SCADA Monitoring Systems
SCADA stands for
Supervisory
Control
And
Data
Acquisition and is also referred to as position monitoring system. This system follows the movements of the loading arm(s) with sensors and records and visualises these on screen with data and actual times. These sensors are mounted on the loading arm(s) and measure the rotation of the loading arm, the angles between pedestal and inner-arm and angle between inner-arm and outer-arm.
These input data can be recorded on hard-disk or CD and can be used as evidence against incorrect operation when and where needed.
On the screen of the PC the actual status of the loading arm is shown, though only if also the electric/hydraulic control system is being activated. If applicable, more marine loading arms can be shown simultaneously (2 or 4) on the same screen.
The SCADA system operates completely independent from the ERS (emergence release system). This means that if the SCADA system is out of operation, the ERS is still operational, because the ERS is controlled by the PLC and not by the SCADA system.
All parameters for alarms, ERS and operation etc. give input to the PLC and not the SCADA.
The program is built up with software in which the loading arm(s) on the jetty are represented graphically. All dimensions of the loading arm(s), jetty, fenders, operation area etc. including their relations are programmed in the system. That is why a realistic on screen display is possible with real time position of the loading arm(s) in relation to its working envelope. This is shown in both side- and top views. Two angle rotating measuring devices per loading arm generate the data of movements of inner and outer arm and one linear measuring device generate the data of movement of rotation/slewing.
Data displayed on screen:
- The operating area cross hatched rectangles
- The warning and alarm areas in orange and red
- The Apex and rotation settings in degrees and percentage of the operation range used of its total limits
- Actual position of the loading arm connection flange in X (from fender),Y (from water level), Z ((slew right) distances in mm
- Applicable alarms at the bottom will display in red when activated (on the jetty head console the audible and visual alarms will be activated accordingly)
- On screen buttons at the top for quick view of History and Trend of operation of one MLA (or more MLA’s where applicable).
- With short intervals, information of the loading arms position are recalculated and visualised accordingly to create dynamic display.
On screen buttons for choosing actual time, previous day, start of day (00.00hr), Back (from 5 to 3600seconds) Forward (from 5 to 3600seconds), end of day.