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Troubleshooting Tag Value Sync Issue Between HMI and SCADA Systems in Simatic WinCC 7.5

Question:

I am implementing both Human-Machine Interface (HMI) and Supervisory Control and Data Acquisition (SCADA) systems for my project. The HMI and SCADA both share the same tags. Adjusting the tag value on the HMI reflects the change in the SCADA system. However, when modifying the value using the SCADA system, the HMI values remain unchanged. I am intrigued by this behavior and would appreciate any insights or explanations from anyone familiar with this issue. Thank you in advance for your assistance.

Top Replies

It seems unusual. Does the PLC's value update when changed on the SCADA system? Could it be that the SCADA IO fields, tags, or connections are set as read-only?

However, every time the SCADA screen is refreshed, it resets to the HMI value. This can be a frustrating issue for users who rely on accurate data visualization in their supervisory control and data acquisition system.

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Frequently Asked Questions (FAQ)

FAQ: 1. Why does changing the tag value in the HMI reflect in the SCADA system, but not the other way around in Simatic WinCC 7.5?

Answer: Answer: This behavior could be due to a configuration or synchronization issue between the HMI and SCADA systems. It is essential to ensure that the tag values are properly mapped and synchronized bidirectionally for consistent updates.

FAQ: 2. How can I troubleshoot tag value sync issues between the HMI and SCADA systems in Simatic WinCC 7.5?

Answer: Answer: To troubleshoot such issues, you can start by checking the tag mapping configurations in both systems, verifying communication settings, and ensuring data consistency between the HMI and SCADA. Additionally, reviewing system logs and monitoring data flow can help identify potential issues.

FAQ: 3. What are some common reasons for tag value discrepancies between HMI and SCADA systems in Simatic WinCC 7.5?

Answer: Answer: Tag value sync issues can occur due to misconfigured tag mappings, communication errors, network issues, or synchronization delays between the HMI and SCADA systems. It is essential to review the system configurations and data exchange mechanisms to address such discrepancies.

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