GE T35 Instruction Manual page 111

5 SETTINGS
The
DIRECT I/O CHANNEL CROSSOVER
over messages from Channel 1 to Channel 2. This places all UR IEDs into one direct input/output network regardless of the
physical media of the two communication channels.
The following application examples illustrate the basic concepts for direct input/output configuration. Please refer to the
Inputs/Outputs section in this chapter for information on configuring FlexLogic™ operands (flags, bits) to be exchanged.
EXAMPLE 1: EXTENDING THE INPUT/OUTPUT CAPABILITIES OF A UR-SERIES RELAY
Consider an application that requires additional quantities of digital inputs and/or output contacts and/or lines of program-
mable logic that exceed the capabilities of a single UR-series chassis. The problem is solved by adding an extra UR-series
IED, such as the C30, to satisfy the additional input/output and programmable logic requirements. The two IEDs are con-
nected via single-channel digital communication cards as shown in the figure below.
In the above application, the following settings should be applied:
UR IED 1:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O RING CONFIGURATION:
DIRECT I/O DATA RATE:
UR IED 2:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O RING CONFIGURATION:
DIRECT I/O DATA RATE:
The message delivery time is about 0.2 of power cycle in both ways (at 128 kbps); i.e., from Device 1 to Device 2, and from
Device 2 to Device 1. Different communications cards can be selected by the user for this back-to-back connection (fiber,
G.703, or RS422).
EXAMPLE 2: INTERLOCKING BUSBAR PROTECTION
A simple interlocking busbar protection scheme could be accomplished by sending a blocking signal from downstream
devices, say 2, 3, and 4, to the upstream device that monitors a single incomer of the busbar, as shown below.
Figure 5–7: SAMPLE INTERLOCKING BUSBAR PROTECTION SCHEME
For increased reliability, a dual-ring configuration (shown below) is recommended for this application.
GE Multilin
setting applies to T35s with dual-channel communication cards and allows crossing
UR IED 1
UR IED 2
Figure 5–6: INPUT/OUTPUT EXTENSION VIA DIRECT I/OS
"1"
"Yes"
"128 kbps"
"2"
"Yes"
"128 kbps"
UR IED 2 UR IED 3
T35 Transformer Management Relay
TX1
RX1
TX1
RX1
842711A1.CDR
UR IED 1
BLOCK
UR IED 4
842712A1.CDR
5.2 PRODUCT SETUP
5
5-33