SCADA applications (water, power, oil and gas) in SCADA systems - Step-by-Step Execution

Process Flow - SCADA applications (water, power, oil and gas)

Sensors collect data

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Data sent to RTU/PLC

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RTU/PLC processes data

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Data sent to SCADA Master Station

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SCADA system displays data

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Operator monitors and controls

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Commands sent back to RTU/PLC

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Actuators adjust physical processes

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Process changes reflected in sensors

↩Loop continues

This flow shows how SCADA systems collect data from sensors, process it, display it to operators, and send control commands back to adjust physical processes continuously.

Execution Sample

SCADA systems

Sensor -> RTU -> SCADA Master -> Operator -> Command -> RTU -> Actuator

This sequence shows the path of data and commands in a SCADA system cycle.

Process Table

Step	Action	Source	Destination	Data/Command	Result
1	Collect data	Water flow sensor	RTU	Flow rate value	Data received by RTU
2	Process data	RTU	SCADA Master Station	Processed flow data	Data displayed on SCADA screen
3	Monitor data	SCADA Master Station	Operator	Flow data visualization	Operator sees current flow rate
4	Send command	Operator	SCADA Master Station	Adjust valve command	Command queued for RTU
5	Transmit command	SCADA Master Station	RTU	Valve adjustment command	RTU receives command
6	Execute command	RTU	Valve actuator	Open valve 10%	Valve position changed
7	Update sensor	Valve actuator	Water flow sensor	New flow rate	Sensor detects updated flow
8	Loop back	Water flow sensor	RTU	Updated flow rate	Cycle repeats with new data
9	End	-	-	-	Continuous monitoring and control ongoing

💡 SCADA systems run continuously; this table shows one full cycle of data collection and control.

Status Tracker

Variable	Start	After Step 1	After Step 2	After Step 4	After Step 6	After Step 7	Final
Flow rate	N/A	100 L/s	100 L/s	100 L/s	110 L/s	110 L/s	110 L/s
Valve position	Closed	Closed	Closed	Command to open 10%	10% open	10% open	10% open
Command status	None	None	None	Adjust valve 10%	Executed	Executed	Executed

Key Moments - 3 Insights

Why does the flow rate variable update only after the actuator changes the valve?

Because the sensor measures the physical process, the flow rate changes only after the valve actuator adjusts the valve (see execution_table steps 6 and 7).

How does the operator's command reach the physical valve?

The command flows from the operator to the SCADA Master Station, then to the RTU, which controls the valve actuator (see execution_table steps 4, 5, and 6).

Why is the SCADA system described as a continuous loop?

Because sensors constantly send updated data, and operators can send commands anytime, creating an ongoing cycle of monitoring and control (see concept_flow and execution_table step 8).

Visual Quiz - 3 Questions

Look at the execution_table at step 6. What happens to the valve position?

A Valve closes completely

B Valve opens 10%

C Valve opens 50%

D Valve remains closed

💡 Hint

Check the 'Result' column at step 6 in the execution_table.

At which step does the operator first see the flow rate data?

A Step 5

B Step 1

C Step 3

D Step 7

💡 Hint

Look at the 'Destination' and 'Result' columns to find when data reaches the operator.

If the sensor fails to send data at step 1, what happens next?

A SCADA Master Station displays no new data

B Operator sends commands anyway

C RTU processes old data

D Valve actuator adjusts automatically

💡 Hint

Consider the data flow from sensor to SCADA Master Station in the execution_table.

Concept Snapshot

SCADA systems collect data from sensors via RTUs/PLCs,
process and display it at a central station,
allow operators to send control commands,
which RTUs execute on actuators,
creating a continuous monitoring and control loop.

Full Transcript

SCADA applications in water, power, and oil and gas industries work by collecting data from sensors that monitor physical processes like flow or pressure. This data is sent to Remote Terminal Units (RTUs) or Programmable Logic Controllers (PLCs) which process it and forward it to a central SCADA Master Station. Operators view this data on screens and can send commands to adjust equipment. These commands travel back through the SCADA system to RTUs, which control actuators to change valves or switches. The physical changes affect the process, which sensors detect again, continuing the cycle. This loop ensures continuous monitoring and control of critical infrastructure systems.