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Terminal A
GRL100
TX1
RX1
CH1
CK1
TX2
RX2
CH2
CK2
Figure 2.2.13.4 Communication Circuit Setup for Three-terminal Applications
Terminal A
GRL100
TX1
RX1
CH1
CK1
TX2
RX2
CH2
CK2
Note: The corresponding channels are connected to each other.
Figure 2.2.13.5 Dual Communication Mode
2.2.13.4 Telecommunication Channel Monitoring
If a failure occurs or noise causes a disturbance in the telecommunication channel, this may
interrupt the data transmission or generate erroneous data, thus causing the relay to operate
incorrectly.
The GRL100 detects data failures by performing a cyclic redundancy check and a fixed bit check
on the data. The checks are carried out for every sample.
If the failure lasts for ten seconds, a communication failure alarm is issued.
The output blocking ceases instantly when the failure recovers.
TX1
TX2
RX1
RX2
CK1
CK2
CH1
CH2
GRL100
34
6 F 2 S 0 8 5 0
Terminal B
GRL100
TX2
RX2
CH2
CK2
TX1
CH1
RX1
CK1
Terminal C
Terminal B
GRL100
TX1
RX1
CH1
CK1
TX2
RX2
CH2
CK2
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