Siemens query: How to identify HMI-PLC communication failure in multiple connections? Thank you, Pavol.
This is my process: I use two internal boolean tags, conn_1_ok and conn_2_ok, and two PLC integer tags, conn_1_moving_banner and conn_2_moving_banner for PLC1 and PLC2 respectively. The tags cycle through values from 0 to 10000 in the PLC programs. When there is a value change on conn_1_moving_banner in the HMI, I set conn_1_ok to 1 (true). Similarly, for conn_2_moving_banner, I set conn_2_ok to 1 (true) on value change. In the event of system Event 140001 (connection disconnected) on the HMI, I set conn_1_ok and conn_2_ok to 0 (false) to indicate the disconnection.
To perform this action, navigate to connections, then area pointer, and finally coordination. Enable the feature and link it to a specific word in a database. Within that word, there is a valuable piece of information that fluctuates - rising for one second and then falling for one second. Keep a close eye on this data for any changes in the CPU. Additionally, there are a few other statuses available for use.
Easily showcase system events on the HMI by inserting a system events banner. This will provide valuable information on disconnections and their locations, as well as other pertinent details.
Rob discussed the concept of monitoring a specific bit within a word to detect changes in CPU usage. This "life bit" fluctuates between high and low states every second. By observing this bit, you can easily determine when a Programmable Logic Controller (PLC) is online. But, how can you identify when a PLC goes offline?
JesperMP mentioned the ability to determine when a Programmable Logic Controller (PLC) is connected. But how can you identify when a PLC is disconnected? Look for system event messages and information indicating the PLC status changing to "offline" on the screen. This can help you monitor the PLC's connectivity status efficiently.
Pavol, there are a few indicators you could look at for identifying HMI-PLC communication failure in a multiple connection system. One method is checking for error lights on your hardware. Alternatively, you could monitor for error messages in HMI displays or even in your PLC programming software. Keep in mind that intermittent errors could be an early indicator of network issues, possibly due to overloaded signal traffic or hardware problems.
Hi Pavol! One effective way to identify HMI-PLC communication failures across multiple connections is to implement a systematic approach using diagnostic tools available within Siemens TIA Portal. Start by checking the status of each connection in the “Online” diagnostics section to see if any connections are marked as broken. It can also be helpful to monitor the error logs for any timeouts or communication interrupts, as they often provide clues about where the issue lies. Additionally, using the SNMP protocol can help you identify network issues if your architecture allows for it. Overall, ensuring that your network settings and IP addresses are correctly configured is vital too!
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Answer: 1. How can I troubleshoot communication failures between an HMI and PLC in multiple connections in TIA Portal? - To troubleshoot communication failures, you can check the network settings, cables, and configurations in TIA Portal to ensure they are correct and consistent.
Answer: - Common reasons for communication failures include incorrect network settings, faulty cables, misconfigured communication parameters in TIA Portal, or issues with the industrial network infrastructure.
Answer: - To prevent communication failures, it is important to follow best practices for network setup, regularly check and maintain cables and connections, ensure proper configuration and addressing in TIA Portal, and monitor network performance for any anomalies.
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