GE C30 Instruction Manual page 183

5 SETTINGS
Figure 5–15: DUAL-CHANNEL CLOSED LOOP (DUAL-RING) CONFIGURATION
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:
DIRECT I/O CH2 RING CONFIGURATION:
For UR-series IED 2:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O CH1 RING CONFIGURATION:
DIRECT I/O CH2 RING CONFIGURATION:
For UR-series IED 3:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O CH1 RING CONFIGURATION:
DIRECT I/O CH2 RING CONFIGURATION:
In this configuration the following delivery times are expected (at 128 kbps) if both the rings are healthy:
IED 1 to IED 2: 0.2 of power system cycle;
IED 1 to IED 3: 0.2 of power system cycle;
IED 2 to IED 3: 0.2 of power system cycle.
The two communications configurations could be applied to both permissive and blocking schemes. Speed, reliability and
cost should be taken into account when selecting the required architecture.
b) CRC ALARM CH1(2)

PATH: SETTINGS PRODUCT SETUP
 CRC ALARM CH1

MESSAGE
MESSAGE
MESSAGE
The C30 checks integrity of the incoming direct input and output messages using a 32-bit CRC. The CRC alarm function is
available for monitoring the communication medium noise by tracking the rate of messages failing the CRC check. The
monitoring function counts all incoming messages, including messages that failed the CRC check. A separate counter adds
up messages that failed the CRC check. When the failed CRC counter reaches the user-defined level specified by the
setting within the user-defined message count
ALARM CH1 THRESHOLD
FlexLogic™ operand is set.
When the total message counter reaches the user-defined maximum specified by the
ting, both the counters reset and the monitoring process is restarted.
GE Multilin
TX2 TX1
UR IED 1
RX1 RX2
TX1
UR IED 3
RX2
"1"
"Yes"
"Yes"
"1"
"Yes"
"Yes"
"1"
"Yes"
"Yes"
 
DIRECT I/O CRC ALARM CH1(2)
CRC ALARM CH1
FUNCTION: Disabled
CRC ALARM CH1
MESSAGE COUNT: 600
CRC ALARM CH1
THRESHOLD: 10
CRC ALARM CH1
EVENTS: Disabled
C30 Controller System
RX1 RX2
UR IED 2
TX2 TX1
RX1
TX2
842715A1.CDR
Range: Enabled, Disabled
Range: 100 to 10000 in steps of 1
Range: 1 to 1000 in steps of 1
Range: Enabled, Disabled
, the
CRC ALARM 1 CH1 COUNT
CRC ALARM CH1 MESSAGE COUNT
5.2 PRODUCT SETUP
5
CRC
DIR IO CH1 CRC ALARM
set-
5-59