YME Engineering Course

B. SYSTEM OVERVIEW
♦ Node
Node consists of Node Interface Unit (NIU) and Input/Output Units (IOU)
incase of LFCS (for RIO) while the Node consists of Input/Output Units in
case of KFCS (For FIO).
♦ ESB Bus Coupler Unit
The ESB bus coupler unit couples the ESB bus interface card installed in
the FCU to the ESB bus by modulating and demodulating the signals. This
is applicable for Field Control station with FIO (KFCS)
♦ Processor Card
The Processor Card performs calculations and control computation. In
case of redundant CPU models of the LFCS and KFCS, there are two
processor cards. One of the cards is in control status and the other is in
the standby status.
Each of these two processor unit have two processors or the CPU, which
perform the same control computation. A collator compares the
computation results during each computation cycle. If the computation
results from the two CPUs match, the collator determines that the
computation is normal and sends data to locations such as the main
memory and bus interface unit. Because the main memory as an ECC,
transient bit inversion errors occurring in the main memory can be
rectified.
Figure: Pair and Spare function of the CPU Card for LFCS.
YME Training Center
B-13
CS3KR3-ENG 1 ST Edition Jan 2002