Volume 8 – Mechanical and Electrical Services - Malaysia Geoportal

Chapter 10 SCADA AND AUTOMATION SYSTEM
10.4 SCADA SYSTEM NETWORK TOPOLOGY
Fig. 10.2 Drainage And Irrigation SCADA System Network Topology
Basically the system is divided into 3 major Level functional components which are:
a) Level 1 – Core control of the system which involves all the combination of actuator, water
level sensors, controllers and other related instruments to perform as the front end site
control system.
b) Level 2 – Communication medium such as GPRS/GSM/Internet which transfers the data from
Level 1 to the server at Level 3 and exchange some of the others control parameter between
Level 1 and Level 3
c) Level 3 – Server which stores all the data from Level 1, analyses the collected data and
publish them to the public through internet.
10.4.1 Level 1
Level 1 is the front end processing centre which located at site mainly takes care of process control
and process data analysis. Level 1 sometime is regarded as IO server. It consists of process
controller and data processing unit. IO server provides open interface through standard protocol to
the outside world. Through the open standard protocol, transmitting and receiving of data is made
possible in varies communication medium through Level 2 such as GSM, GPRS, 3G and internet.
Operator is able to receive and request for gate information via SMS. The Components of the Level 1
including:
March 2009 10-5