If the FPGA – image is flashed and activated in all SIPROTEC 4 devices the devices can be used in the PRP –
network. Switches in the network branch B can be switched ON. Both ports of the module now send equal PRP-
telegrams and receive PRP telegrams from the network. If the network card of your Service PC can receive
oversized PRP – Ethernet frames you can access to the device over Ethernet via A or B-network branch.
Full control over the PRP – network from a Service PC require a special PRP-software driver in the PC which
support sending and receiving PRP – telegrams over two Ethernet interfaces in the PC. Alternative is the use of a
Redbox which is connected to the PRP – network. Non – PRP telegrams of the Service PC are converted into PRP
– telegrams used in the PRP – network. All commissioning programs are available on the Service PC when
connecting to the PRP – net.
Access to one branch of the PRP-network can be done with a PC with a network-card which supports so called
´Jumbo Frames´. This access allows a view to one branch of the PRP-network only. A device which can not be
reached over this branch may be accessible over the other branch.
Figure 4-15 – Service PC connected to a PRP-network via a Redbox
SCF 11/2008 V08.10
