Introduction

Add an independent DIO network if you have existing distributed equipment—which you may not want to reconfigure—to the M580 system for the purpose of communicating with the control network.

An independent DIO network is not part of the Ethernet RIO network, but it does communicate with the control network.

An independent DIO network is an Ethernet-based network that includes distributed equipment on a copper wire that runs from a single port connection. If you use dual-port equipment that supports RSTP, you can connect the equipment in a daisy chain loop to the device network ports on the BMENOC0301/BMENOC0311 Ethernet communication module.

Considerations:

  • There is no backplane connection to the RIO network.

  • A BMENOC0301/BMENOC0311 Ethernet communication module communicates with a BMENOC0321 control network module on the local rack to support communication with the M580 control network only. The Ethernet backplane port on the BMENOC0301/BMENOC0311 module is disabled so that it does not communicate with the CPU and the RIO network through the backplane. Instead, the front Ethernet ports of the two modules are interlinked.

Example

This graphic shows an independent DIO network. The BMENOC0301/BMENOC0311 module is interlinked with a a BMENOC0321 control network module on the local rack. The Ethernet backplane port of the BMENOC0301/BMENOC0311 module is disabled so that the independent DIO network communicates with the control network only, not the device network:

1 The M580 CPU connects RIO drops and distributed equipment to the main ring.

2 A BMENOC0301/BMENOC0311 Ethernet communication module on the local rack is connected to the independent DIO network.

3 A BMENOC0321 control network module on the local rack connects an independent DIO network to the M580 control network. This module also provides transparency between the device network and the control network.

4 A BMENOS0300 network option switch module on an RIO drop connects a DIO sub-ring to the main ring.

5 A BMENOS0300 network option switch module on an RIO drop connects a DIO cloud to the main ring.