Modbus problems


Recommended Posts


I have a problem with modbus RTU communication in DaqFactory. The problem is that i sometimes have failure on connection because i have 100 tags on modbus RTU.

Do i have to limit the speed of communication or something like that ?



Link to comment
Share on other sites

No there is no limit, though under versions 5.40 and earlier there was some code that could slow it down. So, first, upgrade to the latest version by downloading from our website. Then, look at the monitor and see how long it takes to send and receive a response. Next, you should try and put your tags in consecutive order so DAQFactory can retrieve the values with the minimum number of calls. If, for example, you want to read tags 1,2 and 3, DAQFactory can make a single call. If you want tags 1, 5 and 8, DAQFactory has to make three separate calls.

Link to comment
Share on other sites


This topic is now archived and is closed to further replies.