SYSTEMS SCADA

SYSTEMS SCADA

SCADA stands for Supervisory Control And Data Acquisition. A SCADA system is based on computers that monitor and remotely control a system, process or system with different characteristics. Unlike Distributed Control Systems, the control loop is usually closed by the operator. Distributed Control Systems are characterized by performing control actions automatically. Today it is easy to find a SCADA system performing tasks automatic control in any level, but their main task is monitoring and control by the operator.

APPEARANCE	SCADA
TYPE OF ARCHITECTURE	CENTRAL
PREVAILING RATE CONTROL	Supervisory: control loops closed by the operator. Additionally: sequential and regulatory control.
TYPES OF VARIABLES	decoupled
ACTION AREA	Geographically distributed areas.
UNIT DATA ACQUISITION AND CONTROL	Remote PLC's.
MEDIA	Radio, TV, telephone lines, direct connection, LAN, WAN.
DATABASE	CENTRAL

Communication protocols

There are various communication systems and various protocols for each requirement of the network, but a type of communication that is becoming more important day is the CAN protocol, this system is integrated into many brands and will become mandatory as the communication protocol DIAGNOSIS for emission control ...

CAN or CAN Bus, is short for Controller Area Network is a serial communications bus for control applications in real time, with a communication speed of up to 1 Mbit per second, and has excellent detection and fault isolation. That is, this is the best and latest technology in new vehicles. In fact, several vehicle manufacturers since 2003, including Toyota, Ford, Mazda, Mercedes Benz, BMW and others already have this system installed. OBD 2 and was mandatory for all vehicles since 1996.

This system uses two wires, in which two signals traveling exactly the same amplitude and frequency but inverted completely modules in these pulse voltage identifies the message, but also has options to keep the active network, but one wire failure communication.

For several years, car manufacturers have only had the option to choose from four communication protocols: ISO 9141, J1850PWM, J1850VPW, KWP 2000 / ISO 14230-4. The CAN system gave automakers a new high speed, typically 50 to 100 times faster than the common communication protocols, and reduces the number of connections needed to communicate between systems.