BMENOS0300 in RIO Drop of Hot Standby PACs in support of DIO Clouds

Original instructions

RIO Main Ring with DIO Clouds

In this topology, the BMENOS0300 network option switch is used in an . It is used instead of a BMENOC0301/11 module to reduce cost. Its ports are used as follows:

The two network ports are configured as DIO Ports.

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

CAUTION

RISK OF BROADCAST STORM

Do not connect an Ethernet device in one DIO cloud to an Ethernet device in another DIO cloud. Connecting these devices can result in the occurrence of a broadcast storm, which can overload the network and delay or prevent intended network communications.

Failure to follow these instructions can result in injury or equipment damage.

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 non-looping daisy chain

DIO cloud

Engineering tool resident on PC

NOTE: Because is not enabled, there is no RSTP-based maximum device limit.

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.

(rapid spanning tree protocol) Allows a network design to include spare (redundant) links to provide automatic backup paths if an active link stops working, without the need for loops or manual enabling/disabling of backup links.