Real-time data display in SCADA systems - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

Output of SCADA data polling command

What is the output of the following SCADA polling command when the sensor returns a temperature of 75.3°F?

SCADA systems

scada_poll --sensor temp_sensor_1 --format json

A {"sensor":"temp_sensor_1","value":"75.3","unit":"C"}

B Error: Sensor not found

C {"sensor":"temp_sensor_1","value":75.3,"unit":"F"}

D {"sensor":"temp_sensor_1","value":75,"unit":"F"}

💡 Hint

Check the unit and data type returned by the sensor.

The command returns a JSON object with the sensor name, numeric value 75.3, and unit Fahrenheit (F). Option C has wrong unit C, C is an error, D truncates the value.

❓ Configuration

intermediate

Configuring data refresh rate in SCADA system

Which configuration snippet correctly sets the data refresh rate to 5 seconds in a SCADA system config file?

A refresh_rate=5000ms

B refresh_rate=5sec

C refresh_rate=5

D refresh_rate=5s

💡 Hint

Milliseconds are often used for precise timing in configs.

Option A correctly uses 5000ms (5 seconds) which is the expected format. A and B use unsupported units, C lacks units.

❓ Troubleshoot

advanced

Troubleshooting delayed data updates

A SCADA dashboard shows data updates every 30 seconds despite the config set to 5 seconds. What is the most likely cause?

A Dashboard cache not refreshing properly

B Network latency causing delayed data transmission

C Sensor hardware malfunction

D Incorrect sensor ID in config

💡 Hint

Consider what controls how often the dashboard refreshes data display.

Dashboard caching can cause stale data to show despite frequent polling. Network latency or sensor issues would cause errors or missing data, not consistent delay.

🔀 Workflow

advanced

Steps to enable real-time alarm notifications

What is the correct order of steps to enable real-time alarm notifications in a SCADA system?

A 1,2,4,3

B 2,1,4,3

C 1,4,2,3

D 1,2,3,4

💡 Hint

Think about configuring first, then enabling services, testing last, and deploying changes.

First set thresholds, then enable notifications, test triggers, and finally deploy changes. Other orders miss logical flow.

✅ Best Practice

expert

Best practice for secure real-time data display

Which practice best secures real-time data display in SCADA systems?

A Allow anonymous access for faster data retrieval

B Use encrypted communication channels and role-based access control

C Store all data locally without backups

D Disable logging to improve performance

💡 Hint

Security involves protecting data in transit and controlling user permissions.

Encrypted channels protect data from interception; role-based access limits who can see data. Other options reduce security or reliability.