Control Network Specifications > DeltaV Control Networks

Twisted Pair Cascaded Network Using Twisted Pair Switches

Figure: Twisted Pair Cascaded Network Using Cisco 2950 Twisted Pair Switchesapplies to both primary and secondary networks.

Figure: Twisted Pair Cascaded Network Using Cisco 2950 Twisted Pair Switches


Callout Description
100 m (max) crossover cable. Cat. 5(e) Screened Twisted Pair crossover cable (transmit and receive) is required between switches.
To prevent ground loops, build this cable assembly with a shielded, metal-enclosed RJ45 connector on one end and an isolated, plastic-enclosed RJ45 connector on the other end. The metal connector end of this cable assembly/link can be placed on either switch.
100 m (max) straight-through cable. To prevent ground loops, build this cable assembly with a shielded, metal-enclosed RJ45 connector on one end and an isolated, plastic-enclosed RJ45 connector on the other end. The metal connector end of this cable assembly/link must be placed on the switch and not on the PC.
100 m (max) straight-through cable. The shield on the controller's RJ45 connector connects only to a Faraday cage in the controller; not to the controller's DC ground. Therefore, the RJ45 connectors are floating and the single point of ground is made at the hub or switch to which the controller is connected. Build this cable assembly with a shielded, metal-enclosed RJ45 connector on both ends .
If switch management is to be used over the network via telnet or a web browser, be aware that access privileges and port configuration requirements exist for the twisted pair switch-to-switch links. Refer to Managing Cisco Switches in Books Online for information. for the list of reserved IP addresses that are allowed for switches on DeltaV systems. Refer to the Cisco documentation for web management information. A dedicated non-DeltaV PC is required for switch management.
The Management station has special hardware and software requirements. Refer to the related topics for information on the management station before connecting the station to the DeltaV Control Network.