Sequence control from SCADA in SCADA systems - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start the sequence when the start button is pressed.

SCADA systems

if start_button.[1]():
    sequence.start()

Drag options to blanks, or click blank then click option'

Astop

Breset

Cis_pressed

Dactivate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'stop' or 'reset' instead of checking if pressed.

The method is_pressed() checks if the start button is currently pressed, triggering the sequence start.

2fill in blank

medium

Complete the code to pause the sequence when the pause command is received.

SCADA systems

if command == '[1]':
    sequence.pause()

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Astart

Bstop

Creset

Dpause

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'stop' or 'reset' instead of 'pause'.

The command to pause the sequence is 'pause', which triggers the pause method.

3fill in blank

hard

Fix the error in the code to correctly check if the sequence is running.

SCADA systems

if sequence.[1]() == True:
    print('Sequence is running')

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Ais_running()

Brunning()

Crun()

Dstart()

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'running()' which may not exist, or 'start()' which starts the sequence.

The method is_running() returns a boolean indicating if the sequence is active.

4fill in blank

hard

Fill both blanks to create a loop that waits until the sequence is complete.

SCADA systems

while sequence.[1]():
    time.[2](1)

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Ais_running

Bsleep

Cwait

Dstop

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'wait' instead of 'sleep' or 'stop' instead of 'is_running'.

The loop continues while sequence.is_running() returns true, pausing 1 second each cycle with time.sleep(1).

5fill in blank

hard

Fill all three blanks to log the sequence status with timestamp.

SCADA systems

log_entry = f"{time.[1]()} - Sequence status: {sequence.[2]()}"
logger.[3](log_entry)

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Actime

Bis_running

Cinfo

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' instead of 'is_running', or 'logger.start' which does not exist.

time.ctime() gives the current time as a string, sequence.is_running() returns status, and logger.info() logs the message.