GE C70 Instruction Manual page 215

5 SETTINGS
The
DIRECT I/O CHANNEL CROSSOVER
over messages from channel 1 to channel 2. This places all UR-series IEDs into one direct input and output network
regardless of the physical media of the two communication channels.
The following application examples illustrate the basic concepts for direct input and output configuration. See the Inputs
and 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 contact inputs or output contacts or lines of programmable
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 and output and programmable logic requirements. The two IEDs are con-
nected via single-channel digital communication cards as shown in the figure below.
Figure 5–17: INPUT AND OUTPUT EXTENSION VIA DIRECT INPUTS AND OUTPUTS
In the above application, the following settings should be applied. For UR-series IED 1:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O CH1 RING CONFIGURATION:
"128 kbps"
DIRECT I/O DATA RATE:
For UR-series IED 2:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O CH1 RING CONFIGURATION:
"128 kbps"
DIRECT I/O DATA RATE:
The message delivery time is about 0.2 of power cycle in both ways (at 128 kbps); that is, 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 (for
example: 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 5–18: SAMPLE INTERLOCKING BUSBAR PROTECTION SCHEME
For increased reliability, a dual-ring configuration (shown below) is recommended for this application.
GE Multilin
setting applies to C70s with dual-channel communication cards and allows crossing
UR IED 1
UR IED 2
"1"
"Yes"
"2"
"Yes"
UR IED 2 UR IED 3
C70 Capacitor Bank Protection and Control System
TX1
RX1
TX1
RX1
842711A1.CDR
UR IED 1
BLOCK
UR IED 4
842712A1.CDR
5.2 PRODUCT SETUP
5
5-91