Modbus Tcp/ip configuration for Immr relay

[MrBong]

I have M580 and i m trying to communicate Immr relay with modbus tcp/ip. I have use Addmx block with Read_var and write_var block.i am getting ping of my device but in program it not getting refresh after 1-2 times.

[dnordenberg1]

Show us your code and maybe someone can help you figure it out. But the first thing that comes to my mind is if you set a timeout in the GEST variable? The third INT in a 1..4 array should be set to 10 for example for 1000ms timeout. And don't forget to save this array in a %MW so it retains its value or make sure this third INT is set at at least each PLC start.

[MrBong]

I have also set the timeout from 50 to 100, But same issue comes. After few minutes its unable to read the feedback and it doesn't not change. I have to download the project again and then it works for few minutes, then same issue occurs.

[dnordenberg1]

Is the GEST animation from when it has stopped working? A 7 in the second int's least significant byte means "Problem in sending to the destination". I have no idea what could cause that 😞

7424 (bit 0 is not set) also tells us it is not waiting for something which is also a bit strange but that might be that your "round robin" trigger tells it to hold in this exact moment.

Is that first int counting/changing or is it frozen? How is bit 0 in it behaving?

I think I would capture the communication at network level with wireshark to better understand what really happens. I would also try what happens if you change the communication to another device like another PLC to see if it has something to do with this particular device.

[dnordenberg1]

Another thing that comes to my mind, what version is the CPU firmware?

[MrBong]

 Firmware version of CPU - 3.22 

[Hennie_Smith]

Hi, It could be that the relay stops responding. Have you tried poling the same register using a modbus simulator (plenty free ones on the web)? 

With Modbus comms I always start by using a Modbus Simulator from my PC to the device as this eliminates a lot of uncertainties. 

[dnordenberg1]

3.22 skuld be good, last in 3.x line. 4.x is mostly about security/new features so it would probably not help. My bet is that this has something to do with the specific device.

[MrBong]

Yes i have tried from Modscan. But the problem is after timeout when i download the program again, it works till timeout. So i dont think the relay stops responding.

[MrBong]

Which security features need to enable for this?

[dnordenberg1]

Now I don't understand what you mean?

[MrBong]

Is there any features to enable for timeout or anything to check in specific device?

[ciupol]

I would try to change address on the read_var block from 3 to 2 or 4 to eliminate register vs offset address issue.