101
6
F
2
S
0
8
3
4
In the dual redundant communication system, if the transmission delay time of CH1 is large
without reference to that of CH2, the carrier tripping time at the remote terminal is delay.
2.5.1.2 Transmission Data
The following data are transmitted to the remote terminal via the 64kb/s digital link:
Positive sequence current
Positive sequence voltage
User programmable 14 commands (sent every 30 electrical degrees)
User programmable 4 commands (sent every power cycle)
Measured value (every one second)
Clock time (every one second)
Sampling synchronization control signal
Current and voltage data are instantaneous values which are sampled every 30 electrical degrees
(12 times per cycle) and consist of eleven data bits and one sign bit. This data is transmitted every
3 samples to the remote terminal.
Other data is transmitted once every power cycle.
The data transmission format is shown in Appendix N.
In addition to the above data, cyclic redundancy check bits and fixed check bits are transmitted to
monitor the communication channel. If a channel failure is detected at the local terminal,
command bits are held to the value before failure.
User programmable commands
Any signals (On/off data) shown in Appendix B can be assigned to COM1-S to COM14-S and
SUB_COM1-S to SUB_COM4-S as user programmable commands by using the PLC function.
The default setting is as follows:
Command Default
Signal No. Signal name
COM1-S 800 C/R_SEND-A
COM2-S 801 C/R_SEND-B
COM3-S 802 C/R_SEND-C
COM4-S 803 C/R_SEND-S
COM5-S 804 C/R_SEND-DEFA
COM6-S 805 C/R_SEND-DEFB
COM7-S 806 C/R_SEND-DEFC
COM8-S 815 C/R_SEND-PSB
COM9-S 516 BI4_COMMAND
COM10-S --
--
COM11-S --
--
COM12-S --
--
COM13-S --
--
COM14-S --
--
SUB_COM1-S --
--
SUB_COM2-S --
--
SUB_COM3-S 848
LOCAL_TEST
SUB_COM4-S 881
SEVERE_CF-L
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