Dear all,
I am reading from SMA via Modbus TCP/IP 3 values per 1 min every 4 min. It fails approx 4 - 6 times per 24 hours with the following errors:
15 Dec 04:06:20 - [warn] [modbus-getter:modbusGetSolarkWh] FSM Reset On State QUEUEING
15 Dec 04:06:44 - [warn] [modbus-getter:modbusGetSolarkWh] FSM Reset On State INIT
Anyone having any idea what to do, I do want too avoid loosing the data for the requested read as much as possible.
Are you triggering multiple read requests at the same time, or doing them one after the other. If at the same time then try spacing them out so they do not overlap. Even better is to do them in one read, if the addresses are not far apart.
Data Transfer Interval via the Modbus protocol
For system stability reasons, the time period between data transfers via the Modbus protocol must
be at least ten seconds. No more than five parameters and measured values should be transmitted
per SMA inverter.
Hi,
i query every 5s my 4 SMA inverters since years without problem, In addition, a charging station (called openWB) query the 4 inverters via modbus every few seconds too.
This is my setup and the given alarms, Can I get help by someone to get explained the serial with alarms that I sometime get?
The communication is over Internet and I get 4-5 errors a day (not including what I believe is errors that follows the initial error).
I tried to move the requests to be 40 sec between and asking for one value at a time from the SMA Solar Inverter.
Is there anything I could try out to change to improve and reduce the errors?
I have also S7 communication to 2 different PLC's that hardly never fails or give errors.
Also the S/ communication is spread out to not have a chance to conflict the time when the Modbus requests will occour.
Would be very greateful for inputs, help
This is the Modbus setup I am using as referense to support if someone could explain the behaviour of the errors, based on setup and error timestamps given in earlier attachments