Architecture

1 Standalone PAC

2 BMENUA0100 with control port disabled

3 X80 Ethernet RIO drop

4 Control network

5 Ethernet RIO main ring

6 OPC UA client (SCADA system)

7 Engineering workstation with single Ethernet connection

8 Distributed equipment

9 BMENOS0300 switch

10 Dual ring switch (DRS)

Description

This architecture provides a connection to a single OPC UA client (a SCADA system) from multiple M580 standalone CPUs. It is a cost-optimized architecture that does not require high availability. This architecture presents a non-isolated flat network, joining together the control network and the Ethernet RIO main ring in a single subnet.

The BMENUA0100 control port is disabled for each standalone PAC. IPv4 Ethernet communication to the BMENUA0100 module is provided over the backplane port. Upstream communication from each PAC to the single SCADA server is accomplished via the CPU service port.

In configuration 1, downstream connectivity from the PAC to the X80 Ethernet RIO drop (4) from the PAC is provided by the CPU dual device network ports. Further downstream connectivity is provided from the CRA service port and a BMENOS0300 switch (9) to distributed Ethernet equipment.

In configuration 2, downstream connectivity is provided by the dual device network ports to distributed Ethernet equipment.

In this flat network design, all network devices – including the CPU, CRAs and the BMENUA0100 – are NTP clients of an NTP server that resides in the control network. As a result, the CPU time and the BMENUA0100 module time are synchronized.

The BMENUA0100 supports applicative time stamping. In this process, time stamping modules record events in their local buffer. These time stamped events are consumed by the application running in the PAC, which converts the raw record data and stores it in a usable format. The formatted records can then be consumed by a supervisory application, such as a SCADA system.