PRS-7910
PRS-7910 25
NOTICE!
It is extremely important that the 120Ω termination resistors are fitted. Failure to do so
will result in an excessive bias voltage that may damage the devices connected to the
bus.
As the field voltage is much higher than that required, CYG SUNRI cannot assume
responsibility for any damage that may occur to a device connected to the network as a
result of incorrect application of this voltage.
Ensure that the field voltage is not being used for other purposes (i.e. powering logic
inputs) as this may cause noise to be passed to the communication network.
9.2.2 Ethernet Interface
This protective device can provide four rear Ethernet interfaces (optional) and they are unattached
each other. Parameters of each Ethernet port can be configured in the menu “Settings→Device
Setup→Comm Settings”.
9.2.2.1 Ethernet Standardized Communication Cable
It is recommended to use twisted screened eight-core cable as the communication cable. A picture
is shown bellow.
Figure 9.2.2 Ethernet communication cable
9.2.2.2 Connections and Topologies
Each equipment is connected with an exchanger via communication cable, and thereby it forms a
star structure network. Dual-network is recommended in order to increase reliability. SCADA is
also connected to the exchanger and will play a role of master station, so the every equipment
which has been connected to the exchanger will play a role of slave unit.
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