Posted 17 Nov 2021 Hi, i have this NX1P2 cpu with 2 CIF105's. On one of them i have 6 modbus sensors, i talk to each and one of them in a cycle. Occationally i get a timeout error on a random device. They are connected via a Murr Elektronik M12 signal-splitter Each sensor is connected by a 5 meter cable from the splitter. The timeout seems to happen to random device at random interval, and it can be really long time between the timeouts. I have looked around in the sysmac project to see if i could change the timout setting to something sligthly higher than current (default?) Is there any timeout defaults that can be changed on modbus timeout? Share this post Link to post Share on other sites
Posted 17 Nov 2021 The option parameter on the Modbus RTU function block contains a timeout variable. Share this post Link to post Share on other sites
Posted 17 Nov 2021 (edited) Almost worked. I delclared a variable as _sSERIAL_SEND_OPTION (According to the help time). TimeOut is not part of this struct. Only sendDelay shows up EDIT: we are using NX_SerialSend NX_SerialRcv NX_SerialBufClear for the modbus. Edited 17 Nov 2021 by Stefan009 Share this post Link to post Share on other sites
Posted 17 Nov 2021 (edited) Well, I see 2 options: 1) Switch to the Modbus function blocks. 2) Monitor the time between a successful NX_SerialSend and something coming into the card's buffer. If the elapsed time is >= a value then assume a timeout. Edited 17 Nov 2021 by photovoltaic Share this post Link to post Share on other sites
Posted 17 Nov 2021 25 minutes ago, photovoltaic said: Well, I see 2 options: 1) Switch to the Modbus function blocks. 2) Monitor the time between a successful NX_SerialSend and something coming into the card's buffer. If the elapsed time is >= a value then assume a timeout. Aa i understood the "other guy" with these units from this manufacturer, it talks modbus-ish, but its on way, so i believe the NX_Send/Recv is the only way to talk to these devices because the send package has to be formatted in a certain way. The Recive option had timeout which i set to 3 seconds instead of default 2(?), and the NX_SerialBufClear default was 2 seconds, changed to 3, lets see if this reduces and/or removes the timeouts since in the logs its often clear or recv that times out. Share this post Link to post Share on other sites