# Calculations on UDT parameters using binding problem **URL:** \ **Category:** Ignition\ **Created:** [March 5, 2024, 2:41pm UTC](https://forum.inductiveautomation.com/t/calculations-on-udt-parameters-using-binding-problem/86828 "2024-03-05T14:41:33Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Michal\_Goralczyk](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/michal_goralczyk/32/55564_2.png) [@Michal\_Goralczyk](https://forum.inductiveautomation.com/u/Michal_Goralczyk)\ **Post date:** [March 5, 2024, 2:41pm UTC](https://forum.inductiveautomation.com/t/calculations-on-udt-parameters-using-binding-problem/86828/1 "2024-03-05T14:41:33Z")
Hello, I have created a UDT that has several parameters by which the appropriate register for modbus addressing in Tag is calculated. When the UDT is used and I create a manual instance, I can see in the path that the address is ok. I tried to generate several instances using wizard but noticed that for the same parameters the address is different. What I mean is that the ending ".0" appears in the path. I have no idea what it is caused by. I have tried several times to create UDT from scratch and trestart the gateway and I don't know why it keeps appearing. Formula; [Driver]HR{TCU\_Data\_reg+18+TCU\_regs\_qty\*(TCU\_number-1)} UDT: ```auto { "name": "UDT_Sample", "parameters": { "TCU_number": { "dataType": "Integer" }, "TCU_LastCom_reg": { "dataType": "Integer", "value": 29500 }, "TCU_Data_reg": { "dataType": "Integer", "value": 30500 }, "Modbus_ID": { "dataType": "Integer", "value": 1 }, "TCU_regs_qty": { "dataType": "Integer", "value": 22 } }, "tagType": "UdtType", "tags": [ { "name": "AI", "tagType": "Folder", "tags": [ { "opcItemPath": { "bindType": "parameter", "binding": "[Driver]HR{TCU_Data_reg+16+TCU_regs_qty*(TCU_number-1)}" }, "valueSource": "opc", "name": "BatteryVoltage", "tagGroup": "Odczyt_10s", "tagType": "AtomicTag", "engUnit": "mV", "opcServer": "Ignition OPC UA Server" }, { "opcItemPath": { "bindType": "parameter", "binding": "[Driver]HR{TCU_Data_reg+18+TCU_regs_qty*(TCU_number-1)}" }, "valueSource": "opc", "name": "BatteryCurrent", "tagGroup": "Odczyt_10s", "tagType": "AtomicTag", "opcServer": "Ignition OPC UA Server" } ] } ] } ``` Tag 1 instance created: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/b/3ba7fec8401ddb64e17737ceff976dab7af87bf5.png) Tag 2 wizard created: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/8/d8a4c3d0e288e3de441920709bffff03d4e792b2.png) I noticed that in the parameters there is a difference involving the separation of thousands I also tried to enter it interchangeably and the result is different again, I do not know why? ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/c/c/cc430ee8de25e8447cf9bcaebbdca16255664c01.png) Greetings Michał ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [March 5, 2024, 3:04pm UTC](https://forum.inductiveautomation.com/t/calculations-on-udt-parameters-using-binding-problem/86828/2 "2024-03-05T15:04:54Z")
How are you creating the instance? Perhaps with `system.tag.configure()` ? If so, you must not include your parameters in the `.configure` operation, but use `system.tag.writeBlocking()` afterwards. `.configure()` screws up parameter overrides, changing their data types. ---
**Author:** ![Michal\_Goralczyk](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/michal_goralczyk/32/55564_2.png) [@Michal\_Goralczyk](https://forum.inductiveautomation.com/u/Michal_Goralczyk)\ **Post date:** [March 6, 2024, 8:20am UTC](https://forum.inductiveautomation.com/t/calculations-on-udt-parameters-using-binding-problem/86828/3 "2024-03-06T08:20:23Z")
I use the simplest ways to create a single instance as well as multiple instances. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/8/6/86ca9b584231659aefcf965c4330216923f80211.png) Regards Michał ---
**Author:** ![Michal\_Goralczyk](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/michal_goralczyk/32/55564_2.png) [@Michal\_Goralczyk](https://forum.inductiveautomation.com/u/Michal_Goralczyk)\ **Post date:** [March 6, 2024, 10:06am UTC](https://forum.inductiveautomation.com/t/calculations-on-udt-parameters-using-binding-problem/86828/4 "2024-03-06T10:06:12Z")
I was discover that UDT instances generated using instance wizard have different type of parameters which may cause the problem. Does anyone know a solution for this? ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/d/ad3a82e1c4031d22a74e1f73fbc66ddd220ee2dd.png) ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [March 6, 2024, 1:08pm UTC](https://forum.inductiveautomation.com/t/calculations-on-udt-parameters-using-binding-problem/86828/5 "2024-03-06T13:08:23Z")
> [@Michal\_Goralczyk](#): > > different type of parameters It's a bug in Ignition. > [@Michal\_Goralczyk](#): > > a solution for this? My prior comment offers a work-around: Use `.configure()` in a script without including parameters. Use `.writeBlocking()` to then set the parameters. ---
**Author:** ![Michal\_Goralczyk](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/michal_goralczyk/32/55564_2.png) [@Michal\_Goralczyk](https://forum.inductiveautomation.com/u/Michal_Goralczyk)\ **Post date:** [March 6, 2024, 1:28pm UTC](https://forum.inductiveautomation.com/t/calculations-on-udt-parameters-using-binding-problem/86828/6 "2024-03-06T13:28:57Z")
Thank you, I will try to do it. I have hundreds of instances so single creation is a torment. Too bad the wizard doesn't work, someone should do something about it. ---
**Author:** ![lrose](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/lrose/32/62724_2.png) [@lrose](https://forum.inductiveautomation.com/u/lrose)\ **Post date:** [March 6, 2024, 1:51pm UTC](https://forum.inductiveautomation.com/t/calculations-on-udt-parameters-using-binding-problem/86828/7 "2024-03-06T13:51:34Z")
> [@Michal\_Goralczyk](#): > > single creation is a torment You can write a script to do the creation for you. ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [March 6, 2024, 2:04pm UTC](https://forum.inductiveautomation.com/t/calculations-on-udt-parameters-using-binding-problem/86828/8 "2024-03-06T14:04:16Z")
The wizard's patterns are so limited that I can't remember it **ever** suiting my needs, buggy or not. ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [March 6, 2024, 5:03pm UTC](https://forum.inductiveautomation.com/t/calculations-on-udt-parameters-using-binding-problem/86828/9 "2024-03-06T17:03:09Z")
Good news: We're very close to finishing up a revamp of the multi-instance wizard that dramatically increases its flexibility. Will be an 8.3 feature, but it should be a lot more useful.