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+--- Thread: How to "Monitor Modbus" and find (/showthread.php?tid=1260)
How to "Monitor Modbus" and find - buuuudzik - 28.02.2018
Hello,
I have on my installation 6 devices which are connected to LM4(this is the main task of this device) on 2 ports(1st and 2nd).
Both works with such parameters:
Baud rate: 9600,
Parity: None (1 stop bit)
Duplex: Half-duplex
1st port: 3 x Array PLC, 2 x PEGO Humidifier
2nd port: 1 x F&F LE-03MQ
1st port is used by Modbus mapper and I have on it 5 devices with 16 x coils, 10 x int32 and 88 x int16. Every device has minimum interval 10s. With 3 devices(addresses from 1-3) which every has few registers there is very, very rarely timeout error but normally they are working without any issue. But if it is next devices(humidifiers with addresses 4, 5) I see no errors in Error logs and when I use Read test there is absolutely no error, no timeout and responce is logical, same is on first read - every value updates GAs but further is is very, very unreliable. I've tried e.g. change GA value into other (from 8 -> 6) and with or without specified delta to 0.5 or 1 there is no update in 10s or 1 minute but maybe after a lot of minutes or hours or when I disable and enable Modbus mapper or I change some connection params like timeout or Poll interval which probably do the same.
1) What is the registers limit from the baudrate for such parameters? Am I near this limit or very, very far?
2) How can I monitor and find the reason of problem when there are no errors but objects aren't updated every Poll interval?
2nd is used for 1 energy meter and this is other subject and issue because modbus mapper has a lot of errors with this device(also when it is connected by a 0,5 cable, but I can read this device without any issue by ModbusPoll software with PC). But it is open question here:
https://forum.logicmachine.net/showthread.php?tid=1011&highlight=energy+meter
so I've created a separated script for reading a data with more tries for 1 register.
Can somebody help me solve this issue?
I think that it can be connected with this post:
https://forum.logicmachine.net/showthread.php?tid=1193&highlight=modbus+errors