Industrial Automation Telemetry & SCADA systems     A&B (G. Vassiliou) Ltd has a broad engineering experience in the field of Industrial Automation . This refers to hardware as software for: Automation of Factory and Motor Control Centers SCADA systems Telemetry systems PLC Automation; SCADA system example 1; SCADA system example 2; Top
		PLC Automation for a Pumping Station This Pumping station pumps water from a treatment plant to a remote reservoir. The level of the target reservoir is received by a telephone line. Depending on the inlet flow to the pumping station, the level at the source and target reservoirs and the available electrical power, the system starts or stops automatic from one up to four pumps. The pumps starts and stops with closed valves.
PLC Automation; SCADA system example 1; SCADA system example 2; Top   Example of Graphic Supervision of Treatment system with MX-SCADA PLC Automation; SCADA system example 1; SCADA system example 2; Top   SCADA System of a Water Treatment Plant The following SCADA system developed with MING was designed for a Water Treatment Plant. It consists of several Screen Pictures, displaying a part of the Plant’s Process Diagram. The operator can toggle between the Overview Picture and the several Process Sub Pictures by moving the arrow of the mouse at a Diagram block in the Overview Screen and click on it with the left mouse button. By clicking on the Overview button at the Process Sub Picture the operator returns back at the Overview Picture. Fig. 1: Overview Picture   Fig. 2: Process Sub Picture (Service Water Pressure System)   Alarming: The small rectangular space at the bottom of the each screen is reserved for Alarming. If an Alarm occur, the Screen Jumps immediacy to the Picture which visualise the Process Detail where the fault is registrated. For example if the Screen is displaying the Overview Picture and the pressure of the Service Water System becomes very high, the screen jumps to the Service Water Picture. An example of the Screen is shown in fig. 3. fig. 3: High Pressure of Service Water By clicking with the left mouse button on the Alarm text in the Alarming section of the screen, or by pressing the Acknowledge key ‘F2’ the alarm is acknowledged.
By pressing the Alt key and M a small window occur as shown in fig. 5. The operator can choose to enable or disable printing of Alarms; Audible Alarms and/or Disable all Alarms. If it is enabled it becomes red, if it is disabled it turns blue. In the above example the SCADA node is running, Alarming is activated, Audible warning is enabled, printing is disabled. By clicking on a Alarm in the History Log (fig. 7) a individual Alarm can be disabled.	fig. 4: System Mode

The operator can access 10 different Real Time Trend Graphics. By pressing the Cntr key and T, a Trend Graphics menu occur as shown in fig. 6. If the operator clicks with his mouse at second row, the following Screen appear:

fig. 5: Trend Graphics menu.

fig.6: Real Time Trend Graphic   Historical Data Logging: The historical data can be displayed by pressing the Cntr Key and A. The following screen will appear: fig. 7: Historical Data log of Alarms   fig. 8: Historical Data log of Data   By clicking on the 3rd cell down, the operator can toggle between Data logs, Alarm logs and Alarm/Data logs. The Historical Data can be written to a file to be manipulated in another program as for example Excel, or/and to be reset. To do this the operator has to press the Cntr key and F. The following sub-screen appear: fig. 9: Writing logs to a file. In the first cell the file name is given. By clicking on the 2nd, 3rd or 4th cell the Alarm logs, Data logs or both Alarm and Data logs are saved to the file. By pressing the down-left cell, the Historical Data record is reset. After saving the data to a file, it can be accessed by an external program like Excel. Fig. 10 shows an example of a Historical log file opened in Excel: fig. 10: Historical Data Log in Excel Security: To prevent unauthorised access to write and reset of Historical Data, Reset of Totalizators, starting or closing down of the SCADA node etc., Password levels are added. The system can manage up to 5 password levels. These levels can be organised as follow: Assistant operator: Password level 0; starting up of system and access all pictures. Operator: Password level 1: additional closing down of system. Chief operator: Password level 2: additional able to reset Totalizators. Plant Supervisor: Password Level 3: additional able to write/reset log files. If for a action a higher Password Level is required a sub screen will appear as shown down in fig. 11. fig. 11: Password request   An Operator can also pre-enter a higher Password level. This allows him to perform sertan actions without entering every time the password. To do this, the operator has to press the Cntr key and P. The following sub screen appear: fig. 12: Password Level setting. By entering for example the Password for Level 2, every one can now reset totalizators or closing down the system.

PLC Automation; SCADA system example 1; SCADA system example 2; Top

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Last modified by Frits van Rooij on 6/02/99