Posted 23 April Good day all, i need advice for Modbus TCP configuration on mitsubishi iQ-R PLC. I have 4 PLC iQ-R R08P CPUs with the configuration as shown in the picture. PLC 1,2,3 communicate with the master PLC using simple CPU Read/Write communication. from the master PLC, all tags on PLC 1,2,3 are configured to be modbus TCP with the RJ71EN71 module. The problem I am facing is how do I get the communication status of each PLC to the master PLC with simple CPU communication. I want to display the communication results of each PLC as a tag on modbus TCP. Thank you very much Share this post Link to post Share on other sites
Posted 23 April Look like you have all the communication running right ? So you question is where you can find the status of simple PLC comms ? 1 person likes this Share this post Link to post Share on other sites
Posted 23 April Since the master PLC is actually a modbus slave, and you want that slave to also respond to your monitoring, you will likely need to write a regularly changing value from each slave PLC to separate registers in the master PLC (heartbeat signals). Then have code in the master PLC that will time out if a given slave's heartbeat stops changing. Place the booleans for that status in other modbus addresses that the monitoring system can see. (Or, perhaps, have the monitoring system watch the same heartbeat values.) 1 person likes this Share this post Link to post Share on other sites
Posted 23 April 6 hours ago, Gambit said: Look like you have all the communication running right ? So you question is where you can find the status of simple PLC comms ? That's right, I want to know the communication status of the master PLC with PLC 1,2,3. is that possible? Share this post Link to post Share on other sites
Posted 23 April 1 hour ago, pturmel said: Since the master PLC is actually a modbus slave, and you want that slave to also respond to your monitoring, you will likely need to write a regularly changing value from each slave PLC to separate registers in the master PLC (heartbeat signals). Then have code in the master PLC that will time out if a given slave's heartbeat stops changing. Place the booleans for that status in other modbus addresses that the monitoring system can see. (Or, perhaps, have the monitoring system watch the same heartbeat values.) Does the heartbeat function have to be created manually? Or is there a separate library from Mitsubishi Electric? Share this post Link to post Share on other sites
Posted 23 April (edited) 15 minutes ago, Yahya said: That's right, I want to know the communication status of the master PLC with PLC 1,2,3. is that possible? Have a look op PAGE ID : SH081257ENG-8C2 of the e-manual viewer. Checking the simple CPU communication status. Edited 23 April by Gambit 1 person likes this Share this post Link to post Share on other sites
Posted 23 April (edited) 1 hour ago, Gambit said: Have a look op PAGE ID : SH081257ENG-8C2 of the e-manual viewer. Checking the simple CPU communication status. I can't find the document in the e-manual Edited 23 April by Yahya Share this post Link to post Share on other sites
Posted 23 April 6 hours ago, Yahya said: heartbeat function have to be created manually? I would make it precisely to fit my needs. Maybe Mitsu has something built-in, but I'm not a Mitsu expert. 1 person likes this Share this post Link to post Share on other sites
Posted 24 April 7 hours ago, pturmel said: I would make it precisely to fit my needs. Maybe Mitsu has something built-in, but I'm not a Mitsu expert. Thank you for advice Sir Share this post Link to post Share on other sites
Posted 24 April (edited) 15 hours ago, Yahya said: I can't find the document in the e-manual That's not how you search. Download the latest manuals if needed. Then patse SH081257ENG-8C2 in the search bar but change the [ALL] button into See attached doc e-Manual Viewer Page ID and KB Doc ID Guide.PDF Edited 24 April by Gambit Share this post Link to post Share on other sites
Posted 24 April 12 hours ago, Gambit said: That's not how you search. Download the latest manuals if needed. Then patse SH081257ENG-8C2 in the search bar but change the [ALL] button into See attached doc e-Manual Viewer Page ID and KB Doc ID Guide.PDF thank you, my problem has been resolved Share this post Link to post Share on other sites