Please install the Device driver before plugging in the S7-PCI315.
With the IBHNet driver Ethernet online access with S7 for Windows® (Kit-Version), S7 for Windows®, STEP7 can be established.
With STEP7 and S7 for Windows® online functions are also possible using the Siemens ISO on TCP (RFC1006) protocol.
S7-PCI315 Communikationdriver, Samples and Documentation