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Wide-Area SCADA

An alternative to Standard Architecture - Multiple Sites. Each site contains a local Gateway, database, projects, and PLCs to provide local control and SCADA functionality. Corporate WAN allows the user of client retargeting to provide secure and seamless access across multiple facilities. Retargeting allows you to switch from one project on one Ignition server to another project on a different Ignition server. Users from one site can have access to projects and resources in other sites. Ignition's built-in security can also control access to these resources at each site, providing visibility to some users, while limiting access to others. 

Each site can use the exact same modules, or pick-and-choose to match their site-specific needs. Think of this architecture as multiple instances of the Standard Architecture all communicating with each other. Ignition's Gateway Network supports distributed services to give access to local collection from anywhere in the network.



Wide Area SCADA - Central Database

Similar in concept to the Wide-Area SCADA above, with a central database located at a completely different location. All sites record their data within a local database, but also forward the data to this central database. Typically this is used when a corporate office needs access to data from each facility, and management at each plant still wants to access local data.

Data from each site can be replicated by a database administrator, duplicate transaction groups that are directed to the central database, or by splitting Tag History


OPC-UA Stand Alone

OPC-UA is a network-based specification, and is ideal for collecting data from remote locations. Ignition can operate as an OPC I/O server with just the OPC-UA Module and UA drivers installed. Other OPC-UA client software can then access the PLC data through Ignition.

This method only exposes data, however, and the Client must then record it if historical data is desired. If the connection goes down, data will not be available. This method offers the lowest cost, and is suited for situations where the data is not highly critical or historical, for example, remote realtime monitoring.

 


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