IGCAR : Annual Report - Indira Gandhi Centre for Atomic Research

IGC
Annual Report 2007
Fig.2 Photograph of the DAS
dynamically as per the user
needs. All the Input /Output
cards and network are
configurable. One year data
and events are stored with
mirroring for archival and
retrieval. Hard copy of current
alarm signals, events and all
displays are provided. On line
help is available for overall
guidance.
fiber optic Ethernet Local Area
Network (LAN) with TCP.
Network printer is used for
printing the alarm signals,
events and displays. A
dedicated printer is also
provided for printing the events
as and when they occur.
DAS consists of in-house
designed and developed
68020 based CPU card,
analog & digital input cards as
in Fig. 2.
Software
The complete software of the
OIS consists of four modules as
follows.
Embedded Software
Communication
Software
Data management with
storage and retrieval
Data Presentation with
Human Machine
Interface (HMI)
Embedded software which is
running in DAS is written as per
MISRA C guidelines and fused
in EPROM. The main functions
of DAS are scanning the input
signals at regular intervals,
packet formation, sending the
packets to all PDS connected in
the LAN and configuring the
I.O and network cards.
Communication software
provides communication
between DAS and PDS by TCP.
Data management module
receives and validates the data
and then processes the data to
engineering unit. One-year
data and events are stored with
mirroring for fault tolerance
which is used for analysis.
Architecture of OIS
The architecture of the OIS is
shown in Fig 1.It is a physically
and logically distributed system
with real time computer, based
on VME bus for data
acquisition and PC based
systems called as Process
Display Stations (PDS) for
display as well as storage. Data
Acquisition System (DAS) is
located in local control room
whereas PDS are located in the
main control room and all the
systems are interconnected by
Fig.3 Mimic diagram
136 ENABLING TECHNOLOGIES