Alarm acknowledgment workflow in SCADA systems - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to acknowledge an alarm by setting its status to acknowledged.

SCADA systems

alarm.status = '[1]'

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Aacknowledged

Bactive

Ccleared

Dpending

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'active' instead of 'acknowledged' keeps the alarm unacknowledged.

Setting the alarm status to acknowledged marks it as recognized by the operator.

2fill in blank

medium

Complete the code to check if an alarm is acknowledged before clearing it.

SCADA systems

if alarm.status == '[1]':
    clear_alarm(alarm)

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Aactive

Bpending

Cacknowledged

Dcleared

Attempts:

3 left

💡 Hint

Common Mistakes

Checking for 'active' status allows clearing unacknowledged alarms.

Only alarms that are acknowledged should be cleared to ensure they were seen.

3fill in blank

hard

Fix the error in the code to update the alarm acknowledgment timestamp correctly.

SCADA systems

alarm.ack_time = datetime.[1]()

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Atoday

Bnow

Cutcnow

Dtime

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'utcnow' records UTC time which may confuse local operators.

The now() method returns the current local date and time, suitable for acknowledgment timestamp.

4fill in blank

hard

Fill both blanks to create a function that acknowledges an alarm and logs the action.

SCADA systems

def acknowledge_alarm(alarm):
    alarm.status = '[1]'
    alarm.ack_time = datetime.[2]()
    log_action('Alarm acknowledged')

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Aacknowledged

Bactive

Cnow

Dutcnow

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'active' status or 'utcnow' time causes incorrect acknowledgment.

The function sets the alarm status to acknowledged and records the current local time with now().

5fill in blank

hard

Fill all three blanks to filter alarms that are active and not yet acknowledged.

SCADA systems

unack_alarms = [alarm for alarm in alarms if alarm.status == '[1]' and not alarm.[2] and alarm.priority [3] 3]

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Aactive

Backnowledged

C<=

Dcleared

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'cleared' status or wrong priority comparison leads to wrong filtering.

This list comprehension selects alarms with status active, that are not acknowledged, and have priority less than or equal to 3.