BMENOS0300 in RIO Drop of Hot Standby PACs in support of RIO Sub-Ring

Original instructions

RIO Main Ring with RIO Sub-Ring

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

The two network ports are configured for an RIO Ring.
The service port 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.

Primary Hot Standby PAC

Standby Hot Standby PAC

Hot Standby communication link

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 maximum combined size of the RIO main ring plus a single RIO sub-ring is 32 switched devices, including:

both Hot Standby CPUs
the remote adapter (BMECRA312•0)
the embedded switch in the Ethernet rack on which the BMENOS0300 is installed
the BMENOS0300
up to 27 additional switched devices

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.

A Hot Standby system uses a primary PAC (PLC) and a standby PAC. The two PAC racks have identical hardware and software configurations. The standby PAC monitors the current system status of the primary PAC. If the primary PAC becomes inoperable, high-availability control is maintained when the standby PAC takes control of the system.

One of the three types of RIO modules in an Ethernet RIO network. An RIO drop is an M580 rack of I/O modules that are connected to an Ethernet RIO network and managed by an Ethernet RIO adapter module. A drop can be a single rack or a main rack with an extended rack.

A group of distributed equipment that is not required to support RSTP. DIO clouds require only a single (non-ring) copper wire connection. They can be connected to some of the copper ports on DRSs, or they can be connected directly to the CPU or Ethernet communications modules in the local rack. DIO clouds cannot be connected to sub-rings.