queries to various data blocks. Refer to Siemens document "FETCH/WRITE service in an S7-300/400 CPU via the integrated Ethernet interface" for details about the protocol specification and configuration on the PLC side.
This is an application that can also be fetched from https://sourceforge.net/projects/plcfw/. It has been hosted in OnWorks in order to be run online in an easiest way from one of our free Operative Systems.