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+--- Thread: Modbus timeout operation (/showthread.php?tid=670)
Modbus timeout operation - PassivPluss - 11.03.2017
Hi
I suddenly get modbus operation timed out. Earlier it came occationaly but now it stopped and gives error log, so no modbus communicatiin in a month. Any ideas?
RE: Modbus timeout operation - PassivPluss - 15.03.2017
How to troubleshoot this. I am using the latest firmware.
RE: Modbus timeout operation - admin - 15.03.2017
Can you check if the port is working and cabling is ok? Timeout means that there's no communication between LM and ModBus devices.
RE: Modbus timeout operation - Habib - 15.03.2017
is that a different case then mine?
http://forum.logicmachine.net/showthread.php?tid=312
RE: Modbus timeout operation - admin - 16.03.2017
Your error log message was not really an issue
And it only affected TCP, not RTU.
RE: Modbus timeout operation - PassivPluss - 16.03.2017
Cable is ok. I had just two slaves, but tried to disconnect one. That means only 1 slave with 1m cable. How to check port?
RE: Modbus timeout operation - Morpheus09 - 20.06.2017
I have the same problem, with the UIO20 side by side to the LogicMachine, it does not respond either the RTU scan or the RTU read test, same with other modbus devices,
in other LogicMachines I have tried it and same thing happens, all of them are running 20170601 firmware
RE: Modbus timeout operation - admin - 20.06.2017
Have you done the address programming for it?
RE: Modbus timeout operation - Morpheus09 - 20.06.2017
(20.06.2017, 08:49)admin Wrote: Have you done the address programming for it?
the address programming for the devices, yes, they were working well
RE: Modbus timeout operation - admin - 20.06.2017
Then it means that modbus is working. If you change serial port settings (baud rate / parity / stop bits), you have to do the addressing again, otherwise UIO20 will still be using old settings.
RE: Modbus timeout operation - Morpheus09 - 19.07.2017
(20.06.2017, 09:40)admin Wrote: Then it means that modbus is working. If you change serial port settings (baud rate / parity / stop bits), you have to do the addressing again, otherwise UIO20 will still be using old settings.
I was wrong.. the Write Address is not working either, its like the Modbus is not working at all...
RE: Modbus timeout operation - admin - 19.07.2017
It's possible that RS485 port is damaged, you should also check if the wiring is ok.
RE: Modbus timeout operation - PassivPluss - 09.10.2017
Hi
Now i got modbus timeout on another project with 2 rtu slaves and 2 tcp slaves. Much communication goes without erroes but sometimes there comes error messages in log.
Running a spacelynk on this project. Any ideas how to find out why? Modbus mapper user with profiles
RE: Modbus timeout operation - PassivPluss - 09.10.2017
I just logged in. The fault is only on the RTU devices. And as you can se there is no logic in when the error comes
RE: Modbus timeout operation - stavros - 19.12.2017
I have the same problem. Operation timed out.
As for the baud rate, addresses and cables i am sure that everything is ok because before LM i had another modbus master (txi2.open) and everything was ok.
How i can change the scan delay time or the telegram delay?
Thank you in advance
RE: Modbus timeout operation - admin - 19.12.2017
Upgrade firmware to 2017.06