Direct Input/Output Communications; Description - GE UR F35 Series Instruction Manual

Multiple feeder protection system
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3 HARDWARE

3.3 DIRECT INPUT/OUTPUT COMMUNICATIONS

3.3DIRECT INPUT/OUTPUT COMMUNICATIONS

3.3.1 DESCRIPTION

The direct inputs and outputs feature makes use of the type 7 series of communications modules, which allow direct mes-
saging between UR devices. These communications modules are outlined in the table later in this section.
The communications channels are normally connected in a ring configuration as shown in the following figure. The trans-
mitter of one module is connected to the receiver of the next module. The transmitter of this second module is then con-
nected to the receiver of the next module in the ring. This is continued to form a communications ring. The figure illustrates
a ring of four UR-series relays with the following connections: UR1-Tx to UR2-Rx, UR2-Tx to UR3-Rx, UR3-Tx to UR4-Rx,
and UR4-Tx to UR1-Rx. A maximum of 16 UR-series relays can be connected in a single ring
3
Figure 3–26: DIRECT INPUT AND OUTPUT SINGLE CHANNEL CONNECTION
The interconnection for dual-channel type 7 communications modules is shown as follows. Two channel modules allow for
a redundant ring configuration. That is, two rings can be created to provide an additional independent data path. The
required connections are: UR1-Tx1 to UR2-Rx1, UR2-Tx1 to UR3-Rx1, UR3-Tx1 to UR4-Rx1, and UR4-Tx1 to UR1-Rx1
for the first ring; and UR1-Tx2 to UR4-Rx2, UR4-Tx2 to UR3-Rx2, UR3-Tx2 to UR2-Rx2, and UR2-Tx2 to UR1-Rx2 for the
second ring.
Figure 3–27: DIRECT INPUT AND OUTPUT DUAL CHANNEL CONNECTION
The following diagram shows the connection for three UR-series relays using two independent communication channels.
UR1 and UR3 have single type 7 communication modules; UR2 has a dual-channel module. The two communication chan-
nels can be of different types, depending on the type 7 modules used. To allow the direct input and output data to cross-
over from channel 1 to channel 2 on UR2, the
setting should be "Enabled" on UR2. This
DIRECT I/O CHANNEL CROSSOVER
forces UR2 to forward messages received on Rx1 out Tx2, and messages received on Rx2 out Tx1.
GE Multilin
F35 Multiple Feeder Protection System
3-27

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