Control Network Specifications > DeltaV Controller Firewall > DeltaV Firewall IPD Network Examples

DeltaV Firewall IPD with Multiple Controllers

A firewall IPD supports a maximum of eight controllers.

Figure: Firewall IPD with Eight Controllers


The following figure shows firewall IPDs in a network with more than eight controllers. Add firewall IPDs to share the communications load if the number of controllers requiring protection exceeds eight.

Figure: Firewall IPDs with more than Eight Controllers


The information in the following table applies to both the primary and secondary connections between all components.

100 m (max) straight-through Category 5e Screened Twisted Pair (ScTP) 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 switch to which the controller is connected. Build this cable assembly with a shielded, metal-enclosed RJ45 connector on both ends.
100 m (max) straight-through ScTP 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 mini-switch and not on the firewall IPD port.
100 m (max) straight-through ScTP 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 rack room switch and not on the firewall IPD port.
100 m (max) straight-through ScTP 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 rack room switch and not on the workstation.
Attach a separate ground wire to the front panel screw that is labeled with the ground symbol and connect this wire to a suitable instrumentation ground.