I’ve never used Modbus before. So I appreciate any help I can get. I’ve tried a myriad of different connection address mappings and usually get something like the following back.
E [d.M.ReadHoldingRegistersRequest] [13:14:40]: Uncaught Throwable handling response. key=java.lang.Object@61545f1b, req=[ ], rsp=[ 00 03 03 FF 00 03 F5 2E ] device-name=Test Device Scanner
INFO | jvm 1 | 2019/09/12 08:14:40 | java.lang.ArrayIndexOutOfBoundsException: Index 3 out of bounds for length 3
INFO | jvm 1 | 2019/09/12 08:14:40 | at com.inductiveautomation.xopc.driver.util.OldByteUtilities.getInt(OldByteUtilities.java:126)
INFO | jvm 1 | 2019/09/12 08:14:40 | at com.inductiveautomation.xopc.driver.util.UAByteUtilities.getInt32(UAByteUtilities.java:155)
Easiest way to get started is to forget the mapping for now and just go into the designer and make a single tag with an OPC Item Path of “[DeviceName]HR1” or whatever Holding Register offset you want to get data from.
It also looks like you may have chosen the “Modbus RTU over TCP” driver instead of just the Modbus TCP driver. Or perhaps the device is actually RTU over TCP and you do need to choose that driver.
Hi @wking for future reference, documents like this can be found in the MyCognex portal for customers.
You can register products, download manuals, get support documentation, and contact our support team. Happy to see you’ve already connected successfully though!
I am trying to connect to my dataman 363 using Ignition Modbus TCP, but I haven’t been able to figure it out how. Can you show what addressing you used ?
