Overview of Complex Topologies
Original instructions
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Introduction
This topic discusses some of the more common network topologies that use the components of complex M580 network topologies.
Distributed Equipment
The number and location of distributed equipment in the network impact the module choice.
If Distributed Equipment Is ...
Then ...
in an isolated DIO network or cloud: distributed equipment that is not a physical part of the deterministic RIO network
Each BMENOC0301/11 Ethernet communication module can manage up to 128 isolated distributed devices. The number of BMENOC0301/11 modules supported in a local rack is based on the CPU model that you are using.
Refer to the Selecting a CPU for your System topic for details regarding the number of DIO devices a CPU can manage.
in a DIO cloud: distributed equipment that is a physical part of the deterministic RIO network
In addition to a CPU with Ethernet I/O scanner service and BMENOC0301/11 modules on the local rack, you can install one or more BMENOS0300 modules to attach DIO clouds. The distributed equipment cannot be connected directly to the main ring.
A CPU with Ethernet I/O scanner service can manage up to 64 or 128 distributed devices, depending on the CPU you are using
Refer to the Selecting a CPU for your System topic for details regarding the number of DIO devices a CPU can manage.
in an existing (extended) network that you want to communicate with the M580 device network
Confirm that the Ethernet backplane ports of the BMENOC0301/11 and BMENOC0321 modules are enabled. Connect one of the Ethernet ports on the front of one of the BMENOC0301/11 modules to the Service/Extend port of the BMENOC0321 module with an interlink cable. Connect the other Ethernet port on the front of the BMENOC0301/11 module to the existing network.
in an existing (independent) network that you want to communicate with the M580 control network only
Confirm that the Ethernet backplane port of the BMENOC0321 module is enabled. Connect one of the Ethernet ports on the front of one of the BMENOC0301/11 modules to the existing network. Confirm that the Ethernet backplane port of the BMENOC0301/11 module is disabled. Connect the other Ethernet port on the front of the BMENOC0301/11 module to an Ethernet port on the front of the BMENOC0321 module with an interlink cable.
NOTE: An independent network is essentially an isolated network, but it communicates with an M580 control network. It does not communicate with the M580 device network. You can manage only one independent network in an M580 system.
NOTE: A local rack can have a maximum of eight communication modules, depending upon which CPU you choose. Only one of those can be a BMENOC0321 module.
RIO Main Ring and Sub-Ring Design Examples
Given the considerations set forth above, with respect to RIO main and sub-rings, you could construct an M580 network in the following designs, to deploy the maximum number of RIO modules.
Design 1:
Design 2:
Typical Device Network
A device network is an Ethernet RIO network where distributed equipment can be installed on the same network as RIO modules. In this type of network, RIO traffic has higher priority on the network, so it is delivered ahead of DIO traffic, providing deterministic RIO exchanges.
The device network contains a local rack, RIO drops, distributed equipment, BMENOS0300 network option switch modules, dual-ring switches, adapter class devices, and so on. Devices that are connected to this network follow rules that provide RIO determinism.