Remote Service uses a network that allows devices on Machines to be manipulated by control programs like PC-Anywhere, VNC, Web Browsers, and other software. Some software that can be used in this environment is special purpose software like Siemens Step-7 that is designed for use with Siemens PLCs.  The ei3 Remote Service platform was designed to that each machine device has its own unique address on the machine.  Working within the ei3 Argo platform, each machine device has an address which is completely unique in the Argo network. In the Argo network, the local machine IP addresses are translated using the process of Network Address Translation, or NAT.

Most software has been designed to be completely NAT insensitive and works well when using the Argo Network Address. Other software is very sensitive to the effects of NAT. When the PLC has an Ethernet connection, Simatic Step-7 will try to use the local IP address of the PLC on the machine rather than the Argo IP address, and some Step-7 operations will then fail when using the program with an Argo connection.

Enodia solves this problem by allowing the user to always address the machine device by its local address on the Machine. So, when used in conjunction with an Argo Remote Service session, Enodia transparently transforms the local address of a device on the machine to the Argo address for communication, yet allows the any software that can communicate with a machine device to use the local or real device address for device control, programming, or management.

Because of the interest in using Step-7 over the Argo network, this document focuses on using Enodia with Step-7 and a Siemens Ethernet enabled PLC. However, Enodia can be used with any software that is used to communicate with machine devices.  Enodia is a universal Remote Service Helper.

Please see attached documents containing details about Enodia.

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