GE B30 Instruction Manual page 85

3 HARDWARE
The interconnection for dual-channel Type 7 communications modules is shown below. 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 3–33: 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
forces UR2 to forward messages received on Rx1 out Tx2, and messages received on Rx2 out Tx1.
Figure 3–34: DIRECT INPUT AND OUTPUT SINGLE/DUAL CHANNEL COMBINATION CONNECTION
The interconnection requirements are described in further detail in this section for each specific variation of type 7 commu-
nications module. These modules are listed in the following table. All fiber modules use ST type connectors.
Not all the direct input and output communications modules may be applicable to the B30 relay. Only the modules
specified in the order codes are available as direct input and output communications modules.
NOTE
GE Multilin
3.3 DIRECT INPUT AND OUTPUT COMMUNICATIONS
Tx1
Rx1
UR #1
Tx2
Rx2
Tx1
Rx1
UR #2
Tx2
Rx2
Tx1
Rx1
UR #3
Tx2
Rx2
Tx1
Rx1
UR #4
Tx2
Rx2
842007A1.CDR
DIRECT I/O CHANNEL CROSSOVER
Tx
UR #1
Rx
Channel #1
Tx1
Rx1
UR #2
Tx2
Rx2
Channel #2
Tx
UR #3
Rx
842013A1.CDR
B30 Bus Differential System
setting should be "Enabled" on UR2. This
3
3-33