Control loop monitoring in SCADA systems - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read the current value of the control loop sensor.

SCADA systems

current_value = sensor.read_[1]()

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Atemperature

Bvalue

Cstatus

Doutput

Attempts:

3 left

💡 Hint

Common Mistakes

Using read_status() instead of read_value().

The read_value() method returns the current sensor reading.

2fill in blank

medium

Complete the code to check if the control loop is within the acceptable range.

SCADA systems

if [1] >= loop.min_limit and [1] <= loop.max_limit:
    status = 'OK'

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Acurrent_value

Bsensor.value

Cloop.current

Dloop.output

Attempts:

3 left

💡 Hint

Common Mistakes

Using loop.current which may not exist.

We compare the current_value against the loop limits to check status.

3fill in blank

hard

Fix the error in the code to log an alert when the control loop is out of range.

SCADA systems

if current_value [1] loop.max_limit:
    logger.alert('Control loop out of range')

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A<=

B==

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= which triggers alert incorrectly.

The alert triggers when the value is greater than the maximum limit.

4fill in blank

hard

Fill both blanks to calculate the error between setpoint and current value.

SCADA systems

error = [1] - [2]

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Aloop.setpoint

Bcurrent_value

Cloop.output

Dsensor.read_value()

Attempts:

3 left

💡 Hint

Common Mistakes

Using output instead of setpoint for error calculation.

The error is the difference between the setpoint and the current sensor value.

5fill in blank

hard

Fill all three blanks to create a dictionary of loop status with keys: 'error', 'status', and 'value'.

SCADA systems

loop_status = {'error': [1], 'status': [2], 'value': [3]

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Aerror

Bstatus

Ccurrent_value

Dloop.setpoint

Attempts:

3 left

💡 Hint

Common Mistakes

Putting variable names as strings instead of variables.

The dictionary keys map to the variables holding error, status, and current value.