BMENOS0300 in RIO Drop of Standalone PAC in support of RIO Sub-Ring

Simple RIO Ring

In this topology, the BMENOS0300 network option switch is used in place of an external dual ring switch (DRS) to reduce cost. The BMENOS0300 network option switch resides in an . Its ports are used as follows:

The two network ports are configured for a RIO Ring.
The service port is configured as an Access port, and supports an engineering tool (for example, Control Expert) resident on a PC.

NOTE: Instead of a PC, a DIO cloud could be connected to the service port.

Standalone PAC on local rack

Ethernet RIO main ring

(e)X80 RIO drop

Ethernet RIO sub-ring

Ethernet daisy chain

Engineering tool resident on PC

NOTE:

To achieve desired RSTP-based network response time targets, the longest path that an Ethernet RIO packet would have to travel in the case of a cable break is 32 switched devices, including:

the CPU
the remote adapter (BMECRA312•0)
the embedded switch in the Ethernet rack on which the BMENOS0300 is installed
the BMENOS0300

NOTE: When you set the BMENOS0300 network rotary switch to RIO Ring, configure RSTP bridge identifier priority settings for other devices in the RIO sub-ring to values greater than 0. Refer to the topic Device Rotary Switch Positions for information about the effects of selecting RIO Ring.